S650MC高强钢连铸轻压下工艺优化  

Optimization of continuous casting soft reduction process for S650MC high strength steel

作　　者：刘启龙[1,2] 刘国平[2] 司小明[2] 王志政[2] 曹成虎[2] LIU Qilong LIU Guoping SI Xiaoming WANG Zhizheng CAO Chenghu(National Engineering Research Center of Continuous Casting Technology, Central Iron and Steel Research Institute, Beijing 100081, China No. 4 Steelmaking and Rolling General Plant of Maanshan Iron and Steel Co., Ltd., Maanshan 243011, China)

机构地区：[1]钢铁研究总院连铸技术国家工程研究中心,北京100081 [2]马鞍山钢铁股份有限公司第四钢轧总厂,安徽马鞍山243011

出　　处：《炼钢》2017年第4期52-57,共6页Steelmaking

摘　　要：为解决S650MC钢热轧卷拉伸试样出现一定比例的分层问题,针对影响拉伸分层主要原因之一的铸坯中心偏析质量进行了动态轻压下工艺优化试验。结果表明:在固相率为20%~75%压下区间,压下量由3.6 mm提高至4.4 mm;总压下量由4.5 mm提高至5.5 mm的工艺方案能显著提高其中心偏析质量;S650MC钢铸坯中心偏析评级由原来的平均B1.0级提高至C1.0级,热轧卷拉伸试样出现分层比例由4.20%下降至0.78%。同时也表明二冷电磁辊对S650MC钢中心偏析质量改善效果不明显,但能提高铸坯中心等轴晶比例2%~3%。For resolved the problem of the S650 MC steel hot rolled coil has a certain percentage of lamination,one of the main reasons of the tensile lamination is the slab center segregation,the process optimization experiment was carried out. The result showed that： the amount of reduction was increased from3. 6 mm to 4. 4 mm in the fs= 20 %-75 % reduction zone,the total amount of reduction was increased from 4. 5 mm to 5. 5 mm,this optimal process project could significantly improve the quality of center segregation. The average center segregation etching grade of S650 MC steel was improved from B1. 0 to C1. 0. The rate of the tensile lamination was decreased from 4. 20 % to 0. 78 %. Meanwhile,showed that the effect of improving S650 MC steel center segregation quality by S-EMS was not obvious,but the equiaxed grain ratio of slab can increase about 2 %-3 %.

关 键 词：S650MC钢 拉伸分层 轻压下 中心偏析 

分 类 号：TF777[冶金工程—钢铁冶金]