High strength deep drawing steel developed by reaction with ammo

Details High strength deep drawing steel developed by reaction with ammo High strength deep drawing steel developed by reaction with ammo

1996-12-23

1998-06-30

Yee, Deborah

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148226, 148228, 148230, 148318, C23C 826, C21D 804, C21D 106

Patent

active

057727953

ABSTRACT:
A method of producing high strength steel sheet and formed articles fabricated from the sheet and containing about 0.01-0.3 free and uncombined atomic percent Ti, Nb or V as strengthening element, by hot rolling or hot rolling plus cold rolling the sheet within limited temperature ranges, annealing the rolled sheet or formed articles at a temperature of about 1275.degree.-1350.degree. F. to provide a (111) grain structure, nitriding the annealed sheet or formed article in an annealing furnace at a temperature of about 800.degree.-1250.degree. F. under fully developed laminar gas flow, and controlling the strengthening of the steel article as a function of steel composition, the nitriding gas composition, nitriding time, nitriding temperature, thickness of the steel sheet and depth of strengthening desired, in accordance with specified relationships, to provide a steel article having an 0.2% off-set yield strength after temper rolling of at least about 40 ksi and an r value in excess of about 1.7 for the cold rolled sheet.

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patent: 4710238 (1987-12-01), Dawes et al.
patent: 4846899 (1989-07-01), Wilson
H. J. Grabke, "Kinetics of Phase Boundary Reactions Between Gases and Metals", Proceedings of AGARD (NATO) Conference on Reactions Between Gases and Solids, Oct. 1969, WPAFB, Dayton, Ohio.
M. Kitamura et al., "Efect of Carburizing aftrer Recystallization on Formability and Bake Hardenablity of Ultra Low Carbon Ti-Added Cold-Rolled Sheet Steels," Irong and Steel Research Laboratories, Kobe Steel, Ltd., Kakogawa, Japan, Int. Iron & Steel Jour., 1994, pp. 115-122.

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