GOST 24030-80

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  ГОСТ 24030-80

GOST 24030−80 seamless tubes of corrosion-resistant steel for power engineering. Specifications (with Amendments No. 1, 2, 3)

GOST 24030−80

Group В62

INTERSTATE STANDARD

SEAMLESS TUBES FROM CORROSION-RESISTANT STEEL
FOR POWER

Specifications

Corrosion-resistant steel seamless tubes for power engineering industry.
Specifications

ISS 23.040.10
OKP 13 1600

Date of introduction 1981−07−01

INFORMATION DATA

1. APPROVED AND put INTO EFFECT by Decision of the USSR State Committee for standards from 11.03.80 N 1100

2. INTRODUCED FOR THE FIRST TIME

3. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

4. Limitation of actions taken by Protocol No. 5−94 of the Interstate Council for standardization, Metrology and certification (I & C N 11−12−94)

5. EDITION with Amendments No. 1, 2, 3, approved in November 1984, December 1985, November 1989 (IUS 2−85, 4−86, 2−90)


This standard applies to pipes made of corrosion-resistant steel used for power.

(Changed edition, Rev. N 3).

1. ASSORTMENT

1.1. Sizes of cold and warm pipes shall be as specified in table.1, the dimensions of the hot pipes — in table.2.

Table 1

Table 2

1.2. The length of the pipe divided, as indicated in the claims.1.2.1; 1.2.2.

1.2.1. Cold and warm:

measuring length — no more than the length specified in the table.1; in agreement with the consumer pipes are manufactured length up to 12,5 m;

dimensional length, measuring length with an allowance for each cut to 5 mm and a maximum deviation over the entire length +15 mm;

random length from 1,5 to 8 m; in agreement with the consumer pipes are manufactured length up to 12.5 m. By agreement between manufacturer and consumer pipes up to 25 mm are made with a length of 16 m.

1.2.2. Hot:

length — not less than indicated in the table.2;

random length from 1,5 to 7 m; in agreement with the consumer pipes are made in length more than 7 m;

dimensional length, measuring length with an allowance for each cut to 5 mm and a maximum deviation over the entire length +15 mm.

1.2.1, 1.2.2. (Changed edition, Rev. N 2).

1.3. In the party of off-gage pipes allowed no more than 15% of the pipes in meters, length of 1.5 m, but not less than 0.75 m for hot pipes and 0.5 m for the cold and warm.

1.4. Limit deviation of outside diameter of pipes are shown in table.3, wall thickness — in table.4.

Table 3

Note. At the request of the consumer for pipe diameters 146−273 mm limit deviations of the outside diameter shall not exceed ±1,0%.

Table 4

(Changed edition, Rev. N 2).

1.5. At the request of the consumer pipe is manufactured in dimensions and extreme deviations, are listed in the table.5.

Table 5

1.6. The curvature of the pipe at any section of 1 m length should not exceed:

for cold and warm tubes — 1 mm;

for hot-deformed pipes:

1.5 mm — wall thickness up to 10 mm, inclusive;

2.0 mm — wall thickness over 10 mm to 20 mm, inclusive;

4.0 mm — wall thickness over 20 mm.

Examples of symbols pipes

Pipe cold and warm, of group A, with a diameter of 76 mm with a wall thickness of 5 mm, non-standard, steel grade 08CR18NI10TI:

Pipe AH 76х5 — 08KH18N10T GOST 24030−80

The same group B, multiple 1.5 m:

Pipe BKH 76х5х1500 cu — 08KH18N10T GOST 24030−80

The same, hot, group A, measuring length 3 m:

Pipe AG 76х5х3000 — 08KH18N10T GOST 24030−80

2. TECHNICAL REQUIREMENTS

2.1. Pipe shall be manufactured in accordance with the requirements of this standard for technological regulations approved in the prescribed manner, of steel grade 08CR18NI10TI with a mass fraction of elements,%: carbon, manganese, silicon, respectively, not more than 0,08, with 1,5, 0,8; chrome 17,0−19,0; Nickel 10,0−11,0; titanium — 5хС-0,6; sulfur, phosphorus and nitrogen, respectively, not more than 0,020, 0,035, 0,05.

Pipes made from strain of the workpiece.

Note. The content of residual elements in accordance with GOST 5632.


(Changed edition, Rev. N 1).

2.2. The content of the nitrides and carbonitrides stroke should not exceed (maximum score):

2.5 points — for pipes with a diameter of 76 mm or less;

3.5 points — for pipes with a diameter greater than 76 mm.

The inclusion of uniformly distributed points is not limited.

The content of nonmetallic inclusions (for maximum points) must not exceed:

3 points — oxide and silicates;

1 point — sulphides;

2 points — silicates, non-deformed.

