Effect of SiO2 containing slag for electroslag remelting on inclusion modification of 42CrMo steel

摘要: Five heats were carried out to study the effects of SiO2 containing slag for electroslag remelting (ESR) on inclusion characteristics 42CrMo steel. Fluoride vaporization at elevated temperature from slags was also explored by thermogravimetric analysis. The results show that fluoride is dominated viscosity and component activities in melt. Slag composition has an important effect oxide inclusion. For 70 wt% CaF2 –30 wt% Al2 O3 slag, compositions inclusions remelted steel no obvious differences compared with virgin steel. Whereas, content processed bearing increasing trend increase 50 wt% CaF2 –CaO–SiO2 MgO · Al2 are modified (Al,Ca,Mg,Si)O low melting temperature. Al2 contents closely related concentration molten which addition . In testing various slags, incorporation T2 –30 wt% CaO–20 wt% SiO2 shows highest cleanliness This implies can be a promising ESR process alloy requiring Al refinement due less better modification.