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Mild steel (C≤0.25%), medium carbon steel (C 0.25-0.6%) and high carbon steel (C0.6%). According to different manganese content, high quality carbon structural steel can be divided into normal manganese content (0.25%-0.8% manganese content) and high manganese content (0.70%-1.20% manganese content), and the latter has better mechanical and machining properties.
ASTM A573Grade 70
| C max | Mn max | P max | S max | Si max | |
| 0.27 | 0.85-1.2 | 0.035 | 0.04 | 0.15-0.4 | |
| Yiel strength N/mm2 | Tensile strength Mpa | Elongation % in 200mm | |||
| 290 | 485-620 | 28 | |||
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