304L不锈钢轧制边裂缺陷研究  

Study on Edge Defects of Rolling 304L Stainless Steel

作　　者：韩立豪 陈家昶[3] 刘姗姗 王波[1,2] 张捷宇 Han Lihao;Chen Jiachang;Liu Shanshan;Wang Bo;Zhang Jieyu(School of Materials Science and Engineering,Shanghai University,Shanghai 200444;State Key Laboratory of Advanced Special Steel,Shanghai 200444;Baosteel Special Materials Steel Co Ltd,Shanghai 200940)

机构地区：[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

出　　处：《特殊钢》2019年第4期23-27,共5页Special Steel

基　　金：国家自然科学基金项目资助(No.51474143)

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。Vertical continuous casting is used to produce 304 L 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 304 L plate is austenite and ferrite.The crack passes through the two-phase structure and results in the compression deformation of the structure.The CaO-Si02-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.

关 键 词：304L 不锈钢 边裂 保护渣 

分 类 号：TG142.71[一般工业技术—材料科学与工程] TG335[金属学及工艺—金属材料]