FTSR连铸耐蚀钢保护渣优化及铸坯角横裂控制

Optimization of mould flux in continuously casting corrosion resistant steel by FTSR process and counter measure for slab corner transverse crack

通化钢铁股份公司采用FTSR工艺在试生产的采暖散热器片用耐蚀钢的过程中,易出现角横裂缺陷和粘结事故。为了提高结晶器内初生凝固壳生长的均匀性,在保证优良的润滑性前提下,对保护渣的成分、性能进行了优化,从而实现了结晶器弯月面处坯壳的弱冷。在此基础上,对结晶器和二冷段的冷却工艺进行了优化,提出了防止铸坯角横裂的技术措施,改善了薄板坯的表面质量。

In the process of trial production of the corrosion resistant steel used for heating radiator by FISR technology in Tonghua Iron＆ Steel Co. , corner transverse crack and sticking accidents are apt to occur. In order to improve the uniformity of the solidification shell newly formed in the mould the chemical compositions and properties of the mould flux are optimized under the prerequisite that the good lubricating ability be ensured and thereby soft cooling of the shell at the meniscus of the mould is realized. Thereupon the cooling process for the mould and the second cooling segment is opti- mized and technical measures for prevention of corner transverse crack are put forward. As the results the surface quality of the thin slab is improved.