Experimental study on smelting duplex stainless steel in top bottom combined blowing converter
A duplex stainless steel smelting experiment was conducted by blowing molten iron in a 500 kg multifunctional top bottom combined blowing converter.By adopting methods such as dephosphorization of molten steel,carbon reduction and chromium retention,deep desulfurization of molten steel,and nitrogen increasing of molten steel,it is obtained that when the carbon mass fraction is reduced to 2.0％,the temperature of molten steel is controlled at 1 360-1 440 ℃,the basicity of slag is controlled at 1.4-1.8,w(FeO)in slag is controlled at 15％-20％,and the phosphorus mass fraction in molten steel can be removed by more than 75％.During the carbon reduction and chromium retention process of molten steel,the temperature of the steel is always controlled above 1 660 ℃.At the same time,as the carbon content decreases,the proportion of oxygen gradually decreases,the proportion of argon increases,the oxidation of chromium elements reduces.After alloying,the slag continues to be reduced,with the basicity around 2.0 and steel temperature between 1 550 and 1 600 ℃ and the sum of FeO and MnO mass fraction in the slag is controlled below 1％,and the sulfur mass fraction in the steel can be reduced from 0.004 0％to 0.001 0％.The proportion of austenite and ferrite in the smelting of duplex stainless steel in the top bottom combined blowing converter ranges from 49％to 51％,and the impact performance of the steel plate is much higher than the standard value of 180 J,which meets the requirements of users.
top bottom combined blowing converterduplex stainlesscarbon reduction and chromium retentiondephosphorization
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万方数据
维普
