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喷射冶金在合金化方面的应用近几年来日益受到重视,应用范围也随之扩大[1—3]。为了提高20CrMnTi钢钛的收得率,我们在生产规模上采用钢包喷吹钛铁粉的方法,试验了60炉,钛的平均收得率为69.2％,较传统的加钛工艺提高约一倍。钢中加钛的传统工艺是将钛铁块加入炉内,这种工艺,由于钛与氧的亲和力强(介于铝和硅之间);且因钛的比重小(4.5)和熔点较高(1725℃),加入的钛铁会较长时间地飘浮在渣中,所以钛的烧损很大。我厂采用钢包喷粉的方法将钛铁粉直接喷入钢液中,由于粉料的颗粒小及钢液搅动好,加入的钛会很快熔入钢中,避免了与炉渣和炉气中的氧长时间接触,从而明显地降低了烧损。由于减少并改变了夹杂物的形态,所以机械性能好,a_k值提高1.5—2倍。
Spray metallurgy applications in alloying more and more attention in recent years, the scope of application also will be expanded [1-3]. In order to improve the yield of 20CrMnTi steel titanium, we used the method of ladle blasting titanium iron powder in the scale of production, and tested 60 furnaces, the average yield of titanium was 69.2%, which was about double that of the traditional titanium adding process . Titanium steel is added to the traditional process of titanium is added to the furnace, this process, due to the strong affinity of titanium and oxygen (between aluminum and silicon); and due to the small proportion of titanium (4.5) and higher melting point (1725 ℃), the joining of ilmenite will float in the slag for a long time, so the burning of titanium is very big. I plant the method of ladle dusting titanium iron powder directly into the molten steel, due to the small size of the powder and molten steel stir well, the added titanium will quickly melt into the steel to avoid and slag and furnace gas Of the oxygen contact for a long time, thus significantly reducing the burning. Due to reduced and changed the morphology of inclusions, so good mechanical properties, a_k value increased by 1.5-2 times.