GOST 3262-75

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  ГОСТ 3262-75

GOST 3262−75 steel Tubes for water and gas supply. Technical specifications (with Changes N 1, 2, 3, 4, 5, 6)

GOST 3262−75

Group В62

INTERSTATE STANDARD

PIPES STEEL WATER-GAS SUPPLY

Specifications

Water-supply and gas-supply steel pipes. Spesifications

ISS 23.040.10
OKP 13 8500, 8501 13

Date of introduction 1977−01−01

INFORMATION DATA

1. DEVELOPED AND INTRODUCED by the Ministry of ferrous metallurgy of the USSR

DEVELOPERS

V. I. Strugar, PhD. tech. Sciences; V. M. Crow, PhD. tech. of Sciences; Yu. M. Mironov, Cand. tech. Sciences; A. I. Postolov

2. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from 11.09.75 N 2379

3. The frequency of inspection — 5 years

4. REPLACE GOST 3262−62

5. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

6. The expiration time limit is removed by the Resolution of Gosstandart from 12.11.91 N 1726

7. EDITION (may 2007), with Changes N 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)

This standard applies to non-galvanized and galvanized welded steel pipe with knurled or chopped cylindrical thread and without thread, used for water and gas pipes, heating systems and for parts of water and gas structures.

(Changed edition, Rev. N 2, 3, 5).

1. ASSORTMENT

1.1. Pipe manufactured according to size and weight, are given in table.1.

At the request of the consumer tube light series designed under the knurling thread, produce size and weight, are given in table.2.

(Changed edition, Rev. N 1, 3).

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

or a multiple dimensional measuring length with an allowance for each cut is 5 mm and the longitudinal deviation of the entire length plus 10 mm.

of random length.

By agreement between manufacturer and consumer in the party of off-gage pipes is allowed up to 5% of the pipes length from 1.5 to 4 m.

(Changed edition, Rev. N 3, 4).

Table 1

Dimensions, mm

Table 2

Dimensions, mm

Notes:

1. For the thread made by rolling, the tube is allowed to decrease its inner diameter to 10% over the entire length of the thread.

2. Weight of 1 m of pipes calculated at the density of steel is equal to 7.85 g/cm. Galvanized pipes are heavier than ungalvanized 3%.

1.3. Tolerances for pipe sizes shall not exceed specified in table.3.

Table 3

Notes:

1. Limit deviation in the plus direction of wall thickness is limited by limiting deviations of pipe weight.

2. Pipe conventional manufacturing precision are used for water, gas and heating systems. Pipe manufacturing high precision parts used for water and gas structures.


(Changed edition, Rev. N 3).

1.4. Tolerances for the weight of pipes shall not exceed +8%.

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

+7,5% — for the party;

+10% — for individual tubes.

(Changed edition, Rev. N 2, 5).

1.5. The pipe curvature of 1 m of length shall not exceed:

2 mm — with nominal bore up to 20 mm, inclusive;

1,5 mm — with nominal bore over 20 mm.

1.6. Thread on the pipe can be long or short. Thread callouts shall be as specified in table.4.

Table 4

1.7. Pipe in nominal sizes 6, 8, 10,15 and 20 mm at the request of the consumer is wound into a coil.

Examples of symbols

Pipe ordinary, ungalvanized, regular accuracy of manufacturing, off-gage length, with internal diameter 20 mm, thickness of a wall 2,8 mm, without thread and without coupling:

Pipe 20X2,8 state standard 3262−75

Same with clutch:

Pipe M-20X2,8 state standard 3262−75

The same dimensional length, with the thread:

Pipe P-20X2,8−4000 GOST 3262−75

Same with a zinc coating random length, thread:

Pipe TS-R-20X2,8 state standard 3262−75

Same with zinc coating, length, thread:

Pipe TS-R-20X2,8−4000 GOST 3262−75

For pipes under the knurled thread in a symbol after the word «pipe» is indicated by the letter N.

For pipes with a long carving in the legend after the word «pipe» is indicated by the letter D.

Pipe and tube manufacturing high precision in a symbol after the size of the conditional passage is indicated by the letter P.

(Changed edition, Rev. N 1).

2. TECHNICAL REQUIREMENTS

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

Pipe parts for water and gas structures made from steels churchyard 1050.

2.2. At the request of the consumer at the ends of the pipes to be welded, the wall thickness of 5 mm or more, shall be removed chamfer with the angle of 35°-40° to the pipe end. This should be left to the socket ring width of 1−3 mm.

