Method for producing alloy steels having a high chromium content

Details Method for producing alloy steels having a high chromium content Method for producing alloy steels having a high chromium content

1977-12-08

1979-09-18

Rosenberg, P. D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

751305, C21C 532, C21C 534, C22C 3304

Patent

active

041681584

ABSTRACT:
An alloy steel having a high chromium content and an extremely low carbon content is produced by soft blowing oxygen gas under vacuum into a molten steel in a ladle containing a high chromium content and a high carbon content while blowing an inert gas of a flowing rate of 1-15 Nl/min per ton of the molten steel into the molten steel until the carbon content in the molten steel becomes 0.025-0.050% by weight. And subsequently only the blowing of the inert gas is conducted into the molten steel under a high vacuum degree of less than 10 torr so that the reaction active area ratio becomes more than 7% to reduce the carbon content in the steel to less than 0.003%.

REFERENCES:
patent: 3695946 (1972-10-01), Demeaux
patent: 3751242 (1973-08-01), Knuppel
patent: 3850617 (1974-11-01), Umowski
patent: 3854932 (1974-12-01), Bishop

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