TMCP工艺海洋平台用钢EQ51的开发

doi:10.13228/j.boyuan.issn0449-749x.20140550

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Abstract 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 kJ/cm， the plate has excellent properties at the welding joins. －55 ℃ of [tNDT] meets 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.

Received: 03 September 2014 Published: 11 June 2015

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DI Guo-Biao. Development of TMCP processed EQ51 plate steel for offshore platform[J]. Iron and Steel, 2015, 50(6): 75-80.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20140550 OR http://www.chinamet.cn/Jweb_gt/EN/Y2015/V50/I6/75

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