At the request of the consumer for ordinary and reinforced pipes with internal diameter more than 10 mm, the thread is applied to both ends of the pipe.

2.1, 2.2. (Changed edition, Rev. N 3, 4).

2.3. At the request of the consumer pipe couplings have made the graveyard 8944, 8954 GOST, GOST and GOST 8965 8966, at the rate of one coupler on each pipe.

(Changed edition, Rev. N 3).

2.4. On the surface of the pipe are not allowed cracks, slivers, bloating and sunsets.

The ends of tubes of the bundle are not allowed.

Allowed separate dents, rabiza, risk, signs of Stripping and other defects due to the method of production, if they do not take wall thickness for minimum sizes, as well as the layer of scale that do not impede the inspection.

The pipes, manufactured by furnace welding allowed in the seam reducing the outer diameter to 0.5 mm in the presence of this place sloping thickening at the inner diameter is not more than 1.0 mm.

(Changed edition, Rev. N 3, 4).

2.5. At the request of the consumer for pipes with a nominal bore of 20 mm or more on the inner surface of the seam pipes grat must be cut or tapered, and the height of burrs or traces thereof should not exceed 0.5 mm.

At the request of the consumer for pipes in nominal sizes over 15 mm, manufactured by furnace welding and hot reduction method, on the inner surface of the tube in the seam area allowed a gentle bulge height of not more than 0.5 mm.

(Changed edition, Rev. N 2, 3, 4, 5, 6).

2.6. The pipe ends must be cut at right angle. Allowed the magnitude of the slant end face is not more than 2°. Residues burrs shall not exceed 0.5 mm When the Burr removal allowed the formation of blunt (rounded) ends. Allowed cutting of the line pipes in the mill.

By agreement between manufacturer and consumer on pipes with nominal sizes 6−25 mm, manufactured by furnace welding, burrs are allowed up to 1 mm.

(Changed edition, Rev. N 4, 6).

2.7. Galvanized pipe must have a continuous zinc coating over the entire surface with a minimum thickness of 30 microns. Allowed no zinc coating at the ends and threaded pipe.

On the surface of the galvanized pipes is not permitted, the bubble and the foreign matter (hartsink, oxides, sintered charge), the peeling of the coating from the base metal.

Allowed separate flux stains and marks grip lifting devices, roughness and slight local nodules of zinc.

Corrections non-individual plots of 0.5% of the outer surface of the pipe according to GOST 9.307.

(Changed edition, Rev. N 3, 4).

2.8. Tubes shall withstand hydraulic pressure:

2.4 MPa (25 kgf/cm) pipe ordinary and easy;

At 3.1 MPa (32 kgf/cm) — pipes.

At customer’s request, tubes shall withstand hydraulic pressure of 4.9 MPa (50 kgf/cm).

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

At the request of the consumer, the pipes should withstand the test of the hand:

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

for pipes with a nominal bore 65 mm — at least 4%.

At the request of the consumer, the pipes should withstand the test of flattening to the distance between the tapered surfaces, equal to 2/3 of the outer diameter of the pipe.

2.8, 2.9. (Changed edition, Rev. N 2, 3, 5).

2.10. At the customer’s request of mechanical properties of pipes for water and gas parts of structures to meet the GOST 1050.

2.11. Threaded pipes must be clean, without flaws and free of burrs and conform to GOST 6357, accuracy class V.

Pipes with cylindrical thread to use when building with the seals.

2.10, 2.11. (Changed edition, Rev. N 3, 4).

2.12. In the seam allowed the black on the thread, if a decrease in the normal height of the thread profile does not exceed 15%, and the demand of the consumer exceeds 10%.

Allowed screw-threads stripped (chopped) or incomplete (for the thumb) thread, assuming that their length in an amount not exceeding 10% of the required thread length, and at the request of the consumer less than 5%.

2.13. Allowed in the thread of the reduction of the useful thread length (without taper) up to 15% in comparison with given in table.4, and at the request of the consumer — up to 10%.

2.12, 2.13. (Changed edition, Rev. N 2, 3, 5).

2.14. Tapping into galvanized pipe is carried out after galvanizing.

2.15. (Deleted, Rev. N 3).

2.16. At customer’s request, welded pipes subjected to non-destructive control methods.

(Changed edition, Rev. N 5).

3. ACCEPTANCE RULES

3.1. Pipes take by the parties. The party should consist of pipes of the same size, one grade of steel and be accompanied by one document on quality in accordance with GOST 10692 with the addition of pipes intended for manufacturing parts of water and gas structures, steel GOST 1050; chemical composition and mechanical properties of steel in accordance with the document on the quality of the manufacturer of the workpiece.

