Removal method of nitrogen in molten steel

Details Removal method of nitrogen in molten steel Removal method of nitrogen in molten steel

2011-03-08

2011-03-08

Wyszomierski, George (Department: 1733)

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

C075S512000, C075S548000, C075S568000, C075S570000

Reexamination Certificate

active

07901482

ABSTRACT:
Molten steel is refined in an electric furnace by using iron scrap as a main iron source, and is tapped into a separate refining vessel. Thereafter, metallic-Al containing material and CaO are added onto a bath surface of the molten steel, and an oxygen containing gas is supplied to the molten steel. Thereby, a nitrogen-removal reaction utilizing an AlN formation reaction is caused to proceed. Consequently, even in the case of molten steel having a low carbon content, a low-nitrogen steel can be refined and produced at low costs.

REFERENCES:
patent: 4154602 (1979-05-01), Kaito et al.
patent: 4222768 (1980-09-01), Suyama
patent: 5207844 (1993-05-01), Watanabe et al.
patent: 5304231 (1994-04-01), Kato et al.
patent: 5391241 (1995-02-01), Watanabe et al.
patent: 6174347 (2001-01-01), Barker
patent: 196 50 498 (1998-04-01), None
patent: 02-179812 (1990-07-01), None
patent: 03-153814 (1991-07-01), None
patent: 03-158410 (1991-07-01), None
patent: 04-218644 (1992-08-01), None
patent: 05-287358 (1993-11-01), None
patent: 05-320733 (1993-12-01), None
patent: 05320733 (1993-12-01), None
patent: 07-113113 (1995-05-01), None
patent: 07-224317 (1995-08-01), None
patent: 8-225819 (1996-09-01), None
patent: 08-246024 (1996-09-01), None
patent: 09-025509 (1997-01-01), None
patent: 09-165615 (1997-06-01), None
patent: 09165615 (1997-06-01), None
patent: 09-235650 (1997-09-01), None
patent: 2000-192192 (2000-07-01), None
patent: 2002-294325 (2002-10-01), None
patent: 2003-089816 (2003-03-01), None
patent: 2004-346367 (2004-12-01), None
patent: 2005-023333 (2005-01-01), None
patent: 2005-232536 (2005-09-01), None
“Stainless Steel Grade 321” from AZo Materials. http://www.azom.com/details.asp?articleID=967, downloaded Apr. 14, 2010. Date added Oct. 23, 2001.
Machine translation of JP 05-320733A published Dec. 1993.
Machine translation of JP 09-165615 published Jun. 1997.
Supplementary European Search Report (in English) dated Jul. 21, 2010 in EP 07 71 4049.
Korean Office Action dated Aug. 18, 2010 which issued in the counterpart Korean patent application.

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