Recent Development to Control Nitrogen Content of High-Alloy Steel by Optimization Treatment Conditions at the Secondary Refining Process
(Room 410)
07 May 19
11:00 AM
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11:30 AM
Tracks:
Ladle & Secondary Refining
A progressive and efficient refining process was performed to control the nitrogen content of special-grade high-alloy steel at West Japan Works Kurashiki, JFE Steel Corp. In order to prevent nitrogen absorption in the ladle furnace, the argon gas flowrate via porous plug was optimized. Furthermore, by changing the timing of ferro-sulfur alloy additions during RH degassing, the denitrogenation rate increased dramatically, by 1.9 times. With this advanced and unique process, the nitrogen content of high-alloy steel containing 0.016 mass % sulfur decreased to less than 40 ppm. In addition, energy consumption of the total refining process decreased by 5% compared to the conventional process.