文章摘要
50Cr5MoV钢中非金属夹杂物行为
Behavior of non-metallic inclusion in 50Cr5MoV
  
DOI:
中文关键词: 50Cr5MoV钢  夹杂物行为  全氧含量
英文关键词: 50Cr5MoV steel  inclusion behavior  total oxygen content
基金项目:国家自然科学基金资助项目(501440050)
作者单位
吕沙,吴光亮 中南大学 资源加工与生物工程学院湖南 长沙 410083 
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中文摘要:
      对采用“EBT→LF→VD”工艺路线生产50Cr5MoV锻钢轧辊炼钢过程全氧和夹杂物进行了分析.结果表明:LF精炼后钢液中ω(T[O])平均为47×10-6,VD出站为14×10-6,中间包为15.5×10-6,铸坯为18×10-6.LF精炼初期,钢中夹杂物主要是不规则的Al2O3夹杂,96.75%的夹杂物尺寸小于10 μm.LF精炼后,大量夹杂物为CaO-Al2O3-SiO为主要成分的0~10 μm复合氧化物夹杂.钢水向中间包转移过程中保护性浇注不理想,二次氧化严重导致钢水夹杂逐渐增多,主要为球形mCaO·nAl2O3的复合夹杂物.铸坯中99.81%的夹杂物尺寸小于10 μm,其中大部分为球形钙铝酸盐夹杂,还有少量球状硅铝酸钙复合夹杂.全过程的工艺优化是控制夹杂物(主要是氧化物) 的合理途径, 可确保实现50Cr5MoV合金铸钢的冶炼.
英文摘要:
      The total amount of oxygen content and inclusions in 50Cr5MoV forged steel roll by the route of EBT→LF→VD were analyzed . The results show the average ω(T[O]) is 47×10-6 after LF refining and 14×10-6after VD refining ,and 15.5×10-6 in tundish and 18×10-6 in billet on average. During the initial stage of LF refining, the inclusions in steel mainly are irregular forms of Al2O3, 96.75% of the inclusions have diameters less than 10 μm. After the LF refining, most of the inclusions are 0~10 μm diameters of compound oxide inclusions, predominantly containing CaO Al2O3 SiO2.During the transfer of steel to tundish,the protective casting is not ideal, and the severe reoxidation contributes to the growing amount of inclusions, mainly containing spherical mCaO·nAl2O3compound oxide inclusions.99.81 percent of the inclusions in the steel slab are less than 10 μm.Most of them are spherical calcium-aluminate compound inclusion, with a few spherical calcium aluminosilicate compound inclusion. Therefore, inclusion control in 50Cr5MoV steel is a systematic engineering and could not be achieved by partial technical improvement.
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