Alloys or metallic compositions – Ferrous – Lead – bismuth – selenium – tellurium or calcium containing
Patent
1989-06-07
1990-07-31
Rosenberg, Peter D.
Alloys or metallic compositions
Ferrous
Lead, bismuth, selenium, tellurium or calcium containing
75508, 75526, C21C 702
Patent
active
049447980
ABSTRACT:
The disclosed method is a method of manufacturing clean steel comprising refining molten steel by adding additives of from not more than 0.5% to more than 0.001% by weight of molten steel to the molten steel bath, in vacuo or a non-oxidizing atmosphere within a melting furnace or vessel made of or lined with a basic refractory material consisting essentially of 7-90 wt % of CaO and 90-7 wt % of MgO, which total content being 70% to 99.9%, and optionally included a basic refractory material consisting of 30-0.1 wt % of at least one element selected from the group consisting of Al.sub.2 O.sub.3, CrO, ZrO.sub.2.SiO.sub.2, ZrO.sub.2, ZrC and C as selected components, and obtaining clean steel containing less than 30 ppm of oxygen, less than 30 ppm of sulfur, less than 150 ppm of nitrogen, 5 to 0.1 ppm of Mg and 25 to 0.1 ppm of Ca. Said additives comprises Al and at least one optional element selected from Ti, Nb, Ta, B and alkali earth metal. 5% of a solvent can be included to said additives.
REFERENCES:
patent: 3107995 (1963-10-01), Katakura
patent: 3467167 (1969-09-01), Mahin
patent: 3933480 (1976-01-01), Tipnis
Metal Research Corporation
Rosenberg Peter D.
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