摘要
夹杂物对高品质特殊钢的服役性能有显著影响,但国内外对冶炼过程35MnB钢中夹杂物的演变行为尚不明晰。通过采用扫描电镜和FactSage热力学计算等方法和手段,对Al粒+SiC扩散脱氧(1号工艺)和SiC扩散脱氧(2号工艺)生产的35MnB钢冶炼过程钢成分、渣成分及钢中夹杂物的演变行为进行研究。结果表明,1号工艺精炼过程会出现钢水增硅,不同扩散脱氧工艺铸坯中的全氧和氮质量分数差别不大,全氧质量分数分别为11.9×10^(-6)和11.6×10^(-6)。35MnB钢中主要存在尺寸小于5μm的氧化物、硫化物或TiN夹杂物。夹杂物种类主要受沉淀脱氧工艺影响,受扩散脱氧工艺影响较小。冶炼过程夹杂物的演变规律为:Al_(2)O_(3)(氩站)→CaO-MgO-Al_(2)O_(3)(LF精炼)→CaO-MgO-Al_(2)O_(3)-CaS(软吹)→CaO-MgO-Al_(2)O_(3)-CaS或CaO-Al_(2)O_(3)-CaS(铸坯),夹杂物演变规律与热力学计算结果相符。
Inclusions have a significant impact on the service performance of high-quality special steels,but the evolution behavior of inclusions in 35MnB steel during the smelting process is still unclear at home and abroad.The evolution behavior of steel composition,slag composition,and inclusions in 35MnB steel produced by Al particle+SiC diffusion deoxidation(process 1)and SiC diffusion deoxidation(process 2)during the smelting process was studied using scanning electron microscopy and FactSage thermodynamic calculations.The results show that during the refining process of No.1 process,there will be silicon addition in molten steel,and there is no significant difference in the total oxygen and nitrogen mass fractions in different diffusion deoxidization processes,with total oxygen mass fractions of 11.9×10^(-6) and 11.6×10^(-6),respectively.In 35MnB steel,there are mainly oxides,sulfides,or TiN inclusions with size smaller than 5μm.The type of inclusions is mainly affected by precipitation deoxidization process,but less affected by diffusion deoxidization process.The evolution of inclusions in smelting process is:Al_(2)O_(3)(argon Station)→CaO-MgO-Al_(2)O_(3)(LF refining)→>CaO-MgO-Al_(2)O_(3)-CaS(soft blowing)-→CaO-MgO-Al_(2)O_(3)-CaS or CaO-Al_(2)O_(3)-CaS(billet).The evolution of inclusions is consistent with the thermodynamic calculation results.
作者
李国胜
战东平
方宇荣
汪灿荣
蔡常青
许英华
LI Guosheng;ZHAN Dongping;FANG Yurong;WANG Canrong;CAI Changqing;XU Yinghua(School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China;Fujian Sansteel(Group)Co.,Ltd.,Sanming 365000,Fujian,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2023年第5期568-577,共10页
Journal of Iron and Steel Research
基金
江西省技术创新引导类计划项目(20202BDH80002)。
关键词
35MnB钢
夹杂物
精炼
钙处理
35MnB steel
inclusion
refining
calcium treatment
refining
