High-strength low-alloy steels having improved formability

Details High-strength low-alloy steels having improved formability High-strength low-alloy steels having improved formability

1974-11-11

1976-04-27

Dean, R.

Metal treatment

Compositions

Heat treating

75123B, 75123E, 75123H, 75123N, 75123J, 148 12F, 148 123, C22C 3804

Patent

active

RE0287903

ABSTRACT:
Fully killed high-strength low-alloy steels consisting essentially of .06% to .20% carbon, .50% to 1.4% manganese, .01% to .08% columbium or .04% to .12% vanadium, .05% maximum silicon, .04% maximum sulfur, .04% maximum phosphorus and an inclusion shape-control agent comprising either .06% to .20% zirconium, 0.1% to .10% of a rare earth or .01% to .10% mischmetal are characterized in a hot-rolled finished condition by yield strengths in excess of 45,000 p.s.i., ultimate tensile strengths in excess of 60,000 p.s.i., ductilities as measured by percent elongation (2 inches) in excess of 20%, good toughness, superior formability and reduced directionality. The steels are hot-rolled finished in the temperature range 1550.degree. F. to 1650.degree. F., cooled at a rate within the range 20.degree. F. to 135.degree. F. per second and collected by coiling or piling within a temperature range of 1025.degree. F. to 1175.degree. F.

REFERENCES:
patent: 2360717 (1944-10-01), Phelps
patent: 2683662 (1954-07-01), Tisdale et al.
patent: 3102831 (1963-09-01), Tisdale
patent: 3333987 (1967-08-01), Schrader et al.
patent: 3375105 (1968-03-01), Lynch
Lichy et al., Control of Sulfide Shape in Low Carbon Al-Killed Steel, Journal of Metals, July 1965, pp. 769-775.

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