Pipes steel water and gas. Steel water and gas pipes GOST 3262 75 what are the diameters

25.11.2019

This standard applies to non-galvanized and galvanized steel welded pipes with threaded or knurled cylindrical threads and without threads used for water and gas pipelines, heating systems, as well as for parts of water and gas pipeline structures.

Designation:	GOST 3262-75*
Russian name:	Pipes steel water and gas. Specifications
Status:	current
Replaces:	GOST 3262-62
Text update date:	01.10.2008
Date added to database:	01.02.2009
Date of entry into force:	01.01.1977
Designed by:	USSR Ministry of Ferrous Metallurgy
Approved:	USSR State Committee for Standards (09/11/1975)
Published:	Standards Publishing House No. 1994

STEEL PIPES

SPECIFICATIONS

GOST 3262-75

STANDARDS PUBLISHING HOUSE

Moscow

STATE STANDARD OF THE UNION OF THE SSR

the dateintroductions 01.01.77

This standard applies to non-galvanized and galvanized steel welded pipes with cut or knurled cylindrical threads and without threads used for water and gas pipelines, heating systems, as well as for parts of water and gas pipeline structures.

1. ASSORTMENT

1.1. Pipes are made according to the dimensions and weight given in Table. one.

At the request of the consumer, light series pipes intended for thread rolling are manufactured according to the mass dimensions given in Table. 2.

(Changed edition, Rev. No. 1 , 3 ).

1.2. The length of the pipe is made from 4 to 12 m:

measured or multiple measured length with an allowance for each cut of 5 mm and a maximum deviation for the entire length plus 10 mm;

unmeasured length.

By agreement between the manufacturer and the consumer, up to 5% of pipes with a length of 1.5 to 4 m are allowed in a batch of off-gauge pipes.

Table 1

Dimensions, mm

Conditional pass	Outside diameter	Pipe Wall Thickness			Weight of 1 m of pipes, kg
Conditional pass	Outside diameter		ordinary	enhanced		ordinary	enhanced

table 2

Dimensions, mm

Conditional pass	Outside diameter	Wall thickness	Weight of 1 m of pipes, kg

Notes:

1. For a thread made by knurling, a reduction in its internal diameter of up to 10% along the entire length of the thread is allowed on the pipe.

2. The mass of 1 m of pipes was calculated with a steel density of 7.85 g / cm 3. Galvanized pipes are 3% heavier than non-galvanized ones.

1.3. Limit deviations in pipe dimensions should not exceed those indicated in Table. 3.

Table 3

Pipe dimensions	Limit deviations for manufacturing precision pipes
		elevated
Outer diameter with nominal bore:
up to 40 mm incl.
	- 0,5
Outer diameter with nominal bore: over 40 mm
	- 1,0
Wall thickness	- 15 %	- 10 %

Notes :

1. The maximum deviation in the plus side along the wall thickness is limited limit deviations mass of pipes.

2. Pipes of the usual manufacturing accuracy are used for water supply, gas pipelines and system heating. Pipes increased accuracy manufacturing is used for parts of water and gas pipeline structures.

1.4. Maximum deviations in the mass of pipes should not exceed + 8%.

At the request of the consumer, the maximum deviations in mass should not exceed:

7.5% - for the party;

10% - for a single pipe.

(Changed edition, Rev. No. 2, 5).

1.5. The curvature of pipes per 1 m of length should not exceed:

2 mm - with nominal bore up to 20 mm inclusive;

1.5 mm - with nominal bore over 20 mm.

1.6. Pipe threads can be long or short. Thread requirements must comply with those specified in Table. 4.

Table4

Conditional passage, mm	Thread length to the run, mm		Conditional passage, mm	Number of threads with conditional passage	Thread length to the run, mm
Conditional passage, mm		short	Conditional passage, mm	Number of threads with conditional passage		short

1.7. Pipes with a nominal bore of 6, 8, 10, 15 and 20 mm are wound into coils at the request of the consumer.

Legend examples

Ordinary pipe, not galvanized, of the usual manufacturing accuracy, random length, with a nominal bore of 20 mm, a wall thickness of 2.8 mm, without thread and without a coupling:

Trumpet 20´ 2.8 GOST 3262-75

The same with the clutch:

Pipe M-20´ 2.8 GOST 3262-75

The same, measured length, threaded:

Pipe R-20´ 2.8 - 4000 GOST 3262-75

The same, zinc coated, random length, threaded:

Pipe Ts-R-20´ 2.8 GOST 3262-75

The same, with zinc coating, measured length, threaded:

Pipe Ts-R-20´ 2.8 - 4000 GOST 3262-75

For pipes for thread rolling, the letter H is indicated after the word "pipe" in the symbol.

For pipes with a long thread, the letter D is indicated after the word "pipe" in the symbol.

For pipes of increased manufacturing accuracy, the letter P is indicated in the symbol after the nominal bore size.

(Revised edition, Rev. No. 1).

2. TECHNICAL REQUIREMENTS

2.1. Pipes are manufactured in accordance with the requirements of this standard and according to technological regulations approved in the prescribed manner, from steels according to GOST 380 and GOST 1050 without standardization of mechanical properties and chemical composition.

Pipes for parts of water supply and gas pipeline structures are made of steel according to GOST 1050.

2.2. At the request of the consumer, the ends of pipes to be welded with a wall thickness of 5 mm or more must be chamfered at an angle of 35-40 ° to the end of the pipe. At the same time, an end ring with a width of 1 - 3 mm should be left.

At the request of the consumer, on ordinary and reinforced pipes with a nominal bore of more than 10 mm, the thread is applied to both ends of the pipe.

