C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
148/34.6
C21D 8/10 (2006.01)
Patent
CA 1192476
Abstract As-pierced steel casing is made by heating a killed steel consisting of 0.20-0.35 carbon, 1.0-2.0 manganese, up to about 0.60 silicon, up to about 0.04 each of phosphorous and sulfur, 0.05-0.25 vanadium, from 0.005-0.025 nitrogen and/or from 0.0100.10 columbium, and the balance iron, to a temperature of at least about 2200°F to dissolve vanadium carbides, piercing the steel, and allowing said steel to cool to effect precipitation of vanadium carbides with resulting refinement of austenite to a grain size of about ASTM 5 or finer and of ferrite to a grain size of about ASTM 7 or finer. The resulting pierced steel has a yield strength of 80-110 ksi, a minimum ultimate tensil strength of 100 ksi, a minimum elongation of 12-1/2% in two inches, and a ferrite-pearlite microstructure having a ferrite grain size of about ASTM 7 or finer.
400034
Davenport Anthony T.
Waid George M.
Republic Steel Corporation
Ridout & Maybee Llp
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