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Title:Influences of refining and rolling process on microstructure and properties of hot rolled strip SPHC
Authors: Yue Chongxiang  Li Hui  Wu Shengjie  Li Hualong 
Unit: Institute of Research of Iron and Steel  Shasteel 
KeyWords: SPHC  refining technology rolling technology of steel inclusion heterogenous grain 
ClassificationCode:TG142.1
year,vol(issue):pagenumber:2017,42(12):135-139
Abstract:

 The influences of refining and rolling process on the microstructure and properties of hot rolled strip SPHC were studied by industrial tests. The results show that compared with the RH refining, the amount of inclusions formed in the plate produced by the LF refining is obviously increased, and these inclusions are more likely to be the source of cracks. Therefore, the LF or RH refining can be used to produce SPHC hot rolled structural plate, and the RH refining is recommended to produce SPHC hot rolled stamping plate. Finish rolling temperature and coiling temperature have significant impacts on the microstructures and properties of SPHC hot rolled strip. However, the cross section microstructure in the SPHC hot rolled strip depends on finish rolling and coiling temperatures, and heterogenous grains are easily formed in the surface and edge areas of the strip when finish rolling and coiling temperatures are low. By increasing finish rolling temperature to 890 ℃, heterogenous grains can be controlled within the range of 40 mm from the edge. Thus, under the condition of appropriate finish rolling temperature and coiling temperature, the two-stage cooling ensures a sufficient growth of equiaxed ferrite grains and C precipitation, which is beneficial for improving the stamping performance of steel.

 
Funds:
江苏沙钢集团资助项目(IRIS-SS1404)
AuthorIntro:
作者简介:岳重祥(1982-),男,博士,高级工程师 E-mail:chongxiang39@163.com
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