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对采用“EBT→LF→VD”工艺路线生产50Cr5Mo V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10μm.LF精炼后,大量夹杂物为Ca O-Al2O3-Si O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m Ca O·n Al2O3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50Cr5Mo V合金铸钢的冶炼.
The analysis of oxygen and inclusions in 50Cr5Mo V steel forging process with “EBT → LF → VD” process route shows that the average value of ω (T [O]) in the liquid steel after LF refining is 47 × 10-6, the outlet of VD is 14 × 10-6, the tundish is 15.5 × 10-6, the billet is 18 × 10-6.LF refining inclusions are mainly irregular Al2O3 inclusions, 96.75 % Of inclusions size less than 10μm.LF refining, a large number of inclusions CaO-Al2O3-Si O as the main component of 0 ~ 10μm composite oxide inclusions during the transfer of molten steel tundish protective casting is not ideal, secondary The serious oxidation resulted in the increase of inclusions in molten steel, mainly inclusions of spherical m CaO · n Al 2 O. 99.81% of the inclusions in the cast slab were less than 10μm in size, most of which were spherical calcium aluminate inclusions and a little spherical silica Calcium aluminate composite inclusions The process optimization of the entire process is a reasonable way to control inclusions (mainly oxides) and ensures the smelting of 50Cr5Mo V alloy cast steel.