2.1; 2.2. (Changed edition, Rev. No. 3, 4).

2.3. At the request of the consumer, the pipes are equipped with couplings made in accordance with GOST8944, GOST8954, GOST8965 and GOST8966 at the rate of one coupling for each pipe.

(Revised edition, Rev. No. 3).

2.4. Cracks, captivity, swelling and sunsets are not allowed on the surface of the pipes.

Laminations are not allowed at the ends of the pipes.

Separate dents, ripples, risks, traces of stripping and other defects due to the production method are allowed, if they do not take the wall thickness beyond the minimum dimensions, as well as a scale layer that does not interfere with inspection.

On pipes made by furnace welding, it is allowed to reduce the outer diameter to 0.5 mm at the weld site if there is a gentle thickening of the inner diameter of not more than 1.0 mm in this place.

(Changed edition, Rev. No. 3, 4).

2.5. At the request of the consumer, on pipes with a nominal bore of 20 mm or more, on the inner surface of the pipe seam, the burr must be cut or flattened, while the height of the burr or its traces should not exceed 0.5 mm.

At the request of the consumer, on pipes with a nominal bore of more than 15 mm, made by the method of furnace welding and the method of hot reduction, a gentle thickening of a height of not more than 0.5 mm is allowed on the inner surface of the pipes in the weld zone.

(Changed edition, Rev. No. 2, 3, 4, 5, 6).

2.6. Pipe ends must be cut square. The value of the bevel of the end is allowed no more than 2 ° . Burr residue must not exceed 0.5 mm. When removing burrs, the formation of blunting (rounding) of the ends is allowed. It is allowed to cut pipes in the line of the mill.

By agreement between the manufacturer and the consumer, burrs up to 1 mm are allowed on pipes with a nominal bore of 6-25 mm, made by furnace welding.

(Changed edition, Rev. No. 4, 6).

2.7. Galvanized pipes must have a continuous zinc coating over the entire surface with a thickness of at least 30 microns. The absence of zinc coating on the ends and threads of pipes is allowed.

On the surface of galvanized pipes, blistering and foreign inclusions (hardzinc, oxides, sintered charge), peeling of the coating from the base metal are not allowed.

Separate flux spots and traces of pipe capture by lifting devices, roughness and slight local zinc deposits are allowed.

It is allowed to correct individual non-galvanized sections by 0.5% of the outer surface of the pipe in accordance with GOST 9.307.

(Changed edition, Rev. No. 3, 4).

2.8. Pipes must withstand hydraulic pressure:

2.4 MPa (25 kgf / cm 2) - pipes, ordinary and light;

3.1 MPa (32 kgf / cm 2) - reinforced pipes.

At the request of the consumer, the pipes must withstand a hydraulic pressure of 4.9 MPa (50 kgf / cm 2)

2.9. Pipes with a nominal bore up to 40 mm inclusive must withstand a bend test around a mandrel with a radius equal to 2.5 of the outer diameter, and with a nominal bore of 50 mm - on a mandrel with a radius equal to 3.5 of the outer diameter.

At the request of the consumer, the pipes must withstand the expansion test:

for pipes with conditional passage from 15 to 50 mm - not less than 7%;

for pipes with a nominal bore of 65 or more - at least 4%.

At the request of the consumer, the pipes must withstand the flattening test up to a distance between the flattened surfaces equal to 2/3 of the outer diameter of the pipes.

2.8,2.9. (Changed edition, Rev. No. 2, 3, 5).

2.10. At the request of the consumer, the mechanical properties of pipes for parts of water and gas pipeline structures must comply with GOST 1050.

2.11. The pipe thread must be clean, free of flaws and burrs and comply with GOST 6357, accuracy class B.

Pipes with cylindrical threads are used when assembling with seals.

2.10; 2.11. (Changed edition, Rev. No. 3, 4).

2.12. In the place of the seam, blackness is allowed on the threads of the thread, if the decrease in the normal height of the thread profile does not exceed 15%, and at the request of the consumer does not exceed 10%.

Threads with broken (for cut) or incomplete (for knurled) threads are allowed on threads, provided that their total length does not exceed 10% of the required thread length, and at the request of the consumer does not exceed 5%.

2.13. It is allowed on the thread to reduce the useful length of the thread (without run-off) up to 15% compared to that specified in, and at the request of the consumer up to 10%.

2.12.,2.13. (Changed edition, Rev. No. 2, 3, 5).

2.14. Threading galvanized pipes is carried out after galvanizing.

2.15. (Deleted, Rev. No. 3).

2.16. At the request of the consumer, welded seams of pipes are subjected to control by non-destructive methods.

(Revised edition, Rev. No. 5).

3. ACCEPTANCE RULES

3.1. Pipes are accepted in batches. The batch must consist of pipes of the same size, of the same brand and be accompanied by one quality document in accordance with GOST 10692 with an addition for pipes intended for the manufacture of parts for water and gas pipeline structures, made of steel according to GOST1050: chemical composition and mechanical properties of steel in accordance with the document on the quality of the blank manufacturer.

The mass of the party is not more than 60 tons.

(Changed edition, Rev. No. 3, 4).

3.2. Surface, dimensions and curvature are checked for each pipe of the batch.

It is allowed to use statistical control methods according to GOST 18242 with a normal level. Control plans are established by agreement between the manufacturer and the consumer.

The control of the outer diameter of the pipes is carried out at a distance of at least 15 mm from the end of the pipe.

(Changed edition, Rev. No. 3, 4, 5).

