Abstract
AbstractThe higher strength of hot rolled steel sheet by compact strip production (CSP) process has been restricting its application in higher formability and thinner steel sheet because of higher cold rolling load. Ferrite rolling process has been widely researched since it has successfully reduced the strength of cold rolling feeds. In this paper, the microstructures and properties of a hot rolled ultra-low carbon steel SPHE by CSP process with different rolling temperatures were investigated. Strengthening mechanism was discussed by EBSD and TEM analysis. Results showed the mechanisms why the strength of the steel deformed with the finishing rolling temperature at single ferrite zone was increased while the elongation was decreased. The deformation resistance and microstructure versus temperature and the transformation behavior were analyzed. It was found that deformation at dual phase zone near to Ac1 can further increase the grain size and thus decrease the strength and meantime keep the elongation.KeywordsCSPSPHEFerrite rollingYield strength
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