DIN 17172 STE320.7 STE360.7 STE385.7 seamless steel tubes/steel pipes usually are untreated, after a hot forming operation by rolling, pressing or drawing, on condition that said hot forming operation achieves an irreproachable structure condition with adequate uniformity without any further treatment.STE320.7 STE360.7 STE385.7 seamless steel tubes produced by cold rolled or cold drawn must be normalized in every case. The STE320.7 seamless pipe,STE360.7,seamless pipe,STE385.7seamless pipe manufactured under DIN 17172 generally are used for pipe lines for the transport of combustible fluids and gases.
DIN17172 STE320.7, STE360.7,STE385.7 seamless steel pipe chemical composition
| Steel grade | Type of deoxidation (RR.specially killed) | Chemical composition in % by wt | |||||
| Symbol | Material number | C | Si | Mn | P | S | |
| max | max | ||||||
| StE 320.7 | 1.0409 | RR | 0.22 | 0.45 | 0.7-1.3 | 0.040 | 0.035 |
| StE 360.7 | 1.0582 | RR | 0.22 | 0.55 | 0.9-1.5 | 0.040 | 0.035 |
| StE 385.7 | 1.8970 | RR | 0.23 | 0.55 | 1.0-1.5 | 0.040 | 0.035 |
DIN17172 STE320.7, STE360.7,STE385.7 seamless steel pipe mechanical property
| Steel grade | Yield Point | Tensile strength
N/mm2 |
Elongation | Impact energy At 0°C | ||
| Symbol | Material number | OD up to 500 | OD over 500 | |||
| N/mm2 min | % min | / min | ||||
| StE 320.7 | 1.0409 | 320 | 460 to 580 | 21 | 47 | 27 |
| StE 360.7 | 1.0582 | 360 | 510 to 630 | 20 | 47 | 27 |
| StE 385.7 | 1.8970 | 385 | 530 to 680 | 19 | 47 | 27 |
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