David A Mcgaughey, Age 63611 B St, Munday, TX 76371

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611 B St, Munday, TX 76371 (940) 422-4935

Indianapolis, IN

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Us Patents

Low Cost Making Of A Low Carbon, Low Sulfur, And Low Nitrogen Steel Using Conventional Steelmaking Equipment

US Patent:
8313553, Nov 20, 2012
Filed:
Mar 30, 2009
Appl. No.:
12/414047
Inventors:
Jacobus Marthinus Andreas Geldenhuis - Brownsburg IN,
David John Sosinsky - Carmel IN,
Daniel Gene Murray - Veedersbury IN,
David Wayne McGaughey - Waveland IN,
Eugene B. Pretorius - Mt. Pleasant SC,
Assignee:
Nucor Corporation - Charlotte NC
International Classification:
C21C 7/10
C21C 7/064
C21C 7/068
US Classification:
75508, 75548, 75560, 148540, 164480
Abstract:
A method of making a steel with low carbon less than 0. 035% by weight including steps of preparing a heat of molten steel composition in a steelmaking furnace to a tapping temperature as desired for desulfurization at a VTD, tapping open into a ladle the molten steel composition with an oxygen level between about 600 and 1120 ppm, providing slag forming compound to the ladle to form a slag cover over the molten steel composition in the ladle, transporting the molten steel composition in the ladle to a VTD, decarburizing the molten steel composition at the VTD by drawing a vacuum of less than 650 millibars, after decarburizing, adding one or more deoxidizers to the molten steel composition and deoxidizing the molten steel composition, after deoxidizing, adding one or more flux compounds to desulfurize the molten steel composition, and casting the molten steel composition to form a steel with low carbon less than 0. 035% by weight.

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