建筑抗震用低屈服点钢LY225的开发

试验用LY225钢(/%:0.07C,0.05Si,0.50Mn,0.007P,0.008S,0.005 0N)由500 kg真空感应炉熔炼,浇铸成210 mm坯,并热轧成25 mm和40 mm板,终轧温度790~830℃水冷。LY225钢板经880~900℃正火后的组织为多边形铁素体,晶粒度为7.5~8.5级,屈服强度225~234 MPa,0℃下冲击性能285~294 J,具有良好的高应变低周疲劳性能和焊接性能,满足GB/T28905-2012对LY225级建筑抗震用低屈服点钢力学性能的要求。