GOST 550-75

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  ГОСТ 550-75

GOST 550−75 seamless steel Pipes for petroleum refining and petrochemical industries. Specifications (with Amendments No. 1, 2, 3, 4)

GOST 550−75

Group В62

INTERSTATE STANDARD

SEAMLESS STEEL TUBES FOR PETROLEUM PROCESSING
AND PETROCHEMICAL INDUSTRY

Specifications

Seamless steel tubes for petroleum processing and petrochemical industry.
Specifications

ISS 23.040.10
OKP 13 1900, 4400 13, 13 5100

Date of introduction 1977−01−01

INFORMATION DATA

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

DEVELOPERS

O. A. Semenov, doctor of engineering. Sciences; V. P. Sokurenko, PhD. tech. Sciences; Vladimir Chebakov

2. APPROVED AND promulgated by the Decree of the State Committee of standards of Ministerial Council of the USSR from 26.06.75 N 1635

3. REPLACE GOST 550−58

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

5. The expiration time limit is removed by the Resolution of Gosstandart of the USSR from 20.06.91 N 922

6. EDITION with Amendments No. 1, 2, 3, 4, approved in August 1976, December 1981, December 1986, June 1991 (IUS 10−76, 3−82, 4−87, 9−91)


This standard applies to steel pipes for oil refining and petrochemical industry.

(Changed edition, Rev. N 4).

1. ASSORTMENT

1.1. Depending on the purpose of the pipe shall be made of groups A and B.

1.2. The dimensions of cold, warm and hot-deformed pipes of group A shall be as specified in table.1, cold and warm groups B, GOST 8734, hot-B — GOST 8732.

Table 1

Notes:

1. Pipe, the dimensions of which are shown in parentheses, are used for repairs only.

2. In coordination with the consumer pipe can be made longer than indicated in the table.1. This allowed the manufacture of pipes, welded, number of welds not more than one per pipe.

3. Pipe diameter up to 57 mm are made cold. Pipes with diameter 57 mm and more are manufactured hot.

4. On customer requirement tube diameter 6−102 mm are manufactured in length up to 7 m pipe diameter 108−159 mm produce length up to 9 m.


(Changed edition, Rev. N 2, 3).

1.3. Pipe group A shall be constructed of standard length in accordance with table.1, the minimum length should be at least 4 m.

The length of the tubes of group B must comply with the requirements of GOST 8732, GOST 8734.

1.4. The maximum deviations of tubes of group A must comply with the highest quality and should not exceed:

the outside diameter

for cold and warm tubes of steel grades 10 and 20 to GOST 9567,

for pipes made of alloy steel:

with a diameter of 30 mm ±0.2 mm,

with a diameter of over 30 mm — ±0.3 mm,

for hot pipes — %;

wall thickness

for cold and warm tubes — ±8%,

for hot-deformed pipes with a wall thickness of:

up to 15 mm ±12,5%,

more than 15 mm ±10%.

Limit deviations for outer diameter and wall thickness of the tubes of group B for the highest quality category must conform to the GOST 8734 and manufacturing high precision pipes according to GOST 8732, and for the first quality class must match the regular accuracy of manufacturing of pipes according to GOST 8732.

1.3, 1.4. (Changed edition, Rev. N 3).

1.5. Ovality and raznoshennoy pipes must not exceed:

group A — limit deviations for outer diameter and wall thickness for steel grades 10, 20 and 0.8 of the limit deviations for outer diameter and wall thickness for steel of other grades;

group B — tolerances for outside diameter and wall thickness specified in vhost GOST 8732 and 8734.

1.6. The curvature of any section of pipe bands And should not exceed 1.5 mm per 1 m, the curvature on the whole length of the pipe should not exceed 8 mm.

The maximum curvature of the pipe B group — according to GOST 8732, GOST 8734.

(Changed edition, Rev. N 2).

1.7. Maximum deviations along the length of the pipe groups A and B must not exceed:

+10 mm — at length of pipes up to 6 m;

+15 mm — at length of pipes more than 6 m, or of an external diameter exceeding 152 mm.

Examples of symbols

Pipe cold and warm with an outer diameter of 25 mm, a wall thickness of 2 mm, of steel grade 15H5M, length 9.0 m (group a):

Pipe A-25х2х9000 -15X5M GOST 550−75

Hot-deformed pipe outer diameter 219 mm, a wall thickness of 10 mm, of steel grade 15KH5VF, random lengths (group B):

Pipe B-219х10 — 15KH5VF GOST 550−75

The same length that are multiples of 4,5 m:

Pipe B-219х10х4500 cu — 15KH5VF GOST 550−75.

2. TECHNICAL REQUIREMENTS

2.1. Pipe manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner.

Pipe group A and B shall be manufactured from steel grades 10, 20 to GOST 1050, brand 10G2 — according to GOST 4543, brands 12MKH, 15H5, 15H5M, 15KH5VF, 12KH8VF — GOST 20072 and grades of steel 12X8, 1KH2M1 — with the chemical composition according to table.2.

