薄板坯合金钢窄面凹陷的控制实践

Practice of Controlling Pit Defects Formed on Surface of Narrow Sides of Thin Alloyed Steel Slabs

鞍钢股份有限公司炼钢总厂四分厂3#板坯连铸机生产过程中,合金钢铸坯窄面经常出现纵向凹陷,影响连铸坯的表面质量,并造成轧材缺陷。分析了连铸板坯窄面纵向凹陷的形成原因,结合生产试验,通过采取优化结晶器足辊冷却水流量、结晶器锥度、结晶器窄边足辊布置及铸机拉速等措施,提高了连铸板坯的表面质量,有效地控制了铸坯窄面的纵向凹陷。

Longitudinal pit defects often occur on the surface of narrow sides of alloye d steel strands cast by No.3 slab continuous caster in No.4 Branch of General Steelmaking Plant of Angang Steel Co., Ltd., which influences the surface quality of continuous casting slabs and then brings about the defects of rolled steel products. The causes leading to the longitudinal pit defects on the surface of narrow sides of continuous casting slabs were analyzed. Based on the pilot pro-duction, the surface quality of continuous casting slabs were improved and the longitudinal pit defects were controlled effectively by optimizing the flow of cooling water for the mould foot-roller, the mold taper, the installation of the foot roller at the narrow side of the mold and the casting speed.