【摘 要】
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The flow stress under typical hot coiling conditions has been quantified for low C and Nb-Ti(V)microalloyed steels.The equation is intended for calculating the amount of bending torque required during
【机 构】
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Dept. of Materials Science and Met. Eng. University of Pretoria
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The flow stress under typical hot coiling conditions has been quantified for low C and Nb-Ti(V)microalloyed steels.The equation is intended for calculating the amount of bending torque required during coiling,particularly for thick,microalloyed skelp,so as to optimally adjust the coiler tension settings.Simplified rolling,runout table(ROT),and coiling simulations,typical for 10mm strip were performed.A small plastic strain was applied during the coiling stage to study flow behaviour in the ferrite and two-phase regions.The flow stress equation developed is applicable for the following chemistry limits: 0-0.09%Nb,0.25-1.59%Mn,0.06-0.16%C,0-0.25%Si,0-0.02%Ti and 0-0.07%V.Dilatometry measurements showed that,at high coiling temperatures,a significant fraction of untransformed austenite was often present during coiling.The most significant variables contributing to flow stress in the coiling region in decreasing order are: strain,Nb content,temperature and Mn content.
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