Study on Edge Defects of Rolling 304L Stainless Steel

Special Steel ›› 2019, Vol. 40 ›› Issue (4): 23-27.

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Study on Edge Defects of Rolling 304L Stainless Steel

Han Lihao^1,2 ,Chen Jiachang³, Liu Shanshan^1,2, Wang Bo^1,2, Zhang Jieyu^1,2

1 School of Materials Science and Engineering, Shanghai University, Shanghai 200444 ；
2 State Key Laboratory of Advanced Special Steel, Shanghai 200444;
3 Baosteel Special Materials Steel Co Ltd, Shanghai 200940

Received:2018-02-15 Online:2019-08-01 Published:2022-05-14

304L不锈钢轧制边裂缺陷研究

韩立豪^1,2,陈家昶³,刘姗姗^1,2,王波^1,2,张捷宇^1,2

1上海大学材料科学与工程学院，上海200444 ；
2省部共建高品质特殊钢冶金与制备国家重点试验室，上海200444 ；
3宝钢特钢有限公司，上海200940

作者简介:韩立豪(1993-)，男，硕士研究生，(2016年上海大学).2016年内蒙古科技大学(本科)毕业,340L不锈钢质量与工艺研究。
基金资助:
国家自然科学基金项目资助(No.51474143)

Abstract

Abstract: Vertical continuous casting is used to produce 304L stainless steel in a domestic plant, but edge cracks are easy to form in the rolling process. By means of chemical composition analysis, microstructural observation, energy spectrum analysis and high temperature mechanical properties testing, the structure fracture morphology and inclusions at the edge cracks of steel were studied. The results show that the structure of hot rolled 304L plate is austenite and ferrite. The crack passes through the two-phase structure and results in the compression deformation of the structure. The CaO-SiO₂-Al₂O₃- MgO composite inclusions are contained and the inclusions contain Na and K elements. Finally, it is found that the mould powder entrapped in the production process is the cause of edge cracks in hot rolling plate.

摘要： 钢厂采用立式连铸生产304L不锈钢,但在轧制过程中易出现边裂现象。本文采用化学成分分析、微观组织观察、能谱分析及高温力学性能检测等手段,对钢材组织、边裂部位的断裂形貌以及断裂部位存在的夹杂物进行了研究。结果表明304L热轧板的组织为奥氏体和铁素体。裂纹穿过两相组织并导致组织的压缩变形。裂纹内含有CaO-SiO₂-Al₂0₃-MgO复合型夹杂物,夹杂物含有Na元素和K元素。最终确定在生产过程中卷进的保护渣是导致钢材产生轧制边裂的原因。

关键词: 304L不锈钢, 边裂, 保护渣

Han Lihao, Chen Jiachang, Liu Shanshan, Wang Bo, Zhang Jieyu, . Study on Edge Defects of Rolling 304L Stainless Steel[J]. Special Steel, 2019, 40(4): 23-27.

韩立豪, 陈家昶, 刘姗姗, 王波, 张捷宇. 304L不锈钢轧制边裂缺陷研究[J]. 特殊钢, 2019, 40(4): 23-27.

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Study on Edge Defects of Rolling 304L Stainless Steel

304L不锈钢轧制边裂缺陷研究

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