以工业生产的ABS-EQ47钢为对象,研究了奥氏体连续冷却相变行为,在中试工厂使用热机轧制(thermo-mechanical control process,TMCP)工艺成功开发出35 mm和40 mm厚钢板,考察了钢板经单道次模拟焊接热循环后的组织性能.结果表明,所开发钢板的组织为针状铁素体十细粒状贝氏体,屈服强度(Rp0.2)高于500 MPa,抗拉强度(Rm)高于630 MPa,伸长率(A)大于20％,在-60℃下横向Charpy冲击吸收能量(KV2)大于200J.TMCP型钢板的屈强比低于同成分调质(QT)钢板的屈强比,但其Rm高于QT型钢板.模拟焊接热输入为30 kJ/cm时,粗晶区HAZ试样的K V2不低于40J.
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