3.3. To control the parameters of the thread, to test for expansion, flattening, bending, the height of the internal burr, burr residue, right angle and chamfer angle (for pipes with beveled edges), mechanical properties, no more than 1%, but not less than two pipes from the batch, are selected, and for pipes made by continuous furnace welding - two pipes per batch.

(Changed edition, Rev. No. 3, 4).

3.4. All pipes are subjected to mass control.

(Revised edition, Rev. No. 3).

3.5. Each pipe is subjected to a hydraulic pressure test. With 100% quality control of the weld by non-destructive methods, hydraulic pressure testing may not be carried out. At the same time, the ability of the pipes to withstand the test hydraulic pressure is guaranteed.

(Revised edition, Rev. No. 6).

3.6. To check the thickness of the zinc coating on the outer surface and in accessible places on the inner surface, two pipes are taken from the lot.

(Revised edition, Rev. No. 2).

3.7. If unsatisfactory test results are obtained for at least one of the indicators, a second test is carried out on a double sample.

The results of repeated tests apply to the entire batch.

4. TEST METHODS

4.1. For quality control, one sample is cut from each selected pipe for each type of test.

The tensile test is carried out in accordance with GOST 10006. Instead of the tensile test, it is allowed to control the mechanical properties by non-destructive methods.

4.2. Inspection of the surface of the pipes is carried out visually.

4.3. Hydraulic testing is carried out according to GOST 3845 with exposure under test pressure for at least 5 s.

4.4. The bend test is carried out according to GOST 3728. Galvanized pipes are tested before coating.

(Revised edition, Rev. No. 3).

4.4a. The expansion test is carried out according to GOST 8694 on a conical mandrel with a taper angle of 6 ° .

It is allowed to test on a mandrel with a taper angle of 30 ° .

(Changed edition, Rev. No. 3, 4).

4.4b. The flattening test is carried out according to GOST 8695.

(Revised edition, Rev. No. 3).

4.4c. Weld seam control is carried out by non-destructive methods according to normative and technical documentation.

(Introduced additionally, Rev. No. 3).

4.5. The thickness of the zinc coating on the outer surface and in accessible places on the inner surface is controlled in accordance with GOST 9.301 and GOST 9.302, as well as with devices of the MT-41NTs, MTZON or Impulse types according to the regulatory and technical documentation.

4.6. The thread is checked with threaded ring gauges according to GOST 2533 (third class of accuracy).

In this case, the screwing-in of the non-going ring gauge on the thread should be no more than three turns.

(Changed edition, Rev. No. 3, 4).

4.7. The curvature of the pipes is controlled by a straightedge in accordance with GOST 8026 and a set of probes according to ND.

(Changed edition, Rev. No. 3, 5).

4.8. The right angle of the ends of the pipes is controlled by a square 90 ° size 160´ 100 mm class 3 GOST 3749, plate probes of set 4 according to ND or goniometer GOST 5378. The bevel angle is controlled by a goniometer according to GOST 5378.

(Changed edition, Rev. No. 3, 6).

4.9. The control of the outer diameter is carried out with smooth micrometers in accordance with GOST 6507, gauges-brackets in accordance with GOST 2216 or GOST 18360.

The wall thickness, the height of the internal burr and the height of the burrs are measured with a micrometer according to GOST 6507-90 or a wall gauge according to GOST 11358 from both ends of the pipe.

The length of the pipes is measured with a tape measure according to GOST 7502. The thread is controlled by gauges according to GOST 2533.

Control of the mass of a batch of pipes is carried out on scales of not more than 10 tons with a division value of not more than 20 kg.

(Changed edition, Rev. No. 3, 4, 5, 6).

4.10. Weld seam control is carried out by non-destructive methods according to technical documentation.

(Introduced additionally, Rev. No. 4).

5. MARKING, PACKAGING, TRANSPORT AND STORAGE

5.1. Marking, packaging, transportation and storage are carried out in accordance with GOST 10692 with an addition.

5.1.1. Pipe threads must be protected from mechanical damage and corrosion grease according to normative and technical documentation.

Sec. 5. (Revised edition, Rev. No. 3).

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Ferrous Metallurgy of the USSR

DEVELOPERS

V. I. Strzhok, cand. tech. Sciences, V. M. Vorona, Ph.D. tech. Sciences, Yu. M. Mironov, cand. tech. nook, A. I. Postolova

2. APPROVED AND INTRODUCED BY Decree of the State Committee of the USSR on Standards dated September 11, 1975 No. 2379

3. Periodicity of inspection 5 years

4. REPLACE GOST3262-62

5. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS

	Item number
GOST 9.301-86
GOST 9.302-88
GOST 9.307-89
GOST 380- 94
GOST 1050-88
GOST 2216-84
GOST 2533-88
GOST 3728-78
GOST 3749-77
GOST 3845-75
GOST 5378-88
GOST 6357-81
GOST 6507-90
GOST 7502-89
GOST 8026-92
GOST 8694-75
GOST 8695-75
GOST 8944-75
GOST 8954-75
GOST 8965-75
GOST 8966-75
GOST 10006-80
GOST 10692-80
GOST 11358-89
GOST 18242-72
GOST 18360-9 3

6. The validity period was removed by the Decree of the State Standard of November 12, 1991 No. 1726

7. Reprinted with Amendments No. 1, 2, 3, 4, 5, 6, approved in November 1977, December 1978, January 1987, May 1988, November 1989, November 1991 (IUS 1 -78.2-79, 4-87, 8-88, 2-90, 2-92)

Water-supply and gas-supply steel pipes. Specifications

GOST 3262-75

OKP 13 8500, OKP 13 8501

Introduction date 01.01.77

(Changed edition, Rev. No. 2, 3, 5).

