GOST 22786-77

• gost-22786-77.pdf (251.50 KiB)
  ГОСТ 22786-77

GOST 22786−77 bimetalic seamless Tubes for shipbuilding. Specifications (with Amendments No. 1, 2, 3, 4)

GOST 22786−77

Group В62

INTERSTATE STANDARD

BIMETALIC SEAMLESS TUBES
FOR SHIPBUILDING

Specifications

Bimetalic seamless tubes for shipbuilding.
Specifications

ISS 23.040.10
OKP 13 0200

Date of introduction 1979−01−01

INFORMATION DATA

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

DEVELOPERS

A. O. Semenov, M. Bernstein, S. G. Belik

2. APPROVED AND promulgated by the Decree of the State Committee of standards of Ministerial Council of the USSR from 16.11.77 N 2676

3. REPLACE GOST 5.1210−72

4. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS

5. Limitation of actions taken by Protocol No. 3−93 Interstate Council for standardization, Metrology and certification (ICS 5−6-93)

6. EDITION with Amendments No. 1, 2, 3, 4, approved in may 1980, July 1983, December 1987, November 1989 (IUS 7−80, 10−83, 4−88, 2−90)


This standard applies to bimetallic seamless tubes for shipbuilding with an outer layer of steel and an inner layer of copper.

(Changed edition, Rev. N 2, 4).

1. ASSORTMENT

1.1. The pipe dimensions shall be as specified in table.1.

Table 1

mm

Notes:

1. (Deleted, Rev. N 3).

2. The pipe wall thickness includes the thickness of the steel and copper layers.

3. The «+" sign means that pipe of these sizes are made, the sign «-" means that pipes are not made.

1.2. Pipe shall be manufactured:

random length from 3 to 9 m.

In the party of off-gage pipes allowed no more than 20% (by length) pipe length less than 3 m, but not less than 1.5 m;

dimensional — no longer than 7 m or a length that is a multiple dimensional.

1.1, 1.2. (Changed edition, Rev. N 2, 3).

1.3. Maximum deviations along the length of the pipe dimensional and dimensional shall not exceed ±10 mm.

For pipes dimensional, for each cut set the stock to 5 mm.

1.4. Tolerances for outside diameter of pipe must not exceed specified in table.2.

Table 2

mm

1.5. Limit deviation of the wall thickness of pipes should not exceed ±10%.

1.6. The thickness of the inner layer and maximum deviations depending on the grade of steel of the outer layer shall not exceed specified in table.3.

Table 3

mm

Example of designation pipe outer diameter 25 mm, wall thickness 2,0 mm thickness inner layer 0.5 mm, a length of a multiple of 3000 mm, with an outer layer of steel grade 12KHN3A and inner layer of copper grade MWR:

Pipe 25x2,0x0,5х3000 cu.-12KHN3A+M3r — GOST 22786−77.

The same, length 7000 mm, with an outer layer of steel of grade 20 and an inner layer of copper grade MWR:

Pipe 25x2,0x0,5х7000−20+MWR — GOST 22786−77.

The same random length with the outer layer of steel grade 10, and an inner layer of copper grade MWR:

Pipe 25x2,0x0,5−10+MWR — GOST 22786−77.

(Changed edition, Rev. N 2).

1.7. (Deleted, Rev. N 3).

1.8. The curvature of any section of the pipe at 1 m must not exceed 1.5 mm.

2. TECHNICAL REQUIREMENTS

2.1. Pipe shall be manufactured in accordance with the requirements of this standard.

2.2. Pipe must consist of steel outer and inner copper layers firmly connected to each other.

2.3. The outer layer shall be manufactured of steel grade 12KHN3A with the chemical composition of the churchyard 4543 and steel grades 10 and 20 with the chemical composition according to GOST 1050.

The inner layer shall be made of copper grade M3r with the chemical composition of the churchyard 859.

