低碳当量微铌合金化Q390厚板开发  

Development of Low-Mn-trace-Nb Heavy Plate by Thermomechanical Control Process

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作  者:罗龙飞 刘鹏 刘卫丽 LUO Long-fei;LIU Peng;LIU Wei-li(Baosteel Zhanjiang iron and Steel Co.,Ltd.,Zhanjiang,Guangdong,524072,P.R.China)

机构地区:[1]宝钢湛江钢铁有限公司,广东湛江524072

出  处:《南方金属》2025年第2期14-17,共4页Southern Metals

摘  要:通过TMCP工艺细化晶粒,辅以C、Mn、Nb等元素的固溶强化和析出强化,成功开发了低碳当量微铌合金化Q390厚板。相比低温干轧+轧后空冷工艺生产的钢板,控轧控冷工艺生产的钢板铁素体和珠光体晶粒更细,带状组织明显改善,强韧匹配更佳。该工艺具有C含量适中、CEV低、Mn含量低的特点,其碳当量仅0.33%左右,显著低于Q390标准要求的碳当量上限0.45~0.48%,可避免MnS偏析对钢质和焊接性能的影响,确保其焊接性能优良。A low CEV micro niobium alloyed plate Q390 was successfully developed by refining grain size through TMCP,supplemented by solid solution strengthening and precipitation strengthening effects of elements such as C,Mn and Nb.Compared with steel plates rolled at low-temperature and cooled in air,steel plates produced by TMCP have finer ferrite and pearlite grains,lower banded structure grade and better matching of strength and toughness.This process has the characteristics of moderate C content,low CEV,and low Mn content.Its CEV is only about 0.33%,significantly lower than the upper limit of standard Q390 which sets 0.45-0.48%.It can avoid the impact of MnS segregation and other factors on steel quality and welding performance,ensuring excellent welding performance.

关 键 词:低碳当量 微铌合金化 Q390 控轧控冷 显微组织 

分 类 号:TG156.1[金属学及工艺—热处理]

 

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