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| 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） |
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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.
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Received: 23 December 2016
Published: 07 September 2017
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| [1] |
川上 潔, 軸受鋼の清浄化, 第182,183回西山記念技術講座, 2004年10, 11月, 159.
|
| [1] |
川上 潔, 軸受鋼の清浄化, 第182,183回西山記念技術講座, 2004年10, 11月, 159.
|
| [2] |
土井健司,折橋英行,松島義武等, 長寿命軸受鋼の開発, 神戸製鋼技報, Vol.50, No.1, Apr.2000, 49-52.
|
| [2] |
土井健司,折橋英行,松島義武等, 長寿命軸受鋼の開発, 神戸製鋼技報, Vol.50, No.1, Apr.2000, 49-52.
|
| [3] |
製品紹介, 超高清浄度鋼：SP鋼の鋼種特性と部品展開, Sanyo Technical Report, Vol.13 (2006), No.1, 77-78.
|
| [3] |
製品紹介, 超高清浄度鋼：SP鋼の鋼種特性と部品展開, Sanyo Technical Report, Vol.13 (2006), No.1, 77-78.
|
| [4] |
太田裕己, 木村世意, 三村 毅等, 超清浄軸受鋼の取鍋精錬時におけるCaO含有介在物の挙動, KOBE STEEL ENGINEERING REPORTS, Vol.61, No.1, Apr.2011, 98-101.
|
| [4] |
太田裕己, 木村世意, 三村 毅等, 超清浄軸受鋼の取鍋精錬時におけるCaO含有介在物の挙動, KOBE STEEL ENGINEERING REPORTS, Vol.61, No.1, Apr.2011, 98-101.
|
| [5] |
川上 潔, 高清浄度鋼における介在物の生成起源, Sanyo Technical Report, Vol.14 (2007), No.1, 22-35.
|
| [5] |
川上 潔, 高清浄度鋼における介在物の生成起源, Sanyo Technical Report, Vol.14 (2007), No.1, 22-35.
|
|
|
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2017, Vol. 52 
