Process for making a high toughness-high strength iron alloy

Details Process for making a high toughness-high strength iron alloy Process for making a high toughness-high strength iron alloy

1977-12-13

1979-03-27

Stallard, W.

Metal treatment

Compositions

Heat treating

148 12F, 148 124, C21D 714, C22C 3808

Patent

active

041464095

ABSTRACT:
A steel alloy is produced by a process which includes using cold rolling at room temperature and subsequent heat treatment at temperatures ranging from 500.degree. to 650.degree. C.
The resulting alloy exhibits excellent strength and toughness characteristics at cryogenic temperatures. This alloy consists essentially of about 10 to 16 percent by weight nickel, to about 1.0 percent by weight aluminum, and 0 to about 3 percent by weight of at least one of the following additional elements: copper, lanthanum, niobium, tantalum, titanium, vanadium, yttrium, zirconium and the rare earth metals, with the balance being essentially iron. The improved alloy possesses a fracture toughness ranging from 200 to 230 ksi.sqroot.in. and yield strengths up to 230 ksi.

REFERENCES:
patent: 2683677 (1954-07-01), Walters, Jr. et al.
patent: 3262777 (1966-07-01), Sadowski
patent: 3284191 (1966-11-01), Hadrean et al.
patent: 3475164 (1969-10-01), Hadrean

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