GOST 6856-54
GOST 6856−54 Pipes of steel of special profiles
GOST 6856−54
Group B62
INTERSTATE STANDARD
PIPES STEEL SPECIAL PROFILES
Steel pipes of special profiles
Date of introduction 1954−04−01
APPROVED by the Department for Standardization under the State Planning Committee of the USSR on January 12, 1954.
REVISION
This standard applies to electric-welded and seamless cold-drawn pipes of special profiles made of carbon steel.
I. PROFILES AND DIMENSIONS
1. The following should be made for the profiles and dimensions of the pipe:
a) electric-welded D-shaped — in accordance with Fig. 1;
b) seamless cold-drawn:
oval — in accordance with features 2,
D-shaped — in accordance with features 3,
oval-cylindrical — in accordance with feature 4 and table (types I and II).
Devil. Pipes D-shaped (electrically welded)
Pipes D- shaped
(electrically welded)
Devil.1
Damn. Pipes are oval (seamless)
Pipes oval
(seamless)
Devil.2
Damn. Pipes D-shaped (seamless)
Tubes D -o braznye
(seamless)
Damn.3
Damn. Pipes are oval-cylindrical (seamless)
Oval-cylindrical tubes
(seamless)
Dam 4
| Type of pipe |
Size, mm | ||||||||
| I |
43 |
32 |
4.0 |
3.2 |
32 |
525 |
500 |
1025 |
15 |
| Extras. off |
+ 0.50 -1.00 |
+ 0.50 -1.00 |
+ 0.60 -0.40 |
+0.40 -0.30 |
+0.30 |
+20 |
10 |
+30 |
- |
| II |
45 |
28 |
2.0 |
2.5 |
28 |
420 |
120 |
540 |
eleven |
| Extras. off |
+ 0.50 -1.00 |
+ 0.50 -1.00 |
+0.30 -0.20 |
+0.40 -0.25 |
+0.30 |
+20 |
10 |
+30 |
- |
The dimensions of the oval section refer to the section of the end of the nominal length of the oval part of the pipes.
Conventions
a) pipes of oval-cylindrical type I:
Pipe OTSI GOST 6856−54
b) tubes of oval-cylindrical type II:
Pipe OTSII GOST 6856−54
c) Oval seamless pipes:
Pipe OF GO ST 6856−54
d) D-shaped seamless pipe:
Pipe Db, GOST 6856−54
e) pipes D-shaped electrowelded:
Pipe a DC GOS T 6856−54
2 . In length, oval, D-shaped seamless and D-shaped electric-welded pipes should be manufactured:
a) an unlimited length from 1.5 to 7 m;
b) dimensional length within the limits of a non-dimensional, with a permissible deviation of +15 mm;
c) the length of a multiple dimensional within the dimensionless, with an allowance for each incision of 5 mm and with an allowable deviation of a total length of +15 mm.
3. Delivery of non-dimensional pipes of a length exceeding the limits specified in clause 2 of this standard, but not shorter than 560 mm, in an amount not exceeding 10% of the lot (per square meter) is allowed.
II. TECHNICAL CONDITIONS
4. Seamless pipes should be made of steel grade 35, and electrowelded — from steel grades 08 and 10 according to GOST 1050−88.
5. Pipes should be supplied: seamless — in annealed, and electrically welded — in non-annealed condition.
6. On the surface of pipes, cracks, foils, flaws and sunsets are not allowed. On the outer surface of electric-welded pipes, grate and non-welded places are also not allowed.
The surface of pipes is also not allowed:
for electrically welded pipes — defects greater than 0.1 mm deep, which leads to the wall thickness and outside dimensions of the pipe beyond the permissible minus deviation;
for seamless pipes — defects of mechanical origin (nicks, dents, risks, etc.), scales and traces of stripping with a depth that removes the wall thickness and outside dimensions of the pipe beyond the permissible minus deviation.
7. The mechanical properties of seamless pipes must comply with the requirements of GOST 8733−74, and electrically welded to the requirements of GOST 10705−80.
