1990 Volume 76 Issue 11 Pages 1863-1870
Kawasaki Steel Chiba Works has developed the new stainless steel making process by two combined converter with smelting reduction of chromium ore.
Saving energy by replacing electric power, enlarging flexibility of material choice, and high productivity were considered to be the basic concept of stainless steel making.
Chromium ore are specially pretreated for pelletizing and prereduced with rotary kiln. Prereduced chromium pellet and coke are fed into combined blowing converter, K-BOP, with top charging method. As for Austenitic stainless steel grade, stainless steel scrap are charged into the K-BOP for smelting reduction prior to the blowing. Scrap can be melted during the first stage blowing. Hence, there is no disturbance for the smelting reduction operation.
The utilization of the new smelting reduction process have succeeded in the improvement of productivity and energy cost for stainless steel without electric arc furnace.