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DIN 2391 St 44-2 Seamless Precision Steel Tubes Cold Drawn Cold Rolled Pipe
Main steel grades: RSt 34-2, RSt 37-2, St 44-2, St 35, St 45, St 52
Application: apply to the Precision steel tubes used.autos, machinery, oil cylinders, motorcycle shock absorbers, and the inner cylinders of auto shock absorbers.
Chemical Requirements & Mechanical Proterties:
| DIN 2391 Seamless Precision Steel Tubes Mechanical Proterties | |||
| Steel Grade | TS, N/mm2 (min) | YS N/mm2(min) | Elongation, % (min) |
| NBK | |||
| RSt 34-2 | 210 - 410 | 205 | 28 |
| RSt 37-2 | 340 - 470 | 235 | 25 |
| St 44-2 | 410 - 540 | 255 | 21 |
| BK | |||
| RSt 34-2 | 460 | - | 6 |
| RSt 37-2 | 490 | - | 6 |
| St 44-2 | 290 - 310 | - | 5 |
| GBK | |||
| RSt 34-2 | 300 | - | 28 |
| RSt 37-2 | 315 | - | 25 |
| St 44-2 | 390 | - | 21 |
| DIN 2391 Seamless Precision Steel Tubes Chemical Composition (%, max) | |||||
| Steel Grade | C | Si | Mn | S | P |
| RSt 34-2 | 0,15 | 0,30 | 0,60 | 0,025 | 0,025 |
| RSt 37-2 | 0,17 | 0,30 | 0,70 | 0,025 | 0,025 |
| St 44-2 | 0,21 | 0,30 | 1,1 | 0,025 | 0,025 |
Inspection and Test: chemical composition test, mechanical properties test(tensile, yield, elongation), process properties test(flatting, flaring, bending, hardness, impact, etc.), appearance and size test, non-destructive inspection test, hydrostastic test.
Delivery status: Annealed, normalized, normalized+Tempered, etc.
End: plain end, beveled end, threaded
End protection: plastic caps
Outside coating: black painting, anti-corrosion oil,galvanized finish, finish as per customer requirements.
Packing: Exporting package/wooden box /as requirement.
