正火温度对低合金建筑用钢性能的影响

Effect of Normalizing Temperature on Properties of Low Alloy Steel for Construction

通过在低碳钢中添加Mo、Nb以及V元素,设计了三种不同成分的低合金建筑用钢,分析了正火工艺对钢材力学性能和组织的影响,研究了其高温力学性能。结果表明:同时添加Mo、Nb以及V元素的低合金建筑用钢能获得最佳的性能;当正火温度为825℃时,其抗拉强度为545 MPa,屈服强度为452 MPa,伸长率为43.5%;650℃的高温力学性能为抗拉强度285 MPa,屈服强度196 MPa,伸长率62.7%。

Low alloy building steels with three different compositions were designed by adding elements of Mo, Nb and V in low carbon steel. The influences of normalizing process on mechanical properties and microstructure of the steels were analyzed. The high temperature mechanical properties were studied. The results show that adding Mo, Nb and V element at the same time in the low alloy building steel can achieve the best performance. When the normalizing temperature is 825 ＊C, the tensile strength is 545 MPa, yield strength is 452 MPa, and elongation is 43.5%. High temperature mechanical properties at 650℃ are the tensile strength of 285 MPa, yield strength of 196 MPa, and the elongation of 62.7%.