模具钢4Cr5MoSiV1超声探伤缺陷的分析和工艺改进
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摘要
山钢特钢事业部新区采用铁水+废钢→100 t电弧炉→双工位LF→双工位VD→圆坯连铸(Φ500 mm断面)→步进式加热炉→950轧机轧制的流程生产模具钢4Cr5MoSiV1,个别批次的4Cr5MoSiV1模具钢存在探伤不合格缺陷,通过对该批次探伤不合格缺陷部位运用超声波进行定位,对所取试样进行金相和扫描电镜分析,最终确认了铸坯的心部缺陷及轧制压缩比小,是造成该批次4Cr5MoSiV1钢探伤不合格的主要原因,并提出了相应的改进措施。
The die steel 4 Cr5 MoSiV1 was produced with the path of hot metal + scrap → 100 t EAF → double LF →double VD → round billet continuous casting(section Φ500 mm)→step reheating furnace→950 rolling mill,in the special steel division new district of Shandong Steel. There are defects in the detection of individual batches die steel 4 Cr5 MoSiV1.By using the ultrasonic testing to locate the defect location, and analyzing with the way of Metallographic analysis and scanning electron microscopy(SEM), finally confirmed the center defect and the rolling compression ratio small are the main reasons of the testing substandard batch of steel 4 Cr5 MoSiV1, and the corresponding improved measures are put forward.
The die steel 4 Cr5 MoSiV1 was produced with the path of hot metal + scrap → 100 t EAF → double LF →double VD → round billet continuous casting(section Φ500 mm)→step reheating furnace→950 rolling mill,in the special steel division new district of Shandong Steel. There are defects in the detection of individual batches die steel 4 Cr5 MoSiV1.By using the ultrasonic testing to locate the defect location, and analyzing with the way of Metallographic analysis and scanning electron microscopy(SEM), finally confirmed the center defect and the rolling compression ratio small are the main reasons of the testing substandard batch of steel 4 Cr5 MoSiV1, and the corresponding improved measures are put forward.
引文
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[3]张海军.钢板探伤不合原因分析[J].宽厚板,2002,8(1):12-16.
[4]李婧,邵长静,刘相华,等.Q345高强度宽厚钢板探伤缺陷原因及分析[J].材料热处理学报,2015,36(5):117-122.
[5]姜锡山.连铸钢缺陷分析与对策[M].北京:机械工业出版社,2011:129-141.
[6]黄军,何广霞,吴扬,等.塑料模具钢厚板探伤不合原因分析及改进措施[J].特钢技术,2017,23(1):24-26.
[7]李连任,刘德红,毕于顺,等.厚规格压力容器板探伤不合格原因分析与改进措施[J].天津冶金,2011,30(2):46-48.
[8]张志宏,刘军利,刘伟平.大圆坯中心偏析成因解析及质量控制[J].钢铁,2013,29(2):19-21.
[9]贾希光.30CrMo合金钢板探伤不合格原因探讨及改进措施[J].宽厚板,2016,22(3):25-28.