2.4. Pipes must be thermally processed. The mechanical properties of the pipes, depending on the grade of steel of the outer layer shall be as specified in table.4.

Table 4

(Changed edition, Rev. N 1, 2, 3).

2.5. Pipe must withstand the calculated hydraulic pressure in MPa (kgf/mm), whose value is calculated according to the formula in GOST 3845 for bimetallic tubes, where the allowable stress is:

for the inner copper layer — 54 N/mm(5,5 kgf/mm);

for the outer layer of steel 10 — 141 N/mm(14,4 kgf/mm), steel grade 20 to 165 N/mm(16,8 kgf/mm), steel stamps 12KHN3A — 274 N/mm(28 kgf/mm).

(Changed edition, Rev. N

3).

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

2.7. Pipe should not have cracks, captivity, flaws, tears, sunsets, deep dents, and scratches, descaling and etching of the rash.

Allowed to fix defects in the outer surface of the pipe by any method except welding and zachekanka if the diameter and wall thickness are not shown beyond the negative deviations.

2.8. On the outer and inner surfaces of the tubes permitted the RAID of the oxides can be easily removed with sandpaper and do not interfere with the inspection, a small shallow dents, scratches, risks, roughness, internal folds caused by the production method, provided that these defects do not derive the diameter and wall thickness limit deviation.

On the inner surface of allowed colors of tint.

On the outer surface allowed the patina of copper.

2.9. Pipe shall be exposed to etching, passivation, peskostrujnymi and continuous grinding.

2.10. Between the outer and inner layers of the allowed bundles, the length of a perimeter should not exceed 20% of outside diameter, length — 8 mm.

The maximum length of the bundles along the perimeter for pipes of an external diameter exceeding 40 mm should not exceed 8 mm.

3. ACCEPTANCE RULES

3.1. Pipes take by the parties. The party should consist of pipes of the same diameter and wall thickness and steel single trunks and be accompanied by a document about quality that contains:

the symbol of the manufacturer;

batch number;

brand steel and copper (for the document about the quality of the manufacturer of the workpiece);

the number of tubes in the batch;

the pipe dimensions (outer diameter, wall thickness and length);

the results of the tests;

the designation of this standard.

The number of pipes in the lot shall be no more than 250 PCs. — for pipes with a diameter more than 20 mm and not more than 300 PCs. — for pipes with a diameter of 20 mm or less.

(Changed edition, Rev. N 2, 3).

3.2. Checking of external and internal surfaces and dimensions must be subjected to each pipe of the party.

3.3. Each pipe is subjected to checking of the continuity of the connection layers and matching the grade of steel of the outer layer.

3.4. The thickness of the inner layer check for 5% of the pipes from each batch, but not less than five tubes.

3.5. The ability of pipe to withstand hydraulic pressure is provided by a method of production of pipes. The test for the indicator is allowed not to perform.

3.6. For testing mechanical and technological properties of the pipes set the following sample sizes:

tensile — 7% of the pipes from the party, but at least five of the tubes;

to bend and the hand — 2% of the pipes from the party, but at least two pipes;

the flattening — 5% of the pipes from the party, but not less than five tubes.

3.7. If unsatisfactory test results on the thickness of the inner layer, flattening, bending, hand and stretching at least one of the indicators it is carried out re-tests on twice the number of pipes that are not exposed to tests.

The results of repeated tests spread to the entire party.

3.6, 3.7. (Changed edition, Rev. N 2).

4. TEST METHODS

4.1. Each pipe in the party is subjected to inspection and measurement.

4.2. From each selected batch of pipe cut one sample for all tests except the flattening.

4.3. The outer surface of the pipe visually inspected.

4.4. Inner surface of the pipe inner diameter of 16 mm and more visiting with the help of a periscope with a 3−4-fold increase, and the pipes inner diameter less than 16 mm with the aid of the periscope according to the method of the manufacturer.

