热轧冷却工艺对含铜Hi-B钢抑制剂的影响

模拟CSP工艺试制的含铜Hi-B取向硅钢（/%:0.06C,3.38Si,0.14Mn,0.013P,0.003S,0.37Cu,0.019Als,0.0087N）由实验室15 kg真空感应炉熔炼铸成60mm×120mm板坯经5道次热轧成3.95 mm板,终轧温度870℃。研究了（轧后870℃水冷）直接水淬和（870℃水冷至580℃空冷）阶梯冷却工艺对热轧板表层和心部抑制剂析出的影响。结果表明,热轧板中析出的主要抑制剂为Cu₂S球形颗粒,和析出一些MnS等;在热轧板表层析出的抑制剂比中心层少,但平均尺寸比中心层大;阶梯冷却钢中的析出抑制剂尺寸大于直接水淬钢中的析出抑制剂尺寸。

Effect of Hot Rolling and Cooling Process on Inhibitor in Cu-Bearing Hi-B Steel

The simulated CSP process tested Cu-bearing high magnetic induction oriented (Hi-B) steel (/% : 0. 06C, 3. 38Si, 0. 14Mn, 0. 013P, 0. 003S, 0. 37Cu, 0. 019Als, 0.0087N) is melted by laboratory 15 kg vacuum induction furnace, cast to 60mm x 120mm slab and hot-rolled by 5 passes to 3. 95 mm plate with finishing rolling temperature 870 °C. The effect of direct water-quenching (after rolling water-quenching at 870℃ ) and stepped cooling ( after rolling water-quenching at 870℃ to 580℃ then air-cooling) process on precipitation of inhibitors at surface layer and center of hot-rolled plate has been studied. Results show that the main inhibitors precipitated in hot-rolled plate are Cu₂S spherical particles with some MnS etc ； the amount of inhibitors precipitated at surface layer of hot-rolled plate is less than that precipitated at center of plate, but the average size of inhibitors is larger than that at center； and the size of precipitated inhibitors in steel plate by stepped cooling process is larger than the size of precipitated inhibitors in steel plate by direct water quenching process.