TMCP工艺海洋平台用钢EQ51的开发  

Development of TMCP processed EQ51 plate steel for offshore platform

作　　者：狄国标[1] 杨永达[1] 麻庆申[1] 王彦锋[1] 沈钦义[1] 

机构地区：[1]首钢技术研究院宽厚板所,北京100041

出　　处：《钢铁》2015年第6期75-80,共6页Iron and Steel

摘　　要：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。The optimal TMCP（thermo-mechanical controlled process） parameters are determined by investigating on the effect of rolling temperature,cooling rate and final cooling temperature on microstructure and mechanical properties. Results show that,at cooling rate≥5 ℃/s,polygonal ferrite is suppressed while the acicular ferrite and granular bainite are promoted. In order to avoid rolling in dual-phase region,finish rolling temperature is set as 790 ℃. When final cooling temperature is 570 ℃,the obtained microstructure is acicular ferrite and granular bainite. The industrial produced EQ51 steel plate has achieved good combination of strength and ductility. When the welding heat input reaches 50 k J/cm,the plate has excellent properties at the welding joins.-55 ℃ of tNDTmeets the requirements of low temperature toughness from the rules of classification society. The product of EQ51 has obtained ABS certification. It was then successfully applied to jack-up platform CJ50 project.

关 键 词：海洋平台 冷却速度 针状铁素体 力学性能 

分 类 号：TG142.1[一般工业技术—材料科学与工程] TG335[金属学及工艺—金属材料]