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针对济钢 2 0MnSi棒材曾出现断裂现象 ,从微观组织、化学成分、出钢温度以及终轧钢温度等方面进行了探讨。认为钢坯中元素含量与均匀程度是影响棒材质量的重要因素 ,并提出 2 0MnSi钢中 ,C含量最好控制在 0 .18%～ 0 .2 4 % ,Mn含量控制在 1.2 %～ 1.6 % ,Mn/Si比值控制在 3 0左右 ,S含量控制在 0 .0 2 5%以下 ;加热炉温度可控制在AC3线以上 30～ 50℃ ,固相线NSE以下 10 0～ 150℃之间 ;加热时间宜控制在 80～ 10 0min ;终轧温度在AC3线以上 50～ 10 0℃。
Aiming at the fracture phenomenon of 20MnSi bar in Jinan Iron and Steel Co., Ltd., the microstructure, chemical composition, tapping temperature and finishing steel temperature were discussed. It is concluded that the content of elements and the uniformity of the billet are important factors that affect the quality of the bar. It is suggested that the content of C should be controlled from 0.18% to 0.24% in 20MnSi steel, and the content of Mn should be controlled from 1.2% to 1.6% , The ratio of Mn / Si is controlled to about 30, and the S content is controlled below 0. 02 5%; the temperature of the heating furnace can be controlled between 30-50 ℃ above the AC3 line and between 10 ~ 150 ℃ below the NSE of the solidus line; Heating time should be controlled at 80 ~ 10 0min; finishing temperature above the AC3 line 50 ~ 10 0 ℃.