Transactions of Materials and Heat Treatment

Title：Influence of coiling temperature on microstructure and properties for low carbon steel rolled by CSP ferrite

Authors： Wang Chengjian Hu Xuewen Peng Huan Wu Zhiwen Yu Xuanxun

Unit： Technology Center Ma′anshan Iron and Steel Co. Ltd.

KeyWords： coiling temperature ferrite rolling microstructure mechanical properties dislocation

ClassificationCode：TG335.1

year,vol(issue):pagenumber：2022,47(9):158-162

Abstract：

Low carbon steel was produced by CSP ferrite rolling process under different coiling temperatures, and the influences of coiling temperature on the microstructure and properties of CSP ferrite-rolled low carbon steel were studied by microstructure, micro-precipitation, dislocation density and performance tests. The research results show that the sample structure is composed of coarser ferrite and a small amount of pearlite, the precipitates are oxides or nitrides of Al, Ti and Si, and some are also compounded with MnS. When the coiling temperature drops from 700 °C to 620 °C, the yield strength and the tensile strength increase by 31.6 and 25.9 MPa, respectively, and the hardness fluctuation range increases from 12 HRB to 25 HRB. Thus, increasing the coiling temperature can promote the growth and homogenization of ferrite grains, reduce the dislocation density, effectively reduce the strength and improve the uniformity of performance.

Funds：

安徽省科技重大专项资助项目（18030901075）

王承剑（1992-），男，硕士，工程师 E-mail：15949551089@163.com

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