1. ASSORTMENT

1.1. Pipes are made according to the dimensions and weight given in table. one.

At the request of the consumer, light series pipes intended for thread rolling are manufactured according to the dimensions and weight given in Table. 2.

(Changed edition, Rev. No. 1, 3).

1.2. The length of the pipe is made from 4 to 12 m:

measured or multiple measured length with an allowance for each cut of 5 mm and a longitudinal deviation for the entire length plus 10 mm;

unmeasured length.

By agreement between the manufacturer and the consumer, up to 5% of pipes with a length of 1.5 to 4 m are allowed in a batch of off-gauge pipes.

Table 1

Table 2

N o t e s:

1. For a thread made by knurling, a reduction in its inner diameter of up to 10% along the entire length of the thread is allowed on the pipe.

2. The mass of 1 m of pipes is calculated with a steel density of 7.85 g / cm 3. Galvanized pipes are 3% heavier than non-galvanized ones.

1.3. Limit deviations in pipe dimensions should not exceed those indicated in Table. 3.

Table 3

N o t e s:

1. The maximum deviation in the plus side along the wall thickness is limited by the maximum deviations in the mass of pipes.

2. Pipes of ordinary manufacturing accuracy are used for water pipes, gas pipelines and heating systems. Pipes of increased manufacturing accuracy are used for parts of water and gas pipeline structures.

1.4. Maximum deviations in the mass of pipes should not exceed +8%.

At the request of the consumer, the maximum deviations in mass should not exceed:

7.5% - for the party;

10% - for a single pipe.

(Changed edition, Rev. No. 2, 5).

1.5. The curvature of pipes per 1 m of length should not exceed:

2 mm - with nominal bore up to 20 mm inclusive;

1.5 mm - with nominal bore over 20 mm.

1.6. Pipe threads can be long or short. Thread requirements must comply with those specified in table. 4.

Table 4

1.7. Pipes with a nominal bore of 6, 8, 10, 15 and 20 mm are wound in coils at the request of the consumer.

EXAMPLES OF CONVENTIONS

Ordinary pipe, non-galvanized, of the usual manufacturing accuracy, random length, with a nominal bore of 20 mm, a wall thickness of 2.8 mm, without thread and without a coupling:

Pipe 20 -2.8 TOAST 3262-75

The same with the clutch:

Pipe M-20 -2.8 TOST 3262-75

The same, measured length, threaded:

Pipe R-20 2.8-4000 TOST 3262-75

The same, zinc coated, random length, threaded:

Pipe Ts-R-20 -2.8 TOST 3262-75

The same, with zinc coating, measured length, with thread:

Pipe Ts-R-20 -2.8-4000 TOST 3262-75

For pipes for thread rolling, the letter H is indicated after the word "pipe" in the symbol.

For pipes with a long thread, the letter D is indicated after the word "pipe" in the symbol.

For pipes of increased manufacturing accuracy, the letter P is indicated in the symbol after the nominal bore size.

(Revised edition, Rev. No. 1).

2. TECHNICAL REQUIREMENTS

2.1. Pipes are manufactured in accordance with the requirements of this standard and according to the technological regulations approved in the prescribed manner, from steels in accordance with GOST 380 and GOST 1050 without standardization of mechanical properties and chemical composition.

Pipes for parts of water and gas pipeline structures are made of steel according to GOST 1050.

2.2. At the request of the consumer, the ends of pipes to be welded with a wall thickness of 5 mm or more must be chamfered at an angle of 35-40 ° to the end of the pipe. In this case, an end ring with a width of 1-3 mm should be left.

At the request of the consumer, on ordinary and reinforced pipes with a nominal bore of more than 10 mm, the thread is applied to both ends of the pipe.

2.1, 2.2. (Changed edition, Rev. No. 3, 4).

2.3. At the request of the consumer, the pipes are equipped with couplings made in accordance with GOST 8944, GOST 8954, GOST 8965 and GOST 8966, at the rate of one coupling for each pipe.

(Revised edition, Rev. No. 3).

2.4. Cracks, captivity, swelling and sunsets are not allowed on the surface of the pipes.

At the ends of the pipes, delamination is not allowed.

On pipes made by furnace welding, it is allowed to reduce the outer diameter to 0.5 mm at the weld site if there is a gentle thickening of the inner diameter of not more than 1.0 mm in this place.

(Changed edition, Rev. No. 3, 4).

(Changed edition, Rev. No. 2, 3, 4, 5, 6).

2.6. Pipe ends must be cut square. The value of the bevel of the end face is not more than 2°. Burr residues should not exceed 0.5 mm. When removing burrs, the formation of blunting (rounding) of the ends is allowed. It is allowed to cut pipes in the mill line.

By agreement between the manufacturer and the consumer, burrs up to 1 mm are allowed on pipes with a nominal bore of 6-25 mm, made by furnace welding.

(Changed edition, Rev. No. 4, 6).

2.7. Galvanized pipes must have a continuous zinc coating over the entire surface with a thickness of at least 30 microns. The absence of zinc coating on the ends and threads of pipes is allowed.

On the surface of galvanized pipes, blistering and foreign inclusions (hardzinc, oxides, sintered charge), peeling of the coating from the base metal are not allowed.

Separate flux spots and traces of pipes being caught by lifting devices, roughness and slight local zinc deposits are allowed.

It is allowed to correct individual non-galvanized sections by 0.5% of the outer surface of the pipe in accordance with GOST 9.307.

(Changed edition, Rev. No. 3, 4).

2.8. Pipes must withstand hydraulic pressure:

2.4 MPa (25 kgf / cm 2) - ordinary and light pipes;

3.1 MPa (32 kgf / cm 2) - reinforced pipes.

At the request of the consumer, the pipes must withstand a hydraulic pressure of 4.9 MPa (50 kgf / cm 2).