8. Pipes D-shaped electrically welded should withstand flattening to the contact of internal walls without the formation of cracks and tears.
9. The ovality of the cylindrical part of the oval-cylindrical pipes and the difference in the pipes of all profiles should not lead to the pipe dimensions beyond the limits of tolerable deviations.
10. On the outer surface of D-shaped pipes (seamless and electric welded) concave sections are not allowed.
11. The convexity of the flat part of D-shaped seamless pipes shall not exceed 1 mm.
12. The curvature of the pipes shall not exceed:
a) oval-cylindrical;
for the oval part along the major axis — 3 mm, along the minor axis — 5 mm,
for the cylindrical part — 2 mm;
b) oval and D-shaped seamless — 2 mm per 1 m;
c) D-shaped electrowelded — 5 mm per 1 m.
13. The ends of the pipes must be cut at a right angle and stripped of burrs.
III. RULES OF ACCEPTANCE AND METHODS OF TESTS
14. Pipes should be accepted by the technical control department of the manufacturing enterprise. The manufacturer must ensure that all the pipes produced comply with the requirements of this standard and accompany each shipment of pipes with certified documents that certify their quality.
15. Pipes must be surrendered in batches. The batch should consist of pipes of the same steel grade and one size, in an amount not exceeding 200 pcs. for seamless pipes and not more than 500 pcs. for electric-welded pipes.
A pipe residue of less than 50% of the specified quantity must be connected to one of the pipe lots of the same steel grade and the same size. A balance of 50% or more of this amount is considered a separate batch.
16. The consumer has the right to perform a quality control of the pipes received for him and their compliance with the requirements of this standard, applying the methods of testing and testing specified in paragraphs 17−23.
17. Each pipe must be inspected and measured. Inspection should be done without the use of magnifying devices. The radii of the curvature of the profiles are not controlled. The depth of the defect should be determined by sweeping and measuring the size of the pipe at the place of stripping.
18. To check the chemical composition of the finished pipes from one of the pipes of this batch, the shavings are selected in accordance with GOST 7565−81 and produce an analysis according to GOST 22536.0−87, GOST 22536.1−88, GOST 22536.2−87, GOST 22536.3−88, GOST 22536.4−88, GOST 22536.5−87, GOST 22536.6−88.
19. Two pipes should be selected from each lot to check the mechanical properties and the flattening test. For each test from each selected pipe, one sample must be taken.
20. The tensile testing of pipes should be carried out according to GOST 1497−84 on a longitudinal, in the form of a strip or a piece of pipe, proportional to a long sample. A specimen from an electrically welded pipe should be cut at a distance of about 90 ° (circumferentially) from the seam.
21. The flattening test shall be carried out according to GOST 8695−75 on the annealed samples in the direction of the minor axis of the pipe.
22. If verification results are received that do not comply with the requirements of this standard for at least one sample, a second test shall be carried out for which a double number of new pipes selected from the same batch is selected.
In the event that the results of a re-examination do not comply with the requirements of this standard for at least one sample, the lot must be rejected.
In this case, the supplier is entitled to test and produce each pipe separately.
IV. PACKING AND MARKING
23. Pipes shall be supplied bundled in packages of not more than 80 kg. Each package must consist of pipes of the same size, one profile and one steel grade. For each package, a tag with the OEM stamp of the manufacturer must be affixed and the symbols of the pipes and their number in the package indicated.
24. At the request of the consumer, the manufacturer must paint one end of each pipe:
pipes from steel grades 08 and 10 — one strip of white color,
pipes of steel grade 35 — two stripes of yellow color.
25. Pipes for corrosion protection must be coated both inside and outside with neutral oil.
26. Each batch of pipes shall be supplied by the manufacturer with a document certifying that the pipes meet the requirements of this standard and are specified:
a) the name of the manufacturer;
b) the name of the pipes;
c) steel pipe grade;
d) number of pipes;
e) the results of the conducted tests;
f) the number of this standard.
