High strength low alloy steel containing columbium and vanadium

Details High strength low alloy steel containing columbium and vanadium High strength low alloy steel containing columbium and vanadium

1978-02-02

1979-03-06

Steiner, Arthur J.

Metal treatment

Compositions

Heat treating

75123J, 75124, C22C 3806, C22C 3812

Patent

active

041429222

ABSTRACT:
High strength low alloy steels, produced as strip or the like by hot rolling, permit unusual economy of alloying ingredients while achieving superior mechanical properties. With a composition containing specifically low carbon and low manganese, and moderate proportions of both columbium and vanadium, preferably with no requirement of silicon. Yield strengths in a range to and above 80 ksi are attainable depending on the total of columbium and vanadium, and excellent properties of toughness and formability are exhibited in transverse as well as longitudinal directions without adding special sulfide shape control agents. Processing conditions, for hot rolling and coiling, can be selected over wide temperature ranges, for convenience of control, e.g. to achieve product uniformity. Rolling load requirements are acceptable and can be reduced to facilitate production of thin strip by reducing the ratio of columbium to vanadium, without impairing the way in which columbium appears to effectuate superior realization of the strengthening effect of vanadium in those compositions.

REFERENCES:
patent: 3674570 (1972-07-01), Hallstrom et al.
patent: 3721587 (1973-03-01), Allten et al.
patent: 3725049 (1973-04-01), Satoh et al.
patent: 3997372 (1976-12-01), Matas et al.
Heitmann et al.; "Development of a Formable, Low Carbon Columbrium Bearing High Strength Hot Rolled Sheet Steel;" Soc. Aut Eng., 3/74.

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