FAS2271热轧圆钢超声探伤不合分析及工艺改进  

Analysis of the nonconformance of ultrasonic testing and technology improvement for FAS2271 hot rolled steel bars

作　　者：马群[1] 冯桂萍[1] 赵智刚[1] 李刚 顾文涛[1] 康湉 MA Qun;FENG Gui-ping;ZHAO Zhi-gang;LI Gang;GU Wen-tao;KANG Tian(Technology Center,Fushun Special Steel Co.,Ltd.,Fushun 113001,China;Continuous Rolling Works,Fushun Special Steel Co.,Ltd.,Fushun 113001,China)

机构地区：[1]抚顺特殊钢股份有限公司技术中心,辽宁抚顺113001 [2]抚顺特殊钢股份有限公司连轧厂,辽宁抚顺113001

出　　处：《物理测试》2018年第4期42-45,共4页Physics Examination and Testing

摘　　要：针对FAS2271热轧圆钢在超声探伤中检出的心部裂纹缺陷,采用金相显微镜对裂纹试样进行观察和分析,结果表明,FAS2271热轧圆钢心部裂纹的产生,主要是由于钢坯加热未充分透烧所致,同时钢材轧后冷却快,且直接矫直,应力叠加,进一步增加了心部开裂的倾向。通过改进钢坯加热及钢材轧后缓冷工艺,包括提高加热温度,控制钢坯出速以保证均热保温时间,增加轧后进坑缓冷工艺,探伤不合发生率由14%降低至0.15%,改善显著。Core cracks were detected in FAS2271 hot rolled steel round bars during ultrasonic testing. Samples were then taken from non-conformance steel bars,and analyzed by metallographic microscope. The results showed that the core cracks of FAS2271 hot rolled steel round bars were mainly caused by non equalization heating during the heating of billets,and meanwhile,because the cooling speed was fast after rolling,and steel bars were directly straightened,strain overlaid,the risk of core cracking was increased. By improving the processes of billets heating and slowing the cooling process of steel bars after rolling,which included increasing the heating temperature,controlling the pulling speed of billets and adding the process of pit cooling after rolling,the nonconformance ratio of ultrasonic testing was lowered obviously from 14 percent to 0.15 percent.

关 键 词：FAS2271钢 超声探伤 心部开裂 工艺改进 

分 类 号：TG115.285[金属学及工艺—物理冶金]