GCr15冶炼过程中钢水洁净度的研究

Study on Cleanliness of Bearing Steel GCr15 During Steelmaking Process

研究了在EAF-EBT-LF-VD-CC冶炼工艺下影响轴承钢GCr15洁净度的N、Ti、Ca、S、O等元素的变化规律,以及对GCr15质量的影响。结果表明:EBT出钢和LF精炼期的增N量可以通过VD真空脱气和钢包软吹氩去除,而Ti的来源主要在于合金和耐火材料的带入;EBT出钢过程中加入活性石灰和Ca处理都易导致钢中Ca含量的增加;高碱度精炼渣有利于钢水脱硫,但不利于改善钢中夹杂物的性质和形态;GCr15钢中夹杂物主要是呈菱形的氮化钛和硅铝镁氧化物夹杂。

The change of N,Ti,Ca,S content in steel GCr15 during EAF-EBT-LF-VD-CC process and effect on the product quality were studied. The results showed that the nitrogcn pick-up during EBT tapping and LF refining could be eliminated by vacuum treatment and soft Ar blowing in VD process and Ti comes from alloys and refractory; EBT tapping with active lime addition and Ca-wire feeding could result in the increment of Ca content; high basicity refining slag is benefit to desulfurization, but without modification of inclusions; the major inclusions of GCr15 are rhombic TiN and oxides of Si,Al,Mg.