一、连铸带坯特点 双辊法连铸,凝固时间非常短,冷却速度为10~2～10~3℃/秒,从轧制速度可计算出凝固时间0.2～0.5秒,在极短的时间内凝固成薄带。其凝固组织基本上类似于连铸钢带的显微组织,表面有急冷细化组织存在,5～6μ极细晶粒组织,里面绝大部分柱状树枝晶,而且枝晶非常细小,2次枝臂间距仅为2～5μ,中间极少等轴晶,其显微组织是在奥氏体基体上分布有铁素体组织,在轧制面的垂直方向,呈现一次树枝状晶,对于 First, the characteristics of continuous casting billet twin-roll casting, solidification time is very short, the cooling rate of 10 ~ 2 ~ 10 ~ 3 ℃ / sec, from the rolling speed can be calculated from the solidification time of 0.2 to 0.5 seconds, Solidified into thin strips in time. The solidified structure is basically similar to the microstructure of the continuous casting strip. The surface is quenched and refined, and 5 ~ 6μ fine grain structure, most of the columnar dendrite inside, and the dendrite is very small, the secondary branch Arm spacing of only 2 ~ 5μ, rarely equiaxed in the middle of the crystal, the microstructure is distributed in the austenite matrix with ferrite in the rolling direction of the vertical plane, showing a dendrite, for