立弯式奥氏体不锈钢220mm×220mm铸坯动态二冷控制和应用

Control of Dynamic Secondary Cooling Process for Vertical-Bending 220 mm×220 mm Casting Bloom of Austenite Stainless Steel

根据奥氏体不锈钢的热物理参数和二冷区各区出口目标温度,建立了不锈钢220mm×220 mm铸坯动态二冷综合控制模型和末端拉速电磁搅拌-拉速优化模型。304奥氏体不锈钢连铸生产应用结果表明,在该钢正常工作拉速0.8~1.1 m/min,根据目标温度（足辊1 080℃,一区1 070℃,二区1 060℃,三区1 045℃,进拉矫机980℃）制定相应比水量（0.30~0.33 L/kg）,模型实时计算表面温度与目标温度对比,进行在线控制,铸坯温度均匀、稳定,冶金质量良好。

According to thermal physical parameters of austenite stainless steel and aim temperature at outlet of each section of secondary cooling area, the comprehensive control model for dynamic secondary cooling process of 220 mm × 220 mm casting bloom of stainless steel and the end electromagnetic stirring-casing speed optimized model have been estab- lished. The application results of casting production of 304 austenite stainless steel show that at normal casting speed 0. 8 - 1.1 m/rain for the steel, according to aim temperature （foot rolls 1 080 ℃, Ⅰsection 1 070 ℃, Ⅱ section 1 060 ℃, Ⅲ section 1 045 ℃ and entering straightening machine 980 ℃ ） to defining corresponding water rate （0. 30 -0. 33 L/kg）, the secondary cooling process is controlled based on comparison between calculated surface temperature by model in time and aim temperature value, as a results the temperature of casting bloom is even and stable with nice metallurgical quality.