GOST 8646-68
GOST 8646−68 steel Pipes with hollow ribs. Assortment (Change No. 1)
GOST 8646−68*
Group В62
INTERSTATE STANDARD
STEEL PIPES WITH HOLLOW RIBS
Assortment
Empty-ribbed steel tubes. Range
OKP 13 4400, 5100 13
Date of introduction 1969−01−01
APPROVED AND INTRODUCED by the Committee of standards, measures and measuring instruments under the USSR Council of Ministers on 25 April 1968
The expiration time limit is removed by the Resolution of Gosstandart from
REPLACE GOST 8646−57
* EDITION with Change No. 1 approved in August 1986 (IUS 11−86)
1. This standard applies to cold drawn seamless steel tubes with hollow ribs.
2. The shape and dimensions of the pipes must comply with:
type a traits.1 and table.1;
type B — features.2 and table 2;
type In — hell.3 and table.3.
Damn.1. Type A
Type A
Damn.1
Table 1
| Dimensions in mm | ||||||||
The cross-sectional area, cm |
Weight 1 m, kg |
The moment of inertia, cm |
The moment of resistance cm | |||||
| 25 |
1,0 |
4,6 |
1,02 |
0,797 |
1,30 |
0,573 |
0,627 |
0,451 |
| 1,2 |
4,8 |
1,21 |
0,951 |
1,54 |
0,672 |
0,746 |
0,529 | |
| 1,6 |
5,2 |
1,53 |
1,200 |
1,95 |
0,867 |
0,942 |
0,671 | |
Damn.2. Type B
Type B
Damn.2
Table 2
| Dimensions in mm | ||||||||
The cross-sectional area, cm |
Weight 1 m, kg |
The moment of inertia, cm |
The moment of resistance cm | |||||
| 18 |
1,0 |
4,0 |
0,593 |
0,466 |
0,191 |
0,116 |
0,228 |
0,0972 |
| 1,2 |
0,722 |
0,567 |
0,223 |
0,130 |
0,259 |
0,120 | ||
| 1,6 |
0,896 |
0,703 |
0,272 |
0,151 |
0,302 |
Of 0.146 | ||
Damn.3. Type In
Type In
Damn.3
Table 3
| Dimensions in mm | |||||||
The cross-sectional area, cm |
Weight 1 m, kg |
The moment of inertia, cm |
The moment of resistance cm | ||||
| 18 | 1,0 |
1,16 |
0,912 |
0,108 |
2,55 |
To 0.127 |
Of 1.00 |
| 1,2 |
1,38 |
1,090 |
0,130 |
3,07 |
0,153 |
1,21 | |
Note. The mass of the pipes calculated at steel density of 7.85 g/cm.
Examples of symbols
Pipe type outer dimensions 
The same dimensional length 6000 mm:
The same random length:
Pipe type B outer dimensions 
Then, type In:
In the designation of the steel hollow ribs tube types A, B and C, after the word «pipe» should be appropriately inserted the letter a, B or C.
(Changed edition, Rev. N 1).
3. The length of the pipe, as well as tolerances for the dimensions shall meet the requirements of GOST 8639−82.
4. Technical requirements should correspond to GOST 13663−86.
