Columbium treated, non-aging, vacuum degassed low carbon steel a

Details Columbium treated, non-aging, vacuum degassed low carbon steel a Columbium treated, non-aging, vacuum degassed low carbon steel a

1973-08-06

1978-11-07

Rutledge, L. Dewayne

Metal treatment

Compositions

Heat treating

148 123, 148142, C21D 714

Patent

active

041244125

ABSTRACT:
A process of producing non-aging, low carbon steel having substantially no yield point elongation in the annealed condition and freedom from critical grain growth. A molten steel having an analysis typical of steel intended for rimmed or killed drawing steel is vacuum degassed to decarburize to a maximum carbon content of about 0.015%, and columbium (niobium) is added in an amount at least sufficient to combine with the carbon present in the steel. The cast material is hot rolled, finishing at 1500.degree. - 1700.degree. F (about 1090.degree. - 1200.degree. K) and coiled at a temperature of about 1500.degree. F (about 1090.degree. K) or less. The columbium addition retards the rate of recrystallization of the cold rolled product, and a wide spectrum of mechanical properties can be obtained in the final product by control of the final annealing time and temperature within the range of 1000.degree. to 1700.degree. F (about 810.degree. to 1200.degree. K). A preferred product is cold rolled and annealed strip suitable for deep drawing, porcelain enameling, hot dip metallic coating and the like, containing at least about 0.025% uncombined columbium at the hot rolling stage, as determined by analysis at room temperature, which has an average plastic strain ratio of at least 1.8, and a uniform grain size between ASTM 8 and 10.

REFERENCES:
patent: 3183078 (1965-05-01), Ohtake et al.
patent: 3333987 (1967-08-01), Schrader et al.
patent: 3522110 (1970-07-01), Shimizu et al.
patent: 3721587 (1973-03-01), Allten et al.
patent: 3761324 (1973-09-01), Elias et al.
patent: 3847682 (1974-11-01), Hook

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