At the request of the consumer, the pipes must withstand the expansion test:

for pipes with nominal bore from 15 to 50 mm - not less than 7%;

for pipes with a nominal bore of 65 mm or more - at least 4%.

At the request of the consumer, the pipes must withstand the flattening test up to a distance between the flattened surfaces equal to 2/3 of the outer diameter of the pipes.

2.8, 2.9. (Changed edition, Rev. No. 2, 3, 5).

2.10. At the request of the consumer, the mechanical properties of pipes for parts of water supply and gas pipeline structures must comply with GOST 1050.

2.11. The pipe thread must be clean, without flaws and burrs, and comply with GOST 6357, accuracy class B.

Pipes with cylindrical threads are used when assembling with seals.

2.10, 2.11. (Changed edition, Rev. No. 3, 4).

2.12. In the place of the seam, blackness on the threads of the thread is allowed if the decrease in the normal height of the thread profile does not exceed 15%, and at the request of the consumer does not exceed 10%.

Threads with stripped (for cut) or incomplete (for knurled) threads are allowed on threads, provided that their total length does not exceed 10% of the required thread length, and at the request of the consumer does not exceed 5%.

2.13. It is allowed on the thread to reduce the useful length of the thread (without run-off) up to 15% compared to that indicated in Table. 4, and at the request of the consumer - up to 10%.

2.12, 2.13. (Changed edition, Rev. No. 2, 3, 5).

2.14. Threading on galvanized pipes is carried out after galvanizing.

2.15. (Deleted, Rev. No. 3).

2.16. At the request of the consumer, pipe welds are subjected to control by non-destructive methods.

(Revised edition, Rev. No. 5).

3. ACCEPTANCE RULES

3.1. Pipes are accepted in batches. The batch must consist of pipes of the same size, one brand steel and be accompanied by one quality document in accordance with GOST 10692 with an addition for pipes intended for the manufacture of parts for water and gas pipeline structures, made of steel in accordance with GOST 1050; the chemical composition and mechanical properties of steel - in accordance with the document on the quality of the enterprise - the manufacturer of the workpiece.

Party weight - no more than 60 tons.

(Changed edition, Rev. No. 3, 4).

3.2. The surface, dimensions and curvature are checked for each pipe of the batch.

It is allowed to apply statistical control methods according to GOST 18242 with a normal level. Control plans are established by agreement between the manufacturer and the consumer.

The control of the outer diameter of the pipes is carried out at a distance of at least 15 mm from the end of the pipe.

(Changed edition, Rev. No. 3, 4, 5).

3.3. To control the parameters of the thread, to test for expansion, flattening, bending, the height of the internal burr, burr residues, right angle and chamfer angle (for pipes with bevelled edges), mechanical properties, no more than 1%, but not less than two pipes from the batch, are selected, and for pipes manufactured by continuous furnace welding - two pipes from the batch.

(Changed edition, Rev. No. 3, 4).

3.4. All pipes are subjected to mass control.

(Revised edition, Rev. No. 3).

(Revised edition, Rev. No. 6).

3.6. To check the thickness of the zinc coating on the outer surface and in accessible places on the inner surface, two pipes are taken from the lot.

(Revised edition, Rev. No. 2).

3.7. Upon receipt of unsatisfactory test results for at least one of the indicators, it is repeated tests on a double sample.

The retest results apply to the entire lot.

4. TEST METHODS

4.1. For quality control, one sample is cut from each selected pipe for each type of test.

The tensile test is carried out in accordance with GOST 10006. Instead of the tensile test, it is allowed to control the mechanical properties by non-destructive methods.

4.2. Inspection of the surface of the pipes is carried out visually.

4.3. Hydraulic testing is carried out in accordance with GOST 3845 with exposure under test pressure for at least 5 s.

4.4. The bend test is carried out according to GOST 3728. Galvanized pipes are tested before coating.

(Revised edition, Rev. No. 3).

4.4a. The expansion test is carried out according to GOST 8694 on a conical mandrel with a taper angle of 6°.

The test can be carried out on a mandrel with a taper angle of 30°.

(Changed edition, Rev. No. 3, 4).

4.46. The flattening test is carried out according to GOST 8695.

(Revised edition, Rev. No. 3).

4.4c. Weld seam control is carried out by non-destructive methods according to normative documentation.

(Introduced additionally, Rev. No. 3).

4.5. The thickness of the zinc coating on the outer surface and in accessible places on the inner surface is controlled in accordance with GOST 9.301 and GOST 9.302, as well as with devices of the MT-41NTs, MTZON types or the Impulse type according to regulatory documentation.

4.6. The thread is checked with threaded ring gauges according to GOST 2533 (third class of accuracy).

In this case, the screwing of the non-going gauge-ring on the thread should be no more than three turns.

(Changed edition, Rev. No. 3, 4).

4.7. The curvature of the pipes is controlled by a straightedge in accordance with GOST 8026 and a set of probes according to ND.

(Changed edition, Rev. No. 3, 5).

4.8. The right angle of the ends of the pipes is controlled by a 90 ° square with a size of 160 100 mm of class 3 according to GOST 3749, plate probes of set 4 according to ND or a goniometer according to GOST 5378. The bevel angle is controlled by a goniometer according to GOST 5378.

(Changed edition, Rev. No. 3, 6).

4.9. The control of the outer diameter is carried out with smooth micrometers in accordance with GOST 6507, with staple gauges in accordance with GOST 2216 or GOST 18360.

