Title: Method for refining a molten steel in vacuum

Abstract: A method for refining a molten steel in vacuum, which comprises blowing a non-oxidizing gas or a non-oxidizing gas together with an oxidizing gas into a bath of the molten steel in a refining vessel of a R-H vacuum degassing apparatus at a position between the bath surface and a bath depth of 50 cm (inclusive) from the bath surface in an almost horizontal direction.

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Inventors: Yamamoto, Satomi (Kitakyushu, JA)
Yoshii, Masataka (Kitakyushu, JA)

Application Number: 744808
Filing Date: 1976-11-24
Publication_date: 1978-01-31
Assignee: Nippon Steel Corporation (Tokyo, JA)
Primary Class(es): 75/511 75/512
Other Classes:
US Patent Ref:

3574596	Apr, 1971	Lohman	75/49.
3689046	Sep, 1972	De Bie	75/49.
3798025	Mar, 1974	Ramachandran	75/49.
3854932	Dec, 1974	Bishop	75/49.
3980469	Sep, 1976	Forster	75/49.

Other Refs:
Primary Examiner: Rosenberg, Peter D.
Assistant Examiner:
Attorney: Toren, McGeady and Stanger