为了提高石油输送管线钢的等级及韧性,对超低碳微合金钢通过控制轧制后的三阶段冷却,在实验室试制了X100高钢级管线钢,并对其显微组织与力学性能进行了分析.结果表明:试验钢在拉伸过程中没有明显的屈服点,屈服强度达770 MPa,屈强比为0.80,伸长率达到21.3%,-20℃冲击功为179 J,均符合标准要求,具有良好的综合力学性能;试验钢在冷却过程中发生了位错回复、亚晶形成、形变诱导析出、针状铁素体以及板条贝氏体的转变、析出物长大和碳化物偏聚等,形成了针状铁素体和贝氏体双相组织为主及部分M-A岛和孪晶的显微组织.
参考文献
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