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effect of sulphur on steel property
met.
硫对钢性能的影响
(【技】硫是钢中的有害元素。当钢的热加工或焊接温度达到 800 ~ 985°C 时,晶界趋脆,易于断裂。当钢在 985°C 以上温度加热或热加工时,由于硫化物共晶体熔化破坏晶粒之间的结合,使钢在985 - 1200°热加工时沿晶界产生破裂。在轧制过程中,硫化铁将沿轧制方向呈条状伸长,不仅使钢材起层,而且在硫化物夹杂尖端处引起应力集中,降低钢材的冲击韧性、疲劳强度和耐腐蚀能力。同时,硫是钢中偏析最严重的杂质之一,其危害性随偏析的严重程度增大而增大。)
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