Q355C热轧H型钢低温冲击性能不合格的原因分析与对策  

Cause Analysis and Countermeasures of Non-conformity of Low-temperature Impact Properties of Q355C Hot-rolled H-beam Steel

作　　者：张志慧 金涛 马立新 马云飞 韩小强[1] ZHANG Zhihui;JIN Tao;MA Lixin;MA Yunfei;HAN Xiaoqiang(Hebei Jinxi Iron and Steel Group Co.,Ltd,Tangshan 064307,China)

机构地区：[1]河北津西钢铁集团股份有限公司,河北唐山064307

出　　处：《热加工工艺》2020年第13期156-158,162,共4页Hot Working Technology

摘　　要：针对Q355C热轧H型钢低温冲击韧性不合格的问题,采用扫描电子显微镜、光学显微镜对其进行了显微组织及低温冲击断口形貌观察和分析。结果表明:晶粒度不均、魏氏组织及带状组织等异常组织是低温冲击性能不合格的主要原因。在生产过程中通过优化加热温度、降低终轧温度及未再结晶区控制轧制,可以极大地改善Q355C热轧H型钢低温冲击性能。Aiming at the unqualified low temperature impact toughness of Q355C hot rolled H-beam steel, the microstructure and low temperature impact fracture morphology were observed and analyzed by scanning electron microscope and optical microscope. The results show that uneven grain size, widmanstatten microstructure and banded microstructure are the main reasons for the unqualified low temperature impact properties. In the production process, the low temperature impact performance of Q355C hot-rolled H-section steel can be greatly improved by optimizing the heating temperature, reducing the final rolling temperature and controlling rolling in the non-recrystallization zone.

关 键 词：Q355C钢 热轧H型钢 低温冲击韧性 魏氏组织 带状组织 

分 类 号：TG335.42[金属学及工艺—金属压力加工]