Experimental study on thin gauge Mn-Ti microalloying cold-rolled high strength IF steel
Aiming at the problems of heavy rolling load and high rolling difficulty in thin cold-rolled high-strength IF steel,the design of Mn-Ti micro-alloying high-strength IF steel was developed.By adding manganese element,the effect of strengthening and reducing Ar3 of the austenite to ferrite transition temperature was played,so that the hot rolled steel could still be rolled in the austenite zone at a lower temperature,avoiding the rapid temperature drop due to thin rolling thickness.As a result,the finishing stage of hot rolling is completed in the two-phase zone,resulting in quality problems.In this experiment,two components of high manganese and conventional high phosphorus were designed to compare,and a hot-rolling,cold-rolling,anneal-flattening process test was carried out.The Ar3 tem-perature was analyzed by JMatPro calculation,high-temperature dilatometers to measure volume changes,and DSC to measure heat changes.Based on this,the hot rolling final rolling temperature was set to ensure the completion of the hot rolling process in the austenite zone.The results show that compared with the conventional high-phosphorus design,the Ar3 temperature is reduced by at least 48 ℃,and the austenite zone is still rolling when the hot rolling final rolling temperature is 860 ℃.The austenite rolling method can be used to roll 2.2 mm thick high-strength IF steel in hot rolling.At the same time,the use of high-Mn design of high-strength IF steel reduces the cold rolling force,improves the cold rolling speed,reduces the difficulty of cold rolling,and the mechanical properties of the finished products after annealing are similar.This design idea provides a possibility for rolling thinner high-strength IF steel.
high strength IF steelthin gaugehigh manganeseaustenite
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