高温电热合金铁铬铝冶金工艺研究

针对铁铬铝电热合金的钢种特点,开发了精炼过程硅含量控制、VOD真空精炼铝合金化、连铸工艺及保护渣等关键技术.通过实践表明:可将铁铬铝合金中硅质量分数控制在0.15％ 以下,VOD真空条件下完成铝质量分数5％ ～6％ 的合金化,VOD精炼时间控制在60～70 min,铝收得率提高至94.5％.通过钢包稀土合金化,稀土合金...

Study on metallurgical technology of high temperature electro-thermal alloy of FeCrAl

According to the steel characteristics of FeCrAl electro-thermal alloy,the key technologies,such as silicon content control in refining process,VOD vacuum refining of multiple alloying,continuous casting process and mould flux were introduced.The practice shows that the silicon mass fraction of FeCrAl alloy can be controlled below0.15%,the alloying of 5%-6%aluminum can be completed under VOD vacuum condition,the VOD refining time is controlled within 60-70 min,the yield of aluminum can be increased to 94.5%.The yield of rare earth can reach 50%through ladle rare earth alloying.The lower basicity mould flux based on CaO-SiO₂ of FeCrAl alloy has been developed.The continuous casting process suitable for this steel is formulated.The mould adopts strong cooling and the secondary cooling zone adopts weak cooling.After the slab is discharged,it is kept warm and sent in time for heating and rolling.Through a series of measures,the steady batch production of FeCrAl alloy has been realized.