Method of denitriding a high chromium molten steel with a minimu

Details Method of denitriding a high chromium molten steel with a minimu Method of denitriding a high chromium molten steel with a minimu

1978-01-27

1979-05-15

Rosenberg, P. D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 59, 75 60, 751305, C21C 710, C22C 3300

Patent

active

041546024

ABSTRACT:
A method of denitriding a high chromium molten steel with a minimum chromium loss is disclosed. A high chromium molten steel containing 0.8-2.5% of C and 10-35% of Cr is denitrided to a final nitrogen content of not more than 40 ppm in a ladle under vacuum by flowing an inert gas into molten steel at a flow rate of not less than 15 Nl/min per ton of molten steel and at the same time blowing oxygen gas against molten steel until carbon content [C] in molten steel satisfies the following equations (1) and (2) in accordance with the carbon content prior to decarburization [C] of molten steel:

REFERENCES:
patent: 3205067 (1965-09-01), King
patent: 3773496 (1973-11-01), Knuppel
patent: 3788836 (1974-01-01), Muscatell
patent: 3976473 (1976-08-01), Katayama

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