2.3. Grain size of metal of the finished tubing shall be not larger than:

5 points — for pipes with a diameter of 76 mm or less;

4 points — for pipes with a diameter greater than 76 mm.

For hot-deformed pipes with a wall thickness of 15 mm and over are allowed to manufacture pipes with the grain size not larger than 3 points.

2.4. Pipe should not be prone to intergranular corrosion.

2.5. Pipes should be free of cracks and tears during the flattening.

2.6. Pipes should be free of cracks and tears in the hand.

2.7. Tubes shall withstand hydraulic pressure (a) in accordance with the requirements of GOST 3845. The value shall be equal to 40% of the temporary tear resistance for this grade of steel.

The ability of pipe to withstand hydraulic pressure is provided by the production technology.

2.8. The pipe ends should be square-cut and cleaned of burrs.

2.9. Pipes must be thermally treated (astensione) and the Board.

(Changed edition, Rev. N 1).

2.10. Mechanical properties of pipes shall be as specified in table.6.

Table 6

Notes:

1. For ready-made tubes of groups A and B with a wall thickness of 15 mm rupture strength shall not be less than 490 MPa (50 kgf/mm).

2. Elongation is defined at the diameter less than 18 mm for groups A and B, shall be not less than 35%.

2.11. At the request of the consumer surface of the pipe must be:

a) electrochimpribor outer;

b) electrochimpribor external and internal;

in) electrochimpribor internal;

d) machined or polished outer;

d) light after etching;

e) light after the heat treatment in the atmosphere basicsliderui;

g) machined internal (hot pipes).

At the request of the consumer pipe, heat-treated in basicsliderui atmosphere, can be produced without machining, grinding, etching and electrochimpribor if the surface quality of the pipe meets the requirements of this standard.

Elektroimpoulsnoy with the inner surface of manufactured pipe internal diameter of 10 mm or more.

For pipes used to further limit, at the request of the customer can be manufactured with a surface in accordance with GOST 9940 for hot and GOST 9941 for cold pipes.

(Changed edition, Rev. N 1, 2).

2.12. The outer and inner surfaces of the finished pipe must be clean and not have cracks, captivity, flaws, tears, sunsets, local contact pereplavleni, the etching of the rash.

On the outer and inner surfaces are allowed roughness, threats, and bullies, rabiza, color tint, some scratches, shallow dings, and traces of scraping, boring and turning; the wall thickness should not be less than the permissible minimum values. Space cleansing of defects must be processed to a purity corresponding to the rest of the surface pipe, with a check for completeness of removal of defects.

On the outer surface allowed the cross risks from grinding stone.

On the inner surface of the pipe permitted electrochimpribor matte stripes caused by the accumulation of nitrides and carbonitrides of titanium.

2.13. Quality exterior and interior surfaces shall conform to the samples approved by the manufacturer and the customer.

3. ACCEPTANCE RULES

3.1. Pipes take by the parties. The party should consist of pipes of the same size and one mode of heat treatment, as customer’s request — one of melting and to be issued a single document on quality — according to GOST 10692 with the following addition:

the chemical composition of the steel and a content of nonmetallic inclusions — document the quality of billets;

the mode of heat treatment.

The number of tubes in the party not more than 400 PCs.

3.2. Control of the outer surface, size, presence of defects in the metal, the hydraulic pressure of the propensity to intergranular corrosion, and pipes of the group And the size of the grain and in tension at 623 K (350 °C) of finished pipe is subjected to each pipe.

Control of the inner surface is subjected to:

each pipe internal diameter of 10 mm or more;

2% of the pipe internal diameter less than 10 mm.

3.1, 3.2. (Changed edition, Rev. N 1).

3.3. For quality control of tubes from the party taken:

3 tubes — flattening and hand.

Thus for tubes of group B allowed the determination of the extent of testing based on statistical methods.

Group A:

A 10% in tension at 623 K (350 °C) pipes with a diameter up to 76 mm after the heat treatment;

The 5% in tension at 293 K (20 °C);

3% for the nitrides and carbonitrides of titanium.

Group B:

10% — on the value of grain;

The 5% in tension at 623 K (350 °C) of finished pipes and heat treated pipes with a diameter up to 76 mm inclusive;

2% in tension at 293 K (20 °C);

1% for the nitrides and carbonitrides of titanium.

Notes:

1. In the case of ultrasonic inspection of grain size, an additional metallographic examination of 5% of the tubes from the party.

2. In the case of the control tubes by the hardness of the additional control method of stretching for 3% of the pipes from the party.

3.4. If unsatisfactory test results of at least one of the indicators for him to repeat the test at twice the number of pipes selected from the same batch.

