CAJ | 학술논문

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 Al2 O3夹杂，96．75％的夹杂物尺寸小于10μm．LF 精炼后，大量夹杂物为 CaO －Al2 O3－SiO 为主要成分的0～10μm 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·nAl2 O3的复合夹杂物．铸坯中99．81％的夹杂物尺寸小于10μm，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．
대채용“EBT→LF→VD”공예로선생산50Cr5MoV 단강알곤련강과정전양화협잡물진행료분석．결과표명：LF정련후강액중ω（T[O]）평균위47×10－6，VD 출참위14×10－6，중간포위15．5×10－6，주배위18×10－6．LF 정련초기，강중협잡물주요시불규칙적 Al2 O3협잡，96．75％적협잡물척촌소우10μm．LF 정련후，대량협잡물위 CaO －Al2 O3－SiO 위주요성분적0～10μm 복합양화물협잡．강수향중간포전이과정중보호성요주불이상，이차양화엄중도치강수협잡축점증다，주요위구형 mCaO·nAl2 O3적복합협잡물．주배중99．81％적협잡물척촌소우10μm，기중대부분위구형개려산염협잡，환유소량구상규려산개복합협잡．전과정적공예우화시공제협잡물（주요시양화물）적합리도경，가학보실현50Cr5MoV 합금주강적야련．
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 -6 after 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 Al2 O3 ,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-Al2 O3-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·nAl2 O3 compound 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.