二冷强度和两种断面对82B钢铸坯中心碳偏析的影响  

Effects of secondary cooling intensity and two different cross-section on central carbon segregation of billet and bloom of 82B steel

作　　者：王韬[1] 陈伟庆[1] 闫威[1] 王宏斌[2] 张志强[2] 王建忠[2] 王广顺 曹长法 高永彬 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]宣化钢铁公司技术中心,河北宣化075100 [3]青岛钢铁公司技术中心,山东青岛266043

出　　处：《炼钢》2012年第6期55-59,共5页Steelmaking

摘　　要：研究了240 mm×180 mm的82B钢矩形坯和150 mm×150 mm的82B钢小方坯的二次枝晶臂间距和中心碳偏析情况,结果表明:相同二冷比水量下气雾冷却的冷却强度较喷水冷却的冷却强度提高1倍;对于小方坯,增加二冷比水量,二次枝晶臂间距减小,能够改善中心碳偏析;小方坯采用末端电磁搅拌,增加等轴晶改善中心碳偏析的效果优于减小二次枝晶臂间距。较大断面矩形坯比小方坯中心碳偏析明显严重,增加二冷强度对改善矩形坯中心碳偏析无明显影响,末端电磁搅拌可减少矩形坯中心碳偏析,但其偏析指数仍高于小方坯。The secondary dendrite arm spacing （SDAS） and central carbon segregation of 240 mm×180 mm bloom and 150 mm×150 mm billet of 82B are studied. Results show that under the similar condition of the secondary cooling water ratio the cooling intensity by mist cooling can be doubled than that by the spray cooling. For billets the central carbon segregation can be reduced by an increase of the secondary cooling water since the SDAS decreases with increase of the secondary cooling water. In the meanwhile the central carbon segregation of the billets can be more effectively reduced by application of F-EMS to increase the equiaxed grain ratio than by reduction of SDAS. The central car- bon segregation of bloom is usually worse than that of the billets. The central carbon segregation of the bloom can hardly be reduced by increase of the intensity of the sec- ondary cooling and the central carbon segregation of the bloom can be reduced to certain extent by application of F-EMS hut the segregation index of the hloom is still higher than that of the billet.

关 键 词：高碳钢 二次冷却 小方坯 矩形坯 二次枝晶臂间距 中心偏析 

分 类 号：TF777[冶金工程—钢铁冶金]