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苏联最近研制成功了一种化学成分为:0.30～0.40％碳,0.30～0.50％硅,0.50～0.80％锰,12.0～1.40％铬,1.30～1.60％钼,0.40～0.60％钒的4XM2φ钢。这种新热挤压模钢在室温下的机械性能为:抗拉强度G_b=1700～1800MPa;冲击能a_k=0.3～0.45MJ/m~2。在600℃高温下的机械性能是G_b=1100～1200MPa,冲击能a_k=0.4～0.5MJ/m~2。试验结果表明,增加含碳量不可能显著地提高钢的耐热性,反而会降低钢的冲击韧性。因此,为了保证热挤压模钢的耐热性和冲击韧性,含碳量应该限制
The Soviet Union recently developed a chemical composition: 0.30 to 0.40% carbon, 0.30 to 0.50% silicon, 0.50 to 0.80% manganese, 12.0 to 1.40% chromium, 1.30 to 1.60% molybdenum, 0.40 to 0.60% vanadium 4XM2φ steel. The mechanical properties of the new hot extrusion die steel at room temperature as follows: tensile strength G_b = 1700 ~ 1800MPa; impact energy a_k = 0.3 ~ 0.45MJ / m ~ 2. The mechanical properties at 600 ℃ high temperature is G_b = 1100 ~ 1200MPa, impact energy a_k = 0.4 ~ 0.5MJ / m ~ 2. Test results show that increasing the carbon content can not significantly improve the heat resistance of steel, but will reduce the impact toughness of steel. Therefore, in order to ensure heat extrusion die steel heat resistance and impact toughness, carbon content should be limited