4.5. The thickness of the inner layer measured at both ends of the pipe at four points along the perimeter according to the method agreed between the manufacturer and the customer.

4.6. The tests shall be carried out:

tensile — according to GOST 10006. Allowed tensile test conduct according to the agreed between the manufacturer and the consumer of the method;

the bend — according to GOST 3728 around a mandrel of diameter equal to 2, where is the outer diameter of the pipe;

the distribution — according to GOST 8694 using the mandrel with a taper of 1:10 to increase the outer diameter by 10% of the original. The distribution pipe is subjected to an outer diameter of 22 mm and more;

by hydraulic pressure GOST 3845;

the flattening — GOST 8695 from one end of each selected pipe to receive clusively between surfaces distance:

 — for pipes with a diameter of 22 mm and over

 — for pipes with a diameter less than 22 mm, where the nominal wall thickness, the inside diameter of the pipe.

If the flattening on any sample discovered a delamination of the inner layer from the outer, tapered end of the pipe cut off and re-produce flattening of the pipe.

The length of the tapered part should not be less than 25 mm and should not be cut from the pipe.

4.7. After the test on the bend, the distribution and flattening of the samples should be free of cracks, tears and delamination of the inner layer from the outer.

4.8. Disclosure of the defects specified in paragraph 2.8, without discontinuity of the metal at trials flattening is not a rejection symptom. If necessary, the nature of defects and their depth are determined by metallographic studies.

4.9. Non-destructive test methods to establish the continuity of the connection layers is carried out according to the procedure agreed between the manufacturer and the consumer, for pipes of internal diameter 16 mm and above on a finished size, pipe inner diameter less than 16 mm — the nearest possible to control intermediate size.

4.10. The outer layer of pipe shall be tested for compliance with the grade of steel adopted in the factory method.

5. MARKING, PACKAGING, TRANSPORTATION AND STORAGE

5.1. (Deleted, Rev. N 2).

5.2. Stamp of technical control of the manufacturer and batch number must be put on one end of the pipe:

for pipes with diameter more than 20 mm and a wall thickness of 2 mm on each tube;

for pipes with a diameter of 20 mm or less and a wall thickness of 2 mm and less than 5% of the pipes from the party, but not less than five tubes.

5.3. For protection from corrosion the outer surface of the pipe cover industrial oil according to GOST 20799 or grease PVK GOST 19537 or a mixture thereof.

5.4. Tubes should be tightly tied in packages not less than three places in the 1−2 round wire with a diameter of not less than 3 mm according to GOST 3282, wrapped in paraffined paper GOST 9569 or packaging waterproof paper GOST 8828 or polyethylene film according to GOST 10354 for protection from the action of atmospheric precipitation and Packed in wooden boxes, manufactured according to GOST 10198 (types I or II) or normative-technical documentation.

Overall dimensions of the package of the pipes should not exceed the length of 9000 mm, a circumference of 350 mm. Pipe length less than 3000mm at the same time are packaged into a single package with pipe lengths of up to 9000 mm.

The mass of the box with the packs of pipes should not exceed 2 t

Packaging tubes are designed for areas far North and equated localities must comply with GOST 15846, group 142.

(Changed edition, Rev. N 2).

5.5. To the tapered part of one of the tubes of each package wire should be attached metal label stating:

the legend of the manufacturer;

the grade of steel and copper;

the size of the pipes;

batch number;

designation of this standard.

(Changed edition, Rev. N 2, 3).

5.6. On one side of each box must be clearly applied transport labeling, including basic, additional and informational inscriptions according to GOST 14192.

The marking is applied by painting with a stencil.

5.7. Pipe transporterowych train (on the open rolling stock), road and river transport in accordance with cargo carriage regulations applicable to transport of this species.

5.8. Pipe should be stored in packaging manufacturer indoors.

5.6−5.8. (Changed edition, Rev. N 2).

5.9. (Deleted, Rev. N 4).