GOST 8732-78
GOST 8732−78 seamless steel Pipes hot-deformed. Assortment (with Amendments No. 1, 2)
GOST 8732−78
Group В62
INTERSTATE STANDARD
PIPES STEEL SEAMLESS HOT-DEFORMED
Assortment
Seamless hot-deformed steel pipes.
Range of sizes
ISS 23.040.10
OKP 13 1200, 13 1700, 1900 13
Date of introduction 1979−01−01
INFORMATION DATA
1. DEVELOPED AND INTRODUCED by the Ministry of ferrous metallurgy of the USSR
DEVELOPERS
A. A. Shevchenko, doctor of engineering. Sciences; V. P. Sokurenko, PhD. tech. Sciences; V. N. Rivne
2. APPROVED AND promulgated by the Decree of the State Committee of standards of Ministerial Council of the USSR from
3. REPLACE GOST 8732−70
4. The standard fully complies ST SEV 1481−78
5. REFERENCE NORMATIVE AND TECHNICAL DOCUMENTS
| The designation of the reference document referenced |
Item number |
| GOST 8731−74 |
9; 10 |
| GOST 9567−75 |
6 |
6. Limitation of actions taken by Protocol No. 3−93 Interstate Council for standardization, Metrology and certification (ICS 5−6-93)
7. EDITION with Amendments No. 1, 2 approved in February 1982, September 1988 (IUS 5−82, 1−89)
1. This standard applies to seamless hot-deformed steel pipes for General purposes, manufactured from the outside diameter, wall thickness and length.
2. Dimensions and weight of 1 m of pipes shall be as given in table.1.
Table 1
Extension table 1
Extension table 1
Extension table 1
Extension table 1
Notes:
1. The pipe sizes in brackets in the design of new equipment does not apply.
2. Weight of 1 m pipe is calculated by the formula 
where is the outer diameter expressed in mm;
— wall thickness, mm.
The density of steel is taken equal to 7,850 g/cm.
3. Pipe, the weight of which is limited to a broken bold line, are made by agreement between manufacturer and consumer.
4. Pipe outer diameters and wall thickness are marked with an asterisk apply to legal relations of economic and scientific-technical cooperation.
1, 2. (Changed edition, Rev. N 2).
3. The length of the pipe must be manufactured:
random lengths — ranging from 4 to 12.5 m;
measuring length within off-gage;
dimensional length within off-gage length with an allowance for each cut to 5 mm;
approximate length within off-gage length.
Notes:
1. By agreement with the consumer allowed to manufacture pipes with a length beyond the limits specified for pipes of random length.
2. For pipes with wall thickness more than 16 mm length of the measuring tubes is determined by agreement between manufacturer and consumer.
3. Pipe approximate length produce on demand of the consumer.
4. Maximum deviations along the length of the pipes lengths and dimensional length should not exceed: +10 mm — with length up to 6 m; +15 mm — at length of over 6 m or with outer diameter more than 152 mm; ±500 mm for an approximate length.
3, 4. (Changed edition, Rev. N 1).
5. Limit deviations for outer diameter and wall thickness of pipes shall not exceed that specified in table.2 and 3.
Table 2
| External diameter, mm | The maximum deviations of tubes for precision manufacturing | |
| high | normal | |
| To 50 incl. | ±0.5 mm |
±0.5 mm |
| SV.50 to 219 « | ±0,8% |
±1,0% |
| «219 | ±1,0% |
±1,25% |
Table 3
| External diameter, mm | Wall thickness, mm | Tolerances for wall thickness of tubes precision manufacturing, % | |
| high |
normal | ||
| To 219 |
To 15 incl. | ±12,5 | +12,5 -15,0 |
| SV. 15 to 30 | +10,0 Is 12.5 |
±12,5 | |
| 30 and above | ±10,0 | +10,0 Is 12.5 | |
| SV. 219 |
To 15 incl. | +12,5 -15,0 | |
| SV. 15 to 30 | ±12,5 | ||
| 30 and above | +10,0 Is 12.5 | ||
6. By agreement with the consumer pipes can be manufactured with a combination of extreme deviations, such as: the outside diameter of high accuracy according to GOST 9567, and the wall thickness ordinary precision, etc.
7. Ovality and raznoshennoy pipes should take the size of the pipes for maximum deviations in diameter and wall thickness.
8. The curvature of any section of the tube per 1 m of length should not exceed: 1.5 mm — for pipes with wall thickness up to 20 mm; 2.0 mm — for pipes with wall thickness more than 20 mm to 30 mm; 4,0 mm — for pipes with wall thickness over 30 mm.
9. At the request of the consumer pipes shall be supplied by the inner diameter and wall thickness, and inner and outer diameter and raznoshennoy.
Tolerances for inside diameter for pipe diameters 70−203 mm, wall 7−20 mm and a ratio of diameter and wall thickness equal to or less than 10, shall not exceed the respective limit deviations of the outside diameter specified in table.2.
For other pipe sizes, the maximum deviations at the inner diameter are set by agreement between manufacturer and consumer.
Examples of symbols
Pipe outer diameter 70 mm, wall thickness of 3.5 mm, a length in multiples of 1250 mm, regular accuracy of manufacturing, from steel grade 10, produced by group B GOST 8731:
Pipe outer diameter 70 mm, wall thickness 3.5 mm, length 6000 mm (measuring length), high precision manufacturing, of steel grade 40X, produced by a group VHOST 8731:
The same, of random length, is produced by group D GOST 8731:
Pipe outer diameter 219 mm, a wall thickness of 10 mm, random length, regular accuracy of manufacturing, from steel St4sp, category 1 steel, made by a group GOST 8731 of the ingot:
Pipe inner diameter of 70 mm, a wall thickness of 3.5 mm, length 6000 mm (measuring length), regular accuracy of manufacturing, from steel grade 10, produced by group B GOST 8731:
Pipe with an outer diameter of 95 mm, an inner diameter of 76 mm, permitted by raznostnogo of random length, regular accuracy of manufacturing, from steel grade 10, produced by group B GOST 8731:
(Changed edition, Rev. N 2).
10. Technical requirements — GOST 8731.
