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Standard: DIN1629 Deutsche Industrie Normen
Uses: For manufacture of pipelines,vessels,equipment,pipe fittings and steel structures.
Chemical Composition(%):
| Grade | C | Si | Mn | P | S | Cr | Ni | Cu |
| St37.0 | ≤0.17 | 0.17-0.37 | 0.35-0.65 | ≤0.025 | ≤0.020 | ≤0.25 | ≤0.25 | ≤0.25 |
| St44.0 | ≤0.21 | 0.17-0.37 | 0.50-0.80 | ≤0.025 | ≤0.020 | ≤0.25 | ≤0.25 | ≤0.25 |
| St55 | 0.33-0.41 | 0.17-0.37 | 0.50-0.80 | ≤0.025 | ≤0.020 | ≤0.25 | ≤0.25 | ≤0.25 |
| St52.0 | ≤0.22 | ≤0.55 | ≤1.60 | ≤0.025 | ≤0.020 | ≤0.25 | ≤0.25 | ≤0.25 |
Mechanical Properties:
| Grade | Tensile strength (MPa) | Yield strength (Mpa) not less than | Elongation (%) not less than | |
| ≤16mm | >16mm | |||
| St37.0 | 350-480 | 235 | 225 | 25 |
| St44.0 | 420-550 | 275 | 265 | 21 |
| St55 | 540-645 | 295 | 285 | 17 |
| St52.0 | 500-650 | 355 | 345 | 21 |
Available Dimension Range:
Cold Finished Seamless Steel Tube and Pipe:Φ8~114.3*1~20mm
Hot-rolled Steel Tube and Pipe:Φ114.3~720*5~120mm
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