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《Iron and Steel》 2014-01
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Rolling Process and Microstructure and Properties of Thin Gauge Ultra-High Strength Strip Manufactured by CSP Line

CHEN Liang;ZHANG Chao;ZHU Shuai;KANG Yong-lin;Wuhan Iron and Steel Company Limited;School of Materials Science and Engineering,University of Science and Technology Beijing;  
The process and technology characteristics of CSP line were introduced. Through optimizing continuous casting and slab quality controlling,using 1 180 ℃ tapping temperature and 850-920 ℃ finishing rolling temperature,the mechanical properties of thin gauge ultra-high strength strip were analyzed based on different cooling modes and coiling temperatures. The production results show that the head continuous cooling mode is helpful to grain refinement,higher coiling temperature is beneficial to the sufficient dispersed precipitate fine TiC particles,70% of the TiC particle size is below 20 nm causing significant precipitation strengthening. The machnanical properties of thin gauge strength were affected both by fine grain strengthening caused by and cooling rate and thinner gauge and precipitation strengthening caused by coiling temperature. By optimizing cooling mode and coiling temperature,500,600 and 700 MPa strength grade strips with 1. 2-6. 0 mm thickness were developed successfully.
【CateGory Index】: TG335.5
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