Q195铸坯大型夹杂物行为分析  

Behavior Analysis of Large Inclusion in Q195 Slab

作　　者：丁辉[1] 秦书洋 王雁 马军红 

机构地区：[1]石家庄钢铁有限责任公司技术中心,河北石家庄050031 [2]华北理工大学河北省高品质钢连铸工程技术研究中心,河北唐山063009

出　　处：《铸造技术》2017年第6期1430-1432,共3页Foundry Technology

摘　　要：通过示踪等实验对北方某钢厂Q195钢的大型夹杂物含量、种类、粒径、来源以及铸坯中的氧含量等进行了研究,结果表明:铸坯中T[O]平均含量为128×10^(-4)%,含量偏高,混浇坯T[O]为204×10^(-4)%,较正常坯增加了59.4%,混浇坯中[N]为60×10^(-4)%,较正常坯增加了57.9%,换包过程存在严重的二次氧化现象;铸坯中大型夹杂物含量为32.4 mg/10 kg,头坯、尾坯大型夹杂含量分别为42.7 mg/10 kg、43.6 mg/10 kg,混浇坯为62.5 mg/10 kg;铸坯中大型夹杂物粒度80~140μm约占48.0%,140~300μm约占43.3%,>300μm约占5.4%;铸坯中大型夹杂物主要为SiO_2-Al_2O_3-CaO-MnO复合脱氧夹杂,约占大型夹杂物总量的90%,其中约55%沾附了钢包渣、中间包渣示踪剂;含C的SiO_2夹杂约占5%,分析为引流剂;钢包渣、中间包渣、结晶器保护渣及耐火材料的复合脱落物约占5%。Oxygen and nitrogen content, type, size, source of large inclusions in Q195 continuous casting slab from a steel corp were shudied by tracer test etc. The results show that the T [O] content is 128×104% in the slab, which is the higher. T[O] content in the mixed casting billet is 204× 10-4%, increased by 59.4% than normal billet, and IN] content is 60× 104%, increased by 57.9% than normal billet. These data show that serious secondary oxidation phenomenon exists in the ladle process. In the slab, the large inclusion content is 32.4 mg/10 kg, and 42.7 mg/10 kg in head billet, 43.6 mg/10 kg in tail billet, 62.5 mg/10 kg in mixed billet. Large inclusions with the size of 80 -140 μm accounts for about 48.0%, 140 - 300 μm accounts for about 43.3% ,more than 300μm accounts for about 5.4%. The large inclusions is mainly SiO2-Al2O3-CaO- MnO, accounts for about 90%, with about 55% from the ladle and tundish slag. SiO2 inclusions containing C accounts for about 5%,which is from drainage agent. Drainage agent slag ladle, tundish slag, mould protection slag and refractory compound account for about 5%.

关 键 词：大型夹杂物 大样电解 示踪试验 

分 类 号：TF77[冶金工程—钢铁冶金]