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航结钢五个钢种,由氧化法改为直腐法检查奥氏体晶粒度后,合格率曾显著下降到70%左右,为了解决此问题,并根据7912会议精神进行了攻关;查阅了资料,[1、2、3、4]开展了试验研究。我们试验工作结果已证明,有效酸溶铝含量为0.02～0.05%,38CrMoAl含Al量在中下限是必要条件[5]; “双高”工艺是重要工艺因素;予处理是调整奥氏体晶粒度有效办法,进而证明:高温调质型效果最好,正火+回火效果很好、铁素体高温区回火效果好[6]。由于完善和强化了这些工艺,晶粒度合格率曾达到100%,一次合格率也达到90%以上,本文主要总结热轧“双高”工艺的效果。
In order to solve this problem and pass the spirit of the 7912 Meeting, the five steel grades of HangZhengGu were changed from oxidation method to direct-rot method to check the grain size of austenite. The inspection rate was significantly reduced to 70% The data, [1,2,3,4] conducted a pilot study. The results of our experimental work have proved that effective acid-soluble aluminum content of 0.02 to 0.05%, 38CrMoAl Al content in the lower and middle limits is a necessary condition [5]; “double high” process is an important process factor; pretreatment is to adjust the austenite The results show that the effect of quenching and tempering at high temperature is best, the effect of normalizing and tempering is very good, and the tempering effect of high temperature ferrite is good [6]. Due to the improvement and strengthening of these processes, the grain size pass rate has reached 100%, a pass rate of 90% or more, this paper summarizes the hot-rolled “double high ” effect of the process.