H型连铸坯表面温度评析

Analysis on the surface temperature of a beam blank

采用CIT-M型红外测温线性化传感器，测定马钢SS400异型坯在连铸过程中的表面温度；Gleeble-2000热力模拟试验机测定SS400的高温塑性，结果表明：SS400异型坯表面温度在二冷区和矫直时大部分处于低温脆性区760～880℃，铸坯的表面塑性较差；同时，由于二冷2段支撑辊间间隔喷水，铸坯表面温度回复大，远大于连铸二冷配水冶金规则所允许的最大幅度100℃·m^(-1)．

The surface temperature of an SS400 beam blank was measured with an CIT-M Infrared Pyrometer and the hot ductility of SS400 steel was tested in a Gleeble-2000 thermomechanical simulator. The results showed that the surface temperatures of the SS400 beam blank in the secondary cooling area and at the straightening places were normally in 760-880℃, i.e., the fragile temperature range of SS400 steel. The rebounds of surface temperature between some supporting rollers in the second segment of secondary cooling area, caused by discontinuously water spraying, were higher than the permitted range 100℃ ·m^-1 according to the metallurgical rules for secondary cooling.