热轧钢板典型压入式氧化铁皮的分类及其形成机理

热轧钢板表面形成的典型压入式氧化铁皮可分为浅层压入式和嵌入式两种,分别对两种类型的压入式缺陷进行了分析和研究.结果表明,在钢坯再加热过程中,粘附在钢坯表面的保护渣与炉生氧化铁皮粘合在一起;粗除鳞后,残留的相互粘合的保护渣与炉生氧化铁皮在粗轧过程中被压入到钢板较深的位置,形成嵌入式的氧化铁皮;若连铸坯表面粘附保护渣颗粒,经粗除鳞未除完全后,残留的保护渣与新生的一次氧化铁皮包覆到一起,在粗轧过程中被压入到钢板较浅的位置,形成浅层压入式的氧化铁皮.

Classification and Their Formation Mechanism of Typical Rolled-in Scales on Hot Rolled Plates

Typically the scales on the plates during hot rolling can further divided into two kinds, i.e., being rolled into superficial layer and being embedded in plate, and the defects resulting from both kinds of scales were investigated. The results showed that the casting powder adhering to the slab surface is combined with the scales formed in reheating furnace. After the rough descaling, the residual combinations were wholly rolled into the plate and passing through the surface during rough rolling, thus forming the embedded scales. If the casting powder is adhering to a continuous casting billet, the residual casting powder after rough descaling is combined with the primary scales in reheating furnace, then the combinations are rolled into the superficial layer of plate during rough rolling, thus forming the scales in superficial layer.