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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(thermomechanical control process,TMCP)工艺成功开发出35mm和40mm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+细粒状贝氏体,屈服强度(Rp0.2)高于500MPa,抗拉强度(Rm)高于630MPa,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30kJ/cm时,粗晶区HAZ试样的KV2不低于40J。
The industrial production of ABS-EQ47 steel was studied. The austenite continuous cooling transformation behavior was studied. The 35mm and 40mm thick steel plates were successfully developed in the pilot plant using the thermomechanical control process (TMCP) Tissue properties after single pass simulation of thermal cycling. The results show that the microstructure of the developed steel plate is acicular ferrite + fine granular bainite. The yield strength (Rp0.2) is higher than 500MPa, the tensile strength (Rm) is higher than 630MPa and the elongation (A) is greater than 20 %, The transverse Charpy impact absorption energy (KV2) is greater than 200 J at -60 ° C. The yield ratio of TMCP steel is lower than that of QT steel, but its Rm is higher than that of QT steel. When the simulated welding heat input is 30 kJ / cm, the KV2 of the coarse-grained HAZ sample is not less than 40J.