CSP扇形段分节辊处“黑石头”组织结构及形成机理研究

Research on Microstructures and Forming Mechanism of "Black Stone" on Fan-shaped Segment Roll of CSP

本文采用化学分析、SEM、XRD等方法,对酒钢CSP薄板坯扇形段分节辊处的"黑石头"的组织结构进行分析,研究了"黑石头"形成机理,结果表明:由于CSP格栅表面粗糙不平,造成了大量保护渣和极少量耐火材料的堆积,这些氧化物与铸坯表面的氧化铁烧结,在氧化铁(方铁矿)表面形成熔点较高的Ca14Mg2(SiO4)8、Ca2MgSi2O7、Ca6Si6O17(OH)2、CaFeSiO4、CaMgSiO4等复合矿物,这些高熔点复合矿物在氧化铁(方铁矿)表面逐渐堆积,形成"黑石头"引起铸坯凹陷。

The microstructures and the forming mechanism of ＂black stone＂ on fan-shaped segment roll of CSP are investigated by means of chemical,SEM and XRD analysis.The research results showed that a great deal mould powder and a few refractories accumulated on uneven surface of grid.This oxide and ferric oxide sintered and formed the high melting point compound such as Ca14Mg2（SiO4）8,Ca2MgSi2O7,Ca6Si6O17（OH）2,CaFeSiO4,CaMgSiO4.The high melting point compound accumulated and formed ＂black stone＂.It aroused surface indentation of CSP slab.