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| Investigation on Production of High Purity Hot Forging Steels for Automotives |
| LIU Shihong1,2，WANG Xinhua1，DAI Guanwen2，LIANG Mei2，LI Hong1 |
| 1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083，China;2. Shijiazhuang Iron and Steel Co., Ltd., Shijiazhuang 050031,Hebei,China |
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Abstract High purity hot forged steel for automotives with 0.005% of w(［P］) and less than 0.001% w（T［O］） has been produced by means of increasing hot metal charging ratio, strengthening dephosphurization in EAF, strong direct and indirect deoxidations, etc. It was found that more segregations of C, P, S and Mn occurred at the boundaries between the columnar grains and equiaxed grains. There were mainly two types of nonmetallic inclusions in the steels, which were the MnSMnO typed inclusions and TiNVN typed inclusions. The MnSMnO type inclusions contained 70%81% MnS and were plastic inclusions. While, the TiNVN type inclusions contained 72%85% TiN and were unformable inclusions during hot deformation.
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Received: 01 January 1900
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2007, Vol. 42 
