Specialized metallurgical processes – compositions for use therei – Processes – Producing or treating free metal
Reexamination Certificate
2005-11-11
2010-10-26
Wyszomierski, George (Department: 1793)
Specialized metallurgical processes, compositions for use therei
Processes
Producing or treating free metal
C075S382000, C075S384000, C075S387000, C075S552000, C075S558000, C075S560000
Reexamination Certificate
active
07819940
ABSTRACT:
For the production of stainless steel of the ferritic AISI 4xx group of steels, particularly the AISI 430 group of steels, based on liquid pig iron and FeCr solids, the invention proposes the use of the AOD (Argon Oxygen Decarburization) process in which oxygen and inert gas (inactive gas) together are blown into the bath through nozzles and top-blown onto the surface of the bath by a blowing lance. The aim of the treatment is to conclude a smelting charge within an optimal time period, to achieve the intended tapping temperature and composition, and to minimize chromium losses. This is achieved by a correspondingly applied technology and by means of a metallurgic process model which observes, prognosticates and controls the treatment of the smelting charge.
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Metal Suppliers Online. “430 Stainless Steel Material Property Data Sheet” copyright 2009, dowloaded Nov. 3, 2009.
Written translation of JP 63-223113 published Sep. 16, 1988 by Masataka Matsuo et al.
Patent Abstract of Japan No. 57060012, Apr. 1982.
Lemke et al., “Tailored Solution for Production of Quality Steel,” Steelmaking XP 009010639, v. 24, No. 4, Aug. 2001.
Abelman ,Frayne & Schwab
McGuthry-Banks Tima M
SMS Siemag Aktiengesellschaft
Wyszomierski George
LandOfFree
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