The mass of the party — not more than 60 t

(Changed edition, Rev. N 3, 4).

3.2. Check the surface, size and curvature are subjected to each pipe of the party.

It is possible to use statistical methods of control GOST 18242* with normal level. The control plans established by agreement between manufacturer and consumer.
________________
* On the territory of the Russian Federation GOST R 50779.71−99.


Control of the outer diameter of the pipes is carried out not less than 15 mm from the pipe end.

(Changed edition, Rev. N 3, 4, 5).

3.3. To control the parameters of the thread, for expansion testing, flattening, bend, the height of the inner bead, remnants of the burrs, straight angle, and the chamfer angle (for pipes with beveled edges), mechanical properties are taken no more than 1% but not less than two pipes from the party, and for pipe manufactured using a continuous furnace welding, two pipes from the party.

(Changed edition, Rev. N 3, 4).

3.4. Control mass subjected to all the pipes.

(Changed edition, Rev. N 3).

3.5. Test the hydraulic pressure is subjected to each pipe. At 100% strength quality control of the weld non-destructive methods of testing hydraulic pressure is allowed not to perform. The ability of pipe to withstand hydraulic test pressure is guaranteed.

(Changed edition, Rev. N 6).

3.6. To check the zinc coating thickness on the outer surface and in accessible areas of the inner surface of two pipe selected by the party.

(Changed edition, Rev. N 2).

3.7. If unsatisfactory test results of at least one of the indicators it is carried out re-testing at twice the sample.

The results of repeated tests apply to the entire party.

4. TEST METHODS

4.1. For quality control of each selected pipe cut one sample for each test.

The tensile test is carried out according to GOST 10006. Allowed to replace the tensile test to control the mechanical properties by nondestructive methods.

(Changed edition, Rev. N 3, 6).

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

4.3. Hydraulic testing is carried out according to GOST 3845 with the exposure under test pressure of not less than 5 s.

4.4. The test bend is carried out according to GOST 3728. Galvanized pipe experience to the coating.

(Changed edition, Rev. N 3).

4.4. Test distribution is carried out according to GOST 8694 on a conical mandrel with a cone angle of 6°.

Carrying out tests on the mandrel with a taper angle of 30°.

(Changed edition, Rev. N 3, 4).

4.4 b. Test flattening is carried out according to GOST 8695.

(Changed edition, Rev. N 3).

4.4 V. the inspection of welded seams is carried out by nondestructive methods according to the normative documentation.

(Added, Rev. N 3).

4.5. The thickness of the zinc coating on external surfaces and areas of the inner surface of the control according to GOST 9.301 and 9.302 GOST, as well as devices of the types MT-41НЦ, MTSON or type «Impulse» in the normative documentation.

4.6. Thread check screw sizes-rings according to GOST 2533 (the third class of accuracy).

Winchest impassable caliber-ring to the thread must be no more than three turns.

(Changed edition, Rev. N 3, 4).

4.7. The curvature of the pipes is controlled straightedge according to GOST 8026 and a set of probes for ND.

(Changed edition, Rev. N 3, 5).

4.8. Straight angle pipe ends is controlled by the angle 90° size 160х100 mm class 3 according to GOST 3749, vane probes set of 4 at the ND or the protractor according to GOST 5378. The chamfer angle of the chamfer is controlled with a goniometer according to GOST 5378.

(Changed edition, Rev. N 3, 6).

4.9. Control of the outer diameter is carried out smooth micrometer according to GOST 6507, gauges clamps according to GOST 2216 or GOST 18360.

Wall thickness, the inner Burr and the Burr height is measured with a micrometer churchyard 6507 or santomera according to GOST 11358 both ends of the pipe.

The length of the pipe measure tape according to GOST 7502. Thread control gauges according to GOST 2533.

Control of the batch weight of the pipes is carried out on the scale is not more than 10 tons with divisions not more than 20 kg.

(Changed edition, Rev. N 3, 4, 5, 6).

4.10. Control of the weld carried out using non-destructive methods for technical documentation.

(Added, Rev. N 4).

5. MARKING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. Marking, packaging, transportation and storage is carried out according to GOST 10692 with the Supplement.

5.1.1. Threaded pipes must be protected against mechanical damage and corrosion lubricant in the normative documentation.

Sec. 5. (Changed edition, Rev. N 3).