The wall thickness, the height of the internal burr and the height of the burrs are measured with a micrometer according to GOST 6507 or a wall gauge according to GOST 11358 from both ends of the pipe.

The length of the pipes is measured with a tape measure in accordance with GOST 7502. The thread is controlled with gauges in accordance with GOST 2533.

The control of the mass of a batch of pipes is carried out on scales of not more than 10 tons with a division value of not more than 20 kg.

(Changed edition, Rev. No. 3, 4, 5, 6).

4.10. Weld seam control is carried out by non-destructive methods according to technical documentation.

(Introduced additionally, Rev. No. 4).

5. MARKING, PACKAGING, TRANSPORT AND STORAGE

5.1. Marking, packaging, transportation and storage are carried out in accordance with GOST 10692 with an addition.

5.1.1. Pipe threads must be protected from mechanical damage and corrosion by lubricant according to normative documentation.

Sec. 5. (Changed edition, Rev. No. 3).

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of Ferrous Metallurgy of the USSR DEVELOPERS

V. I. Strizhok, Ph.D. tech. sciences; V. M. Vorona, Ph.D. tech. sciences; Yu. M. Mironov, Ph.D. tech. sciences; A. I. Postolova

2. APPROVED AND INTRODUCED BY Decree of the USSR State Committee for Standards dated 11.09.75 No. 2379

3. Periodicity of inspection - 5 years

4. REPLACE GOST 3262-62

5. REFERENCE REGULATIONS AND TECHNICAL DOCUMENTS

6. The validity period was removed by the Decree of the State Standard of November 12, 1991 No. 1726

7. EDITION with Amendments No. 1, 2, 3, 4, 5, 6, approved January 1987, May 1988, November 1989, November 1991 2-90, 2-92)

In the territory Russian Federation GOST R 50779.71-99 applies.

STEEL WATER AND GAS PIPES

TECHNICAL CONDITIONS

GOST 3262-75

STANDARDS PUBLISHING HOUSE

Moscow

STATE STANDARD OF THE UNION OF THE SSR

the dateintroductions 01.01.77

1. ASSORTMENT

1.1. Pipes are made according to the dimensions and weight given in table. one.

At the request of the consumer, light series pipes intended for thread rolling are manufactured according to the dimensions and weight given in Table. 2.

(Changed edition, Rev. No. 1 , 3 ).

1.2. The length of the pipe is made from 4 to 12 m:

measured or multiple measured length with an allowance for each cut of 5 mm and a maximum deviation for the entire length plus 10 mm;

unmeasured length.

By agreement between the manufacturer and the consumer, up to 5% of pipes with a length of 1.5 to 4 m are allowed in a batch of off-gauge pipes.

Table 1

Dimensions, mm

Conditional pass	Outside diameter	Pipe Wall Thickness			Weight of 1 m of pipes, kg
Conditional pass	Outside diameter		ordinary	enhanced		ordinary	enhanced

table 2

Dimensions, mm

Conditional pass	Outside diameter	Wall thickness	Weight of 1 m of pipes, kg

Notes:

1. For a thread made by knurling, a reduction in its inner diameter of up to 10% along the entire length of the thread is allowed on the pipe.

2. The mass of 1 m of pipes was calculated with a steel density of 7.85 g / cm 3. Galvanized pipes are 3% heavier than non-galvanized ones.

1.3. Limit deviations in pipe dimensions should not exceed those indicated in Table. 3.

Table 3

Pipe dimensions	Limit deviations for manufacturing precision pipes
		elevated
Outer diameter with nominal bore:
up to 40 mm incl.
	- 0,5
Outer diameter with nominal bore: over 40 mm
	- 1,0
Wall thickness	- 15 %	- 10 %

Notes :

1. The maximum deviation in the plus side along the wall thickness is limited by the maximum deviations in the mass of pipes.

1.4. Maximum deviations in the mass of pipes should not exceed +8%.

At the request of the consumer, the maximum deviations in mass should not exceed:

7.5% - for the party;

10% - for a single pipe.

(Changed edition, Rev. No. 2, 5).

1.5. The curvature of pipes per 1 m of length should not exceed:

2 mm - with nominal bore up to 20 mm inclusive;

1.5 mm - with nominal bore over 20 mm.

1.6. Pipe threads can be long or short. Thread requirements must comply with those specified in table. 4.

2.2. At the request of the consumer, the ends of the pipes to be welded, with a wall thickness of 5 mm or more, must be chamfered at an angle of 35-40 ° to the end of the pipe. In this case, an end ring with a width of 1 - 3 mm should be left.

At the request of the consumer, on ordinary and reinforced pipes with a nominal bore of more than 10 mm, the thread is applied to both ends of the pipe.

2.1; 2.2. (Changed edition, Rev. No. 3, 4).

2.3. At the request of the consumer, the pipes are equipped with couplings made in accordance with GOST 8944, GOST 8954, GOST 8965 and GOST 8966 at the rate of one coupling for each pipe.

(Revised edition, Rev. No. 3).

2.4. Cracks, captivity, swelling and sunsets are not allowed on the surface of the pipes.

At the ends of the pipes, delamination is not allowed.

On pipes made by furnace welding, it is allowed to reduce the outer diameter to 0.5 mm at the weld site if there is a gentle thickening of the inner diameter of not more than 1.0 mm in this place.

(Changed edition, Rev. No. 3, 4).

(Changed edition, Rev. No. 2, 3, 4, 5, 6).

2.6. Pipe ends must be cut square. The value of the bevel of the end is allowed no more than 2 ° . Burr residues should not exceed 0.5 mm. When removing burrs, the formation of blunting (rounding) of the ends is allowed. It is allowed to cut pipes in the mill line.

