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系统研究了高强机械用钢频发的条带状红铁皮缺陷,采用场发射SEM及EPMA研究了铁皮的表面及截面情况,通过热轧生产线生产情况分析了条带状铁皮的间距特性。结果表明,条带状红铁皮处铁皮明显增厚,铁皮与基体界面存在硅的富集区;而铁皮的条带状间距距离与精除鳞喷嘴间距存在明显的对应性,因此,该缺陷与精除鳞水喷射搭界面的除鳞效果不佳密切相关。应用差热分析仪对钢种的氧化特性分析发现,精除鳞前温度区间为铁皮增厚波峰区域,加上Fe2SiO4相的形成增加了铁皮的黏附力,因而极易造成精除鳞的困难。在机制研究的基础上,制定了热轧生产控制要求及钢种硅控制方案,成功消除了条带状红铁皮的产生。
The defects of strip-shaped red-iron skin frequently occurred in high-strength mechanical steel were systematically studied. The surface and cross-section of the metal skin were investigated by field emission SEM and EPMA. The pitch characteristics of strip-shaped metal skin were analyzed by the production of hot rolling line. The results show that the scale is thicker and the enrichment zone of silicon is present at the interface between the scale and the substrate. However, there is a clear correspondence between the stripe distance of the scale and the spacing of the fine descaling nozzles. Therefore, Fine descaling water spraying interface with the descaler effect is closely related. The application of differential thermal analyzer for the analysis of the oxidation characteristics of the steel found that the pre-descaling temperature range for the thickened metal sheet peak area, coupled with the formation of Fe2SiO4 phase increases the adhesion of the metal, which can easily lead to the difficulty of descaling. On the basis of the mechanism study, the hot rolled production control requirements and the steel silicon control scheme have been worked out and the production of banded red iron skin has been successfully eliminated.