GOST 8734-78 steel 20 carbon seamless steel tube
OD: 10mm-610mm
W. T.: 1.65-60mm
Standard: GOST 8734-78,GOST8731,GOST 8732,GOST 8733-74,GOST 550-75,et
Material: 10#,20#,Q195,Q235,Q345,Gr.A,Gr.B etc.
Dimensions of pipes and tolerances according to GOST 8732-78.
Technical requirements according to GOST 8731-74.
Length from 4 up to 11.7 m depending on diameter and wall thickness.
Groups of metrics of quality:
BВ - with rate setting of chemical composition for killed steel (grades according to GOST 1050-88, GOST 4543-71, GOST 19281-89);
V - with rate setting of mechanical properties and chemical composition;
G - with rate setting of chemical composition and control of mechanical properties for heat-treated samples. Mechanical properties are according to steel standards.
| Deminsion |
| OD, mm | WT, mm | OD, mm | WT, mm | OD, mm | WT, mm |
| 32 - 33,7 | 2,8 - 4,0 | 89 - 95 | 3,5 - 24 | 146 | 5 - 38 |
| 38 - 42,4 | 3 - 4,5 | 102 - 108 | 4 - 28 | 152 | 5 - 40 |
| 45 - 54 | 3,5 - 6,0 | 114 | 4,5 - 28 | 159 | 5 - 42 |
| 57 - 68 | 3,5 - 14 | 121 | 5 - 30 | 168 - 194 | 6 - 45 |
| 70 | 3,5 - 16 | 127 | 5 - 32 | 203 - 219 | 8 - 45 |
| 73 - 76 | 3,5 - 20 | 133 | 5 - 35 | | |
| 82,5 - 83 | 3,5 - 22 | 140 | 5 - 36 | | |
| Mechanical properties |
| Steel Grade | TS, N/mm2(min) | YS,N/mm2 (min) | E, % (min) |
| 10 | 353 | 216 | 24 |
| 20 | 412 | 245 | 21 |
| 35 | 510 | 294 | 17 |
| 45 | 588 | 323 | 14 |
| 10Mn2 | 421 | 265 | 21 |
| 20Cr | 431 | - | 16 |
| 40Cr | 657 | - | 9 |
| 30CrMnSi | 686 | - | 11 |
| 15CrMo | 431 | 225 | 21 |
| 30CrMn | 588 | 392 | 13 |
| Chemical composition (%, max) |
| Steel Grade | C | Si | Mn | Cr | Ni | Mo | S | P | Cu | N |
| 10 | 0,07-0,14 | 0,17-0,37 | 0,35-0,65 | 0,15 | 0,3 | - | - | - | - | - |
| 20 | 0,17-0,24 | 0,17-0,37 | 0,35-0,65 | 0,25 | 0,25 | |
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