738塑料模具钢板探伤缺陷分析及改善措施  

Analysis and Improvement Measures of Detected Defect for 738 Plastic Mold Steel Plate

作　　者：宋延成 孙宪进 吴扬 张奇毅 Song Yancheng;Sun Xianjin;Wu Yang;Zhang Qiyi(Special Plate and Steelmaking Branch of Jiangyin Xingcheng Special Steel Works Co.,Ltd.;Research Institute of Jiangyin Xingcheng Special Steel Works Co.,Ltd.)

机构地区：[1]江阴兴澄特种钢铁有限公司特板炼钢分厂 [2]江阴兴澄特种钢铁有限公司研究院

出　　处：《宽厚板》2023年第2期9-12,34,共5页Wide and Heavy Plate

摘　　要：为了提高738模具钢厚板内部探伤质量,采用酸浸低倍、金相检验、原位分析等手段,对探伤缺陷处进行取样分析,结果表明钢板内部严重的成分偏析和疏松是导致探伤缺陷的主要原因。通过优化连铸和轧制工艺,738模具钢板坯的低倍质量明显改善,轧制的200 mm厚度钢板达到锻件Φ2 mm超声波探伤等级要求。In order to improve internal flaw detection quality of 738 mold steel,the sample is taken from the detected defect position and analysed by means of acid dip etching macro-examination,metallographic examination and original position analysis.The results show that severe composition segregation and looseness inside steel plate are the major causes leading to detected defect.By optimizing the continuous casting and rolling process,the macrostructure quality of 738 mold steel slab has been significantly improved,and the as-rolled 200 mm thick steel plate has reached the forgingΦ2 mm ultrasonic flaw detection level requirements.

关 键 词：模具钢 厚板 探伤缺陷 偏析 疏松 

分 类 号：TG142.1[一般工业技术—材料科学与工程]