Generation mechanism of large inclusions during bearing steels refining process by tracer method
LIU Liu1，FAN Jian-wen1，WANG Pin2，WANG Le1
（1. China Iron and Steel Research Institute Group， Beijing 100081， China 2. Metallurgical Technology Institute， Central Iron and Steel Research Institute， Beijing 100081， China 3. Steelworks， Hubei Xinyegang Steel Co.， Ltd.， Huangshi 435001， Hubei， China）
Abstract：The generation mechanism of large size non-metallic inclusions has been studied by the method of adding tracer agent into the refining slag during Ladle Refining process. The results show that the large size inclusions in the high carbon chromium bearing steels mainly originate from primary de-oxidation reaction， intrinsic reaction and refining slag mixing. The three type inclusions occupy 10%-15% of all the oxides， 25%-40% and 50%-60% respectively. The primary de-oxidation inclusions linger in liquid metal without contact with the slag， therefore their contents have no BaO. The intrinsic reaction inclusions originate from interface reaction between steel and slag， and the BaO content of the inclusions increases with the refining process going on. By the refining process without slag， such as RH process， the formation of inner formed inclusions can be hold back. The slag-mixing inclusions originate from liquid steel stirring and most of them have some BaO. The size of the inclusions decreases with the refining process going on. Therefore， the methods for decreasing the number of large size inclusions are as follows， confining strictly the oxygen activity， a0，before deoxidizing process， decreasing[w(T[O])]in liquid metal， weakening and even avoiding slag-metal interface reactions and decreasing the reduction potential ability of slag as possible， and optimizing the liquid metal stirring intensity to decrease the slag involving and promote the tiny inclusions coagulating and floating upwards and being absorbed by the refining slag.
收稿日期: 2016-12-23
出版日期: 2017-09-07
引用本文:
刘 浏，范建文，王 品，王 乐. 轴承钢精炼中大型夹杂物来源的示踪[J]. 钢铁, 2017, 52(9): 34-41.
LIU Liu，FAN Jian-wen，WANG Pin，WANG Le. Generation mechanism of large inclusions during bearing steels refining process by tracer method. Iron and Steel, 2017, 52(9): 34-41.
2017, Vol. 52 
