摘要
采用金相显微镜对中普(邯郸)钢铁有限公司14 mm厚探伤不合的Q345R钢板进行了微观组织观察。结果显示,钢板中心偏析严重,产生了贝氏体或马氏体硬相组织,在轧后冷却过程中产生微裂纹,进而导致超声波探伤不合。在不改变连铸二冷冷却强度的前提下,通过钢板轧后缓冷,使探伤合格率明显提高。
The microstructure of 14mm thickness Q345R steel plate with unqualified flaw detection in Zhongpu(Handan)Iron and Steel Co.,Ltd.was observed by metallographic microscope.The results show that the center segregation of the steel plate is serious,resulting in bainite or martensite hard phase structure and micro-cracks in the cooling process after rolling,which leads to non conformity of ultrasonic flaw detection.On the premise of not changing the secondary cooling intensity of continuous casting,the qualified rate of flaw detection is significantly improved by slow cooling after rolling.
作者
左帅
张学慧
石晓钘
Zuo Shuai;Zhang Xuehui;Shi Xiaochuan(Zhongpu(Handan)Iron and Steel Co.,Ltd.,Wu'an 056305,Hebei)
出处
《河北冶金》
2021年第9期62-64,共3页
Hebei Metallurgy
关键词
Q345R
探伤
中心偏析
微裂纹
缓冷
Q345R
flaw detection
central segregation
micro-cracks
slow cooling