Table 2

Note. Maximum deviations in chemical composition steel grade 1KH2M1 must meet the requirements of GOST 4543.


(Changed edition, Rev. N 1, 2, 3).

2.2. On the outer and inner surfaces of the tubes should not be captured, cracks, flaws, sunsets and wooloowin. These defects should be completely removed by gentle Stripping of local cold or solid sanding, boring and turning. The wall thickness in places of removal of defects shall not go beyond the minimum permissible values.

In the macrostructure of the pipe are not allowed cracks, delamination and flocs are visible without using the magnifying devices.

Allowed some minor nicks, dents, risks, and traces of Stripping defects, if the depth does not display the thickness of the pipe wall for maximum deviations, with the depth of the grooves should not exceed 1 mm, and the pipe group A length of 400 mm from the ends and 0.5 mm. For hot-deformed pipes of B group are also small slivers within the specified tolerances.

2.3. The pipe ends must be cut at right angle; wherein the cut end Squareness, mm should not exceed 2°.

At the request of the consumer at the ends of tubes with wall thickness above 5 mm should be beveled for welding.

By agreement with the consumer allowed to cut tubes of steel grades 10, 20, 10G2 plasma torch with a chamfer angle relative to the end of pipe more than 10°.

2.2, 2.3. (Changed edition, Rev. N 2).

2.4. Pipe shall be manufactured in heat treated condition. Hot tubes of steel grades 10, 20, 10G2 can be manufactured with rolling heating. Mechanical properties of metal of pipes shall be as specified in table.3.

Table 3

Note. At the customer’s request pipes of steel grade 10G2 should have toughness at temperatures of minus 40 °With not less than 25 j/cm(2,5 kgf·m/cm).


Hot-deformed pipes of steel grade 15H5M can be produced after normalization and tempering with the norms of mechanical properties not less than:  — 588 N/mm(60 kgf/mm), a  — 412 N/mm(42 kgf/mm),  — 16%,  — 65%, KCU — 98 j/cm(10 kgf·m/cm) and hardness Brinell hardness no more than 235.

For pipes of the highest quality of steel grade 15H5M rupture strength shall not be less than 421 N/mm(43 kgf/mm) for hot-deformed pipes and 412 N/mm(42 kgf/mm) for holodnodeformirovannyh pipes.

(Changed edition, Rev. N

1, 2, 3).

2.5. Tubes shall withstand hydraulic test pressure (and ) in accordance with the requirements of GOST 3845, but not more than 30 MPa (300 kgf/cm), with allowable stress equal to 40% of the temporary tear resistance, N/mm(kgf/mm), for a given steel grade.

(Changed edition, Rev. N 4).

2.6. Pipe group A with a diameter less than 159 mm with wall thickness not exceeding 8 mm should stand the test of the hand without the appearance of cracks and tears on the mandrel with a taper of not less than 6° (1 / 10th) to increase the outer diameter shown in table.4.

Table 4

2.7. At the request of the consumer pipe shall withstand flattening tests; to obtain sludinajumi between surfaces distance () in mm, calculated by the formula

,

where is the nominal wall thickness, mm;

 — nominal outside diameter, mm;

 — the deformation per unit of length, equal to 0.08.

2.8. At the request of the consumer pipe is subjected to flaw detection by nondestructive methods.

(Added, Rev. N 2).

3. ACCEPTANCE RULES

3.1. Pipes take by the parties. The party should consist of pipes of the same size, one mode of heat treatment, and for steel grades 12MKH, 15H5, 15H5M, 12H8, 12KH8VF and 1KH2M1 — one of melting and is accompanied by one document on quality according to GOST 10692 add: chemical composition of steel in accordance with the document on the quality of the manufacturer of the workpiece.

The number of tubes in the party is set for hot-deformed not more than 200 pieces, for cold and warm — no more than 400 PCs.

(Changed edition, Rev. N 2, 3).

3.2. Inspection of interior and exterior surfaces, sizes and flaw subjected to each pipe.

3.3. In case of disagreement in the evaluation of the chemical composition to check select at least one tube from the party.

3.4. Control of the macrostructure of the pipe is carried out at the request of the consumer.

3.2−3.4. (Changed edition, Rev. N 2).

3.5. For tensile tests, impact bending, flattening, distribution, to control the macrostructure of steel select two tubes from the party, and for hydraulic testing of 2% of the pipes, but at least two pipes from the party.

(Changed edition, Rev. N 4).

3.6. Hardness test is subjected to 10% of the tubes of group A and 2% B group pipes of steel grade 15H5M. Pipe group B from other brands of steel to control hardness are not exposed.

Hardness norms of pipes with wall thickness not less than 2.5 mm is determined by agreement between manufacturer and consumer.

(Changed edition, Rev. N 2).

3.7. (Deleted, Rev. N 2).

