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28MnB steel plate is an alloy structural steel plate. The 28MnB heat treatment processes include: hot rolling, controlled rolling, normalizing, normalizing plus tempering and quenching heat treatment processes.
28MnB steel plate smelting composition (content of each element):
| Grade | C | Mn | P | S | Si | Cr | Ti | B | Al |
| 28MnB | 0.25-0.32 | 1.00-1.50 | ≤0.035 | ≤0.035 | 0.15-0.40 | ≤0.30 | ≤0.06 | 0.0008-0.005 | ≤0.02 |
28MnB steel mechanical properties:
| Grade | Lower yield strength MPa | Tensile strength | Elongation A | Impact test at 20°C | |
| 28MnB | ≤16mm | 345 | 450-630MPa | ≥17% | ≥34J |
| 16-40mm | 335 | ||||
| 40-63mm | 325 | ||||
| 63-80mm | 315 | ||||
| 80-100mm | 305 | ||||
| 100-150mm | 285 | ||||
| 150-200mm | 275 | ||||
28MnB steel plate performance characteristics: good overall performance, good low temperature performance, cold stamping performance, welding performance and machinability.
