摘要
0.88%Si无取向硅钢的生产工艺为100 t BOF出钢时加300kg石灰,终点[C]0.035%~0.05%,出钢温度1 640~1 650℃,RH吹氧脱碳,加99.0%Al-Fe合金6.69 kg/t,加70%Si-Fe合金15.70 kg/t,70 mm板坯连铸过程全程保护浇铸,使用镁质碱性中间包覆盖剂。分析结果表明,RH终点[O]28×10^(-6),铸坯[O]22×10^(-6),RH-前[N]为16×10^(-6),RH过程增氮4×10^(-6),RH结束到铸坯增氮6×10^(-6);RH脱碳终点时钢中夹杂物以球形MnO·Al_2O_3为主;RH出站时以不规则形状的Al_2O_3为主,并伴有少量单独存在的CaS夹杂;中间包钢液内的夹杂物主要以不规则形状的Al_2O_3为主;铸坯中多为不规则形状的Al_2O_3以及少量A1N,还有少量由结晶器卷渣引起的含Na成分的复合夹杂物。
The production process of 0.88%Si non-oriented silicon steel is adding 300 kg lime in tapping of 100 t BOF,controlling end[C]0.035%-0.05%and tapping liquid temperature 1 640 - 1 650 ℃,RH blowing oxygen to decarburize,adding 99.0%Al-Fe alloy 6.69 kg/t and adding 70%Si-Fe alloy 15.70 kg/t in RH refining process,in whole process shield-atmosphere casting 70 mm slab,and using magnesia basic tundish shielding agent.Analysis results show that RH end[O]is 28×10^-6,slab[O]is 22×10^-6,RH beginning[N]is 16×10^-6,nitrogen content in liquid increases by 4 × 10^-6 during RH process and the nitrogen content in steel increases by 6×10^-6 during end RH to slab casting process;at end RH decarburization the main inclusions in steel are spherical MnO·Al2O3,after RH Refining the main inclusions in steel are irregular Al2O3 accompanied by a small amount CaS inclusions;the main inclusions in liquid of tundish are irregular A1_2O_3;in casting slab the most inclusions are irregular A1_2O_3 with a small amount of AlN and minor composite inclusions containing Na caused by slag enclosure in mold.
出处
《特殊钢》
北大核心
2015年第2期1-4,共4页
Special Steel