By agreement between the manufacturer and the consumer, burrs up to 1 mm are allowed on pipes with a nominal bore of 6-25 mm, made by furnace welding.

(Changed edition, Rev. No. 4, 6).

2.7. Galvanized pipes must have a continuous zinc coating over the entire surface with a thickness of at least 30 microns. The absence of zinc coating on the ends and threads of pipes is allowed.

On the surface of galvanized pipes, blistering and foreign inclusions (hardzinc, oxides, sintered charge), peeling of the coating from the base metal are not allowed.

Separate flux spots and traces of pipes being caught by lifting devices, roughness and slight local zinc deposits are allowed.

It is allowed to correct individual non-galvanized sections by 0.5% of the outer surface of the pipe in accordance with GOST 9.307.

(Changed edition, Rev. No. 3, 4).

2.8. Pipes must withstand hydraulic pressure:

2.4 MPa (25 kgf / cm 2) - pipes, ordinary and light;

3.1 MPa (32 kgf / cm 2) - reinforced pipes.

At the request of the consumer, the pipes must withstand a hydraulic pressure of 4.9 MPa (50 kgf / cm 2)

At the request of the consumer, the pipes must withstand the expansion test:

for pipes with nominal bore from 15 to 50 mm - not less than 7%;

for pipes with a nominal bore of 65 or more - at least 4%.

At the request of the consumer, the pipes must withstand the flattening test up to a distance between the flattened surfaces equal to 2/3 of the outer diameter of the pipes.

2.8, 2.9. (Changed edition, Rev. No. 2, 3, 5).

2.10. At the request of the consumer, the mechanical properties of pipes for parts of water and gas pipeline structures must comply with GOST 1050.

2.11. The pipe thread must be clean, without flaws and burrs, and comply with GOST 6357, accuracy class B.

Pipes with cylindrical threads are used when assembling with seals.

2.10; 2.11. (Changed edition, Rev. No. 3, 4).

2.13. It is allowed on the thread to reduce the useful length of the thread (without run-off) up to 15% compared to that specified in, and at the request of the consumer up to 10%.

2.12., 2.13. (Changed edition, Rev. No. 2, 3, 5).

2.14. Threading on galvanized pipes is carried out after galvanizing.

2.15. (Deleted, Rev. No. 3).

2.16. At the request of the consumer, welded seams of pipes are subjected to control by non-destructive methods.

(Revised edition, Rev. No. 5).

3. ACCEPTANCE RULES

3.1. Pipes are accepted in batches. The batch must consist of pipes of the same size, of the same brand and be accompanied by one quality document in accordance with GOST 10692 with an addition for pipes intended for the manufacture of parts for water and gas pipeline structures, made of steel according to GOST 1050: chemical composition and mechanical properties of steel in accordance with the quality document of the blank manufacturer.

The mass of the party is not more than 60 tons.

(Changed edition, Rev. No. 3, 4).

3.2. The surface, dimensions and curvature are checked for each pipe of the batch.

It is allowed to apply statistical control methods according to GOST 18242 with a normal level. Control plans are established by agreement between the manufacturer and the consumer.

The control of the outer diameter of the pipes is carried out at a distance of at least 15 mm from the end of the pipe.

(Changed edition, Rev. No. 3, 4, 5).

3.3. To control the parameters of the thread, to test for expansion, flattening, bending, the height of the internal burr, burr residues, right angle and chamfer angle (for pipes with beveled edges), mechanical properties, no more than 1%, but not less than two pipes from the lot are selected, and for pipes manufactured by continuous furnace welding, two pipes per lot.

(Changed edition, Rev. No. 3, 4).

3.4. All pipes are subjected to mass control.

(Revised edition, Rev. No. 3).

(Revised edition, Rev. No. 6).

3.6. To check the thickness of the zinc coating on the outer surface and in accessible places on the inner surface, two pipes are taken from the lot.

(Revised edition, Rev. No. 2).

3.7. If unsatisfactory test results are obtained for at least one of the indicators, a second test is carried out on it on a double sample.

The retest results apply to the entire lot.

4. TEST METHODS

4.1. For quality control, one sample is cut from each selected pipe for each type of test.

The tensile test is carried out according to GOST 10006. Instead of tensile testing, it is allowed to control mechanical properties by non-destructive methods.

(Changed edition, Rev. No. 3, 6).

4.2. Inspection of the surface of the pipes is carried out visually.

4.3. Hydraulic testing is carried out in accordance with GOST 3845 with exposure under test pressure for at least 5 s.

4.4. The bend test is carried out according to GOST 3728. Galvanized pipes are tested before coating.

(Revised edition, Rev. No. 3).

4.4a. The expansion test is carried out according to GOST 8694 on a conical mandrel with a taper angle of 6 ° .

It is allowed to test on a mandrel with a taper angle of 30 ° .

(Changed edition, Rev. No. 3, 4).

4.4b. The flattening test is carried out according to GOST 8695.

(Revised edition, Rev. No. 3).

There are special documents in accordance with which VGP steel water and gas pipes are produced. GOST 3262–75 is a standard for the production of goods for operation in open areas, laying pipelines for working under pressure, pumping gas and liquids. Products are used in construction, housing, agricultural production.

General information

Pipes for laying water and gas pipelines, the technical requirements for which are set out in regulatory documents, are intended for their intended purpose. The difference between them lies in the method of production. By whatever method VGP pipes are produced, GOST 3262–75 determines all the parameters and positions of finished products, categories of certain types and directions of operation during economic activities.

According to the standard, water and gas pipes are galvanized and non-galvanized. Finished goods come to the market in two forms:

with threaded ends;
with no thread.

