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试验研究了单辊轻压下量(6~20 mm)和压下位置(1~#~6~#辊)对高碳钢SWRH72B(/%:0.71C,0.22Si,0.64Mn,0.010P,0.006S)180 mm×180 mm铸坯中心碳偏析和低倍组织的影响。结果表明,在固相率fs为0.45~0.63时,施加单辊轻压下有利于降低连铸坯的中心碳偏析,当固相率fs大于0.82时,无法消除缩孔和降低中心碳偏析;在压下量6~20mm,随着压下量的增加中心碳偏析度从1.15降低至1.04,在压下量大于15mm后铸坏容易出现裂纹;超弱冷(比水量0.40L/kg)较弱冷(比水量0.65L/kg)更有利于控制中心碳偏析;综合分析得出,SWRH72B钢180mm×180mm铸坯在拉速1.3m/min,结晶器搅拌300 A、5Hz,比水量0.40 L/kg时,5~#辊单辊轻压下的压下量15mm铸坯中心碳偏析和低倍组织最佳。
The effects of single roll reduction (6 ~ 20 mm) and pressing position (1 ~ # ~ 6 ~ # roll) on the SWRH72B /%: 0.71C, 0.22Si, 0.64Mn, 0.006S) Influence of 180 mm × 180 mm center segregation and low magnification on the slab. The results show that when the solid fraction fs is 0.45-0.63, mild rolling with single roller is helpful to reduce the center carbon segregation. When the solid fraction fs is more than 0.82, the shrinkage and center carbon segregation can not be eliminated. In the reduction of 6 ~ 20mm, the center carbon segregation decreases from 1.15 to 1.04 with the decrease of the reduction, and cracks easily occur after the reduction of more than 15mm. Ultra-weak cold (specific water 0.40L / kg) Weak cold (specific water 0.65L / kg) is more conducive to the control center carbon segregation; comprehensive analysis showed that SWRH72B steel 180mm × 180mm slab at a pulling speed of 1.3m / min, mold stirring 300 A, 5Hz, specific water 0.40 L / kg, 5 ~ # roller single roll pressure reduction of 15mm slab central carbon segregation and microstructure of the best.