The results of repeated tests apply to the entire party.

4. TEST METHODS

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

4.2. Inspection of external and internal surfaces of pipes is carried out without the use of magnifying devices.

For pipe internal diameter of 10 mm or more, the inspection is carried out by periscope at both ends to a length of 4.2 m.

For pipes of internal diameter less than 10 mm examination is performed on cut samples with a length of 200 mm Samples cut from the two ends of the tube.

4.3. Measurement of pipe dimensions is carried out using a measuring instrument to ensure the necessary measurement accuracy.

Allowed to control the wall thickness of pipes by an ultrasonic method according to normative-technical documentation.

4.4. Control of nitride inclusions is carried out for pipes with a wall thickness of 2 mm or more by the method SH3 or Ш6 according to GOST 1778 on the longitudinal sections. For pipes with wall thickness less than 2 mm, the control is carried out according to normative-technical documentation.

(Changed edition, Rev. N 2).

4.5. Determination of grain size by metallographic methods is carried out according to GOST 5639.

Determination of grain size by ultrasonic method is carried out according to normative-technical documentation. In case of disagreement in the quality assessment using metallographic method.

4.6. Validation of the propensity to intergranular corrosion is carried out according to the method AM GOST 6032. Allowed to test according to the method of AMU; in case of disagreement in assessing the quality inspection is conducted according to the method AM GOST 6032.

4.7. Test flattening is carried out on pipes with a wall thickness of not more than 9 mm 8695 churchyard to receive sludinajumi between surfaces distance () in mm, calculated by the formula

where is the nominal wall thickness of pipe, mm;

 — nominal outside diameter of pipe, mm.

4.8. Test distribution is carried out on pipes with diameter up to 40 mm according to GOST 8694 a mandrel with the taper angle 30°, an amount equal to 10% of the original diameter.

4.9. The hydraulic pressure test is carried out according to GOST 3845 with aging pipes under pressure of not less than 10 s.

4.10. The tensile test was carried out at 293 K (20 °C) according to GOST 10006, at 623 K (350 °C) — according to GOST 19040. The speed of the movable grip not more than 10 mm/min, in case of disagreement in the quality assessment — 4 mm/min. allowed to exceed the test speed to 40 mm/min after reaching the yield stress.

Control of mechanical properties may be performed by the method of hardness according to technical documentation, agreed in the prescribed manner.

4.11. Control of the presence of defects in the metal pipe is carried out by ultrasonic method churchyard 17410 and technical documentation.

Ultrasonic inspection is carried out when setting up the equipment for artificial defects applied on the outer and inner surfaces of the test sample and having a depth from the nominal thickness of the wall:

(4,5±0,5)% (group a), and (7±0,5)% (group B) for pipes with diameter more than 10 mm with the ratio of the diameter to the wall thickness of more than or equal to 5;

10% for pipes with a diameter of 10 mm or less, with the ratio of the diameter to the wall thickness of more than or equal to 5 (groups A and B) and the pipe surface in accordance with GOST 9940 and GOST 9941.

For pipes with a ratio of diameter and wall thickness of less than 5. the ultrasonic inspection is carried out on pipes, in which the ratio of diameter to thickness of 5 or more; adjustment of equipment is carried out to the appropriate depth risks (4,5; 7 or 10%). Ultrasonic testing can be finished pipe when setting up the instrument at an artificial defect with a depth of 10%.

5. MARKING, PACKAGING, TRANSPORTATION AND STORAGE

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

5.1.1. Each pipe with a diameter of 20 mm and over with wall thickness of 2,5 mm and over must have a mark at a distance of not more than 50 mm from the end or the end: of trademark of manufacturer, grade of steel, the manufacture of group (A or B), the batch number, the number of tube.

Pipe with a diameter less than 20 mm with a wall thickness of less than 2.5 mm brand the number of pipes and group (A or B). On marked section of the pipe, there is a distortion of the profile. The quality of the surface at the site of the marking is not specified. The value of the marked part of the pipe is included in the total length of the pipe.

(Changed edition, Rev. N 1).

5.1.2. The pipes should be interleaved with paper according to GOST 8828 or GOST 9569, Packed in boxes of GOST 10198 or GOST 2991 or GOST 24634.

Packaging tubes with outer surface without polishing in lattice boxes according to GOST 10198 or GOST 2991 or GOST 24634, or other packing according to normative-technical documentation.

Allowed laying in a box for GOST 10198 or GOST 2991 or GOST 24634нескольких packets or tubes of various sizes, provided their separation.

In coordination with the consumer pipes without outer polishing are supplied without packaging in boxes or crates.

(Changed edition, Rev. N 1, 2).