Areas of use

Water and gas collectors are used in the production of repair and construction works. These products are used in the arrangement of gas and water communications, heating systems, are laid in public buildings, private buildings, multi-storey buildings, educational institutions, industrial and agricultural facilities.

According to GOST, pipes are produced in measured and random lengths, it is allowed to produce according to customer sizes. The standard lengths are 4, 6 and 12 meters.

Wall thickness

This is the parameter by which the types of water and gas pipes are distinguished. GOST subdivides them into types depending on weight:

In accordance with GOST, the product is produced with a conditional inner diameter of 10-65 mm, the outer diameter is 16-74 mm. Specifications are determined according to standard standards, but the presence of a thread for a threaded connection at the end of the pipes is determined by the customer.

The popularity of threaded products is explained by the fact that when installing pipes, it is not necessary to do welding, this reduces the cost of work and saves money.

GOST states that the error of the outer diameter should not exceed:

with precise manufacturing processing up to a size of 40 mm - 0.4−0.5%, over 40 mm - from 0.8 to 1%;
with increased accuracy of release, the size of pipes up to 40 mm - 0.4%, over 40 mm - 0.8%;
deviation of the weight per linear meter should not be more than 8%.

Production features

The material is carbon steel. The production sequence consists of the main cycles:

In its final form, rolled products are treated with heat, which increases the strength of the product, resistance to destructive external factors improves performance properties.

Galvanized steel water and gas pipes GOST 3262–75 are produced in the following accuracy groups:

ordinary accuracy - in their production, the chemical composition of the metal and its mechanical properties are not standardized, the use of products is limited to water, gas mains, heating systems;
increased accuracy - these include steel pipes with zinc coating of specified parameters, used for parts of critical highways.

Threaded ends

The thread at the ends of the pipes is cut or rolled during the production process for pipes with a wall thickness of more than 5 mm. It is taken into account that the inner and outer diameters of the product change. The length of the threaded section and its application at one or both ends varies at the request of the customer. Products with a galvanized coating weigh 3% more than those made of metal without the use of a protective layer. Technological requirements are defined for the formed thread:

Technical requirements for finished products

Standards and technological regulations are contained in GOST, manufacturers should not deviate from regulatory indicators. Requirements for manufactured products:

Welded pipes

Welded pipes are obtained by folding a metal sheet. The seam can be located along the pipe or formed in a spiral. Modern ways production make it possible to obtain the strength of the product in the place of the weld by only 7–12% less than the same indicator in the straight section. For water and gas pipes obtained by welding, requirements are imposed, ensuring quality in work:

Galvanized surfaces

Zinc coating protects the walls from corrosion, forming a film on the metal during oxidation. The layer prevents the penetration of oxygen into the depth of the metal and stops further destruction. The coverage requirements are as follows:

Test Guidelines

Usually, the study of the seam is done using x-rays. It is a mandatory step included in the quality control procedure. The weld seam is considered to be a place of increased risk of depressurization under load, but it is not considered a disadvantage. Control methods are regulated technical requirements. Hydraulic test checks the pressure, maintained by pipes of various types:

reinforced - 3.1 MPa or 32 KGS per cm 2;
light and ordinary - 2.4 MPa or 25 KGS per cm 2;
improved - 4.9 MPa or 50 KGS per cm 2.

The bend test determines the possibility of warping without loss of properties. Products with a nominal bore of 40 mm allow 2.5, and pipes of 50 mm - 3.5 of the size of the outer diameter.

The expansion test is the precise determination of pipe strength or weld resistance in welded products. To do this, a segment is cut out of the control pipe and a test is carried out. In this case, the distribution rate is:

for products 16−50 mm - no more than 7%;
for pipes larger than 65 mm - up to 4%.

Storage conditions

Special requirements are imposed on the packaging of VGP pipes only if their outer diameter is 6–20 mm. At the request of the customer, the products are rolled into coils. Galvanized products are protected from water and stored securely. Metal pipes without anti-corrosion coating are stored fixed and only in dry rooms, making sure that the humidity does not exceed the permissible levels.

The METALLSERVICE company supplies the entire range of steel water and gas pipes that meet the requirements of GOST 3262-75. Wholesale prices apply to all metal products.

The catalog contains galvanized and non-galvanized products DN 8–100 mm, with or without knurled or cut cylindrical threads. Rolled metal of this type is always available in warehouses in Moscow, St. Petersburg, Samara, Rostov-on-Don, Penza, Novosibirsk, Khabarovsk and other cities. Delivery is carried out throughout Russia and the Republic of Belarus. The speed of shipment depends on the ordered batch and averages 1-12 hours.

Classification of gas pipes according to GOST 3262-75

There are several length options available:

measured (4–12 m);
multiple measured (up to 12 m, allowance for each undercut - 5 mm, longitudinal deviation along the entire length - up to 10 mm);
unmeasured (by individual size, within 4–12 m).

Up to 5% of the total number of off-gauge VGP pipes manufactured in accordance with GOST 3262-75 can be made with a length of 1.5–4 m. For the entire length of the thread made by knurling, the inner diameter of the products can be reduced by 10%.

The mass of 1 m of the presented metal products is indicated taking into account the density of the steel alloy of 7.85 g per cubic meter. see. At the same time, VGP galvanized pipes weigh 3% more than non-galvanized ones.

Depending on the degree of compliance with regulatory geometric parameters, pipes are divided into 2 classes:

According to the wall thickness, the products are divided into light, ordinary and reinforced. On products of the last two types, having a nominal bore of more than 10 mm, threads can be applied at both ends. The choice includes products both without thread and without couplings, and with both.