3.8. If unsatisfactory test results of at least one of the indicators it is carried out re-testing at twice the sample taken from the same batch of tubes.

The results of repeated tests apply to the entire party.

4. TEST METHODS

4.1. From each selected pipe cut:

for tensile tests — one sample;

testing hardness two samples;

for testing the impact strength — two of the sample;

for flattening test — one sample;

for expansion testing — one sample;

to control the macrostructure of one sample.

(Changed edition, Rev. N 4).

4.2. The wall thickness is checked at both pipe ends. Measurement of pipes the outside diameter is produced in any place other than the places of Stripping defects.

The wall thickness in places of Stripping is determined as the difference between the actual thickness from the end nearest the defect and the depth of Stripping by forming or measurement with ultrasonic thickness gauge.

Allowed to measure pipe by means of the instrument of automatic control. The outer surface of the pipe inspected without the use of magnifying devices. The internal surface of pipes with a diameter of 70 mm and more visiting with two sides with the help of a periscope with a twofold or more increase of the length of the periscope. When using perekopirovannye inspection is not carried out.

4.3. Sampling for chemical analysis should be performed according to GOST 7565.

Control of chemical composition is carried out according to the method of the manufacturer of the pipes, and with differences in the evaluation of the chemical composition — according to GOST 22536.0 to GOST 22536.1−22536.6 GOST, GOST 12344−12365 GOST, GOST 28473.

(Changed edition, Rev. N 4).

4.4. The tensile test shall be carried out on the longitudinal short-proportional sample according to GOST 10006. Test speed until the yield point is not more than 10 mm/min, yield point is not more than 40 mm/min.

Allowed to control the mechanical properties of pipes made from steels of all grades, except 15H5M, non-destructive methods according to normative-technical documentation.

The differences in the evaluation of the quality inspection is conducted according to GOST 10006.

(Changed edition, Rev. N 3).

4.5. Test for impact strength is carried out on pipes with wall thickness more than 12 mm the churchyard 9454 on samples of type 1. Samples cut out from ring at two diametrically opposed locations closer to the outer surface.

(Changed edition, Rev. N 4).

4.6. A test of the distribution shall be carried out according to GOST 8694.

4.7. Test flattening is carried out on pipes with a diameter of 22 mm and over with wall thickness of not more than 10 mm according to GOST 8695.

When discovering a tapered samples tiny tears or other minor defects allowed to re-test flattening of another sample taken from the same tube, with the preliminary removal of the surface layer (inner and outer) to a depth of not more than 0.2 mm for pipe diameters up to 108 mm and not more than 1 mm for pipes with diameter over 114 mm.

(Changed edition, Rev. N 2).

4.8. The hardness test shall be carried out according to GOST 9012 for tubes with wall thickness not less than 2.5 mm according to GOST 9013 for pipes with wall thickness less than 2.5 mm on both ends of the pipe.

For pipes subjected to heat treatment in continuous furnaces, hardness control at one end.

Allowed to control the hardness of tube of steel of all types, except 15H5M, non-destructive methods according to normative-technical documentation. The differences in the evaluation of the quality inspection is conducted according to GOST 9012, GOST 9013.

(Changed edition, Rev. N 3).

4.9. Macrostructure of the metal pipes checked for etched cross ring sample with GOST 10243.

Control of macrostructure subjected pipes with a wall thickness of 12 mm or more.

(Changed edition, Rev. N 2).

4.10. Hydraulic test of pipes shall be carried out according to GOST 3845 with the extract at a pressure of not less than 10 s.

Instead of hydraulic testing, the manufacturer is permitted to carry out inspection of each pipe using non-destructive methods to ensure that pipes standards hydraulic test pressure.

4.11. Inspection of pipes is performed according to the method approved in the prescribed manner.

4.12. Control of the outer diameter of the pipes is carried out with a caliper type SHC according to GOST 166, micrometer smooth MK-type according to GOST 6507, staples sheet according to GOST 18360.

Control of the wall thickness of the pipe is carried out with a micrometer type MT according to GOST 6507.

Control the length of the pipes is carried out measuring tape according to GOST 7502.

Control the curvature of the pipes is carried out with a straight edge according to GOST 8026 probe on the other 2−034−225.

(Changed edition, Rev. N 4).

5. MARKING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. Marking, packing, transportation, storage and documentation — 10692 churchyard with the following additions.

(Changed edition, Rev. N 3).

5.1.1. At one end of the pipe with a diameter of 25 mm and a wall thickness of at least 3 mm, at a distance of 1 m from one end should be clearly marked: the mark of the technical control Department, steel grade, and batch number.

5.1.2. Marking of pipes of steel grade 15H5M after normalization and tempering should be a stigma with the letter «U» (using a dash).

5.1.3. For pipes, which in the prescribed manner has the state quality Mark, label and document as should have the image of the national Mark of quality in the order established by Gosstandart.

(Changed edition, Rev. N 2).