High-strength plain carbon steels having improved formability

Details High-strength plain carbon steels having improved formability High-strength plain carbon steels having improved formability

1974-11-11

1976-04-27

Dean, R.

Metal treatment

Compositions

Heat treating

75123B, 75123E, 75123H, 75123N, 75123L, 148 12F, 148 123, C22C 3802

Patent

active

RE0287911

ABSTRACT:
Fully killed high-strength plain carbon steels consisting essentially of 0.06% to .20% carbon, .4% to 1.2% manganese, .005% to .3% silicon, .04% maximum sulfur, .04% maximum phosphorus, an inclusion shape control agent comprising .05% to .20% zirconium, or .01% to .10% of rare earths or .01% to .10% mischmetal, balance iron are characterized in a hot-rolled finished condition by a yield strength in excess of 35,000 p.s.i., an ultimate tensile strength in excess of 55,000 p.s.i., ductility as measured by percent elongation (2 inches) in excess of 30%, good toughness and superior formability. The steels are hot-rolled finished in the temperature range 1550.degree. F. to 1650.degree. F., cooled at a rate within the temperature range 20.degree. F. to 135.degree. F. per second and collected by coiling or piling within a temperature range of 900.degree. F. to 1200.degree. F., preferably between 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.
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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