摘要:
通过合理设计化学成分,借助控轧控冷工艺,成功开发出了含钒高强度耐候钢板Q450NQR1,实验室检测结果表明:钢板的组织为铁素体+少量珠光体,平均晶粒度为12级;力学性能符合试验要求,屈服强度平均值493.57MPa,抗拉强度平均值599.00 MPa,屈强比平均值0.823 9,断后延伸率平均值30.21%,在-80℃和-40℃条件下,3/4尺寸的V型缺口冲击试样的吸收能分别达到51.6 J和9297 J;与Q345B相比,72 h周期浸润试验后相对Q345B的腐蚀率为44.47%,144h周期浸润试验后的相对Q345B的腐蚀率达34.06%,满足供货要求。
Abstract:
The high strength weathering steel Q450 NQR1 contaning vanadium was developed through TMCP process. Laboratory test results indicate that the microstructure of plate is ferrite-pearlite and grain size rating is ASTM No. 12,the yield strength,tensile strength,yielding-to-tensile ratio and specific elongation are 493.57 MPa,599.00 MPa,0.823 9,30.21%,respectively. The impact absorbing energy at -80℃ and -40 ℃ are 51.6 J and about 92 ~97 J,respectively. The corrosion rate for 72 hours and 144 hours are 44.47% and 34.06% compared with the Q345 B,respectively. The developed steel can meet the requirement for the railway boxcar.
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