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通过研究轧制温度、冷却速度和终冷温度对显微组织和力学性能的影响,最终确定了EQ51的最佳控轧控冷工艺参数。试验结果表明,当冷却速度不小于5℃/s时,有利于抑制多边形铁素体相变,促进针状铁素体和粒状贝氏体相变;为了避免两相区轧制出现混晶现象,终轧温度控制为790℃;终冷温度为570℃时,所得显微组织为针状铁素体和粒状贝氏体;经工业轧制的TMCP工艺EQ51钢板强韧性良好;当焊接输入线能量为50 k J/cm时,焊接接头性能优异;落锤性能的tNDT为-55℃,满足船级社规范的低温韧性要求。开发的钢板获得了ABS船级社认证证书,并成功应用于某船厂自升式平台CJ50项目。
By studying the influence of rolling temperature, cooling rate and finishing temperature on the microstructure and mechanical properties, the optimal control parameters of EQ51 were finally determined. The experimental results show that when the cooling rate is not less than 5 ℃ / s, it is advantageous to inhibit the polygonal ferrite transformation and promote the acicular ferrite and granular bainite transformation. In order to avoid the mixed crystal in the two-phase rolling, , The final rolling temperature control is 790 ℃; when the final cooling temperature is 570 ℃, the obtained microstructure is acicular ferrite and granular bainite; The TMCP technology TMQ steel plate after industrial rolling has good toughness; when the welding input line Excellent weld joint performance at 50 kJ / cm energy; tNDT for drop weight performance of -55 ° C to meet the cryogenic toughness requirements of classification societies. The developed steel has obtained the ABS classification society certification and has been successfully applied to the CJ50 project of a shipyard jack-up platform.