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| Control of Subsurface Inclusion in 42CrMoAH Steel Cast by Bloom Caster |
| PANG Cong1,TANG Ping1,CHEN Shu-jun1,XU Yi-feng2,LING Chao2,ZHOU Zhi-wei2 |
（1. College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
2. Technical Center, Jiangsu Susteel Group Co., Ltd., Suzhou 215151, Jiangsu, China） |
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Abstract In order to control the subsurface inclusions existing in 42CrMoAH steel made by a 260mm×340mm bloom caster in Su Steel, the main type and origin of inclusions was analyzed, the effect of refining slag system on steel cleaness was investigated and subsurface inclusions about 40mm beneath the surface were investigated, including inclusions amount, size distribution and compositions. It shows that the inclusions are mainly deoxidation products (Al2O3) along with reoxidation products (MnO·Cr2O3, FeO·Cr2O3) and the inclusions size between 20μm and 50μm takes about 45% of the total inclusion amount. According to the result, two main factors are found to have great contributions on the bloom subsurface inclusions: poor inclusion (Al2O3) absorbing ability of refining slag; weak upward flow in the mold. Trials were conducted by increasing the basicity and w(CaO)/w(Al2O3) ratio of the refining slag and controlling the casting condition. The industrial results show that the amount of subsurface inclusions with size from 20 to 50μm is reduced about 64%.
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Received: 15 March 2013
Published: 25 November 2013
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2013, Vol. 48 
