冷轧板中夹杂类孔洞缺陷的形成原因.pdfVIP

第 39 卷第 10 期 理化检验物理分册 Oct. 39 　No. 10 2003 年 10 月 PTCA ( ) Sep. 2003 PART A : PHYSICAL TESTING 试验研究 冷轧板中夹杂类孔洞缺陷的形成原因 方淑芳 (攀钢钢铁研究院 , 攀枝花 617000) 摘 　要 : 对冷轧板中夹杂类孔洞缺陷的宏观及微观特征进行了分析。认为夹杂类孔洞是由于 基板中存在着聚集状夹杂、大型夹杂、分层等缺陷导致基板不能连续变形所致。对夹杂物来源、连 铸坯缺陷、冶炼和连铸浇注工艺进行了调查 ,发现敞浇、供钢节奏紧张时易采取的非常规操作是导 致连铸坯中大型夹杂等各类缺陷形成的主要原因。现场验证结果证明 , 敞浇与非常规操作因素叠 加时 ,使连铸坯冷轧板产生孔洞的几率明显增加。因此 ,要杜绝冷轧板中夹杂类孔洞缺陷还需从 控制连铸浇注环节着手。 关键词 : 冷轧板 ; 夹杂类孔洞 ; 形成原因 ( ) 中图分类号: TG335. 5 　　　文献标识码 : A 　　　文章编号 : 2003 FORMATION OF THE CAVITY DEFECT INDUCED BY INCLUSIONS FANG Shufang ( ) Panzhihua Iron and Steel Institute , Panzhihua 617000 , China Abstract : The macroexamination and microexamintion of the characteristics of the cavity defect induced by inclusions in cold rolled sheet were carried out. The results showed that this cavity formed due to uncontinuous deformation in the basis materials which have the inclusions. According the characteristics of the cavity , the inclusion’s resource , defects in continuous slag , the process of steelmaking and continuous casting were investigated. It is found that the open casting and various anomalous operation factors are the main reasons of the inclusion increased in the slabs. When both factors act at the same time , the more cavity de fects were happened in the cold rolled sheet. Keywords : Cold rolled sheet ; Cavity induced by inclusions ; Formation reason