Metal treatment – Compositions – Heat treating
Patent
1975-03-26
1977-05-10
Satterfield, Walter R.
Metal treatment
Compositions
Heat treating
148 12EA, 148 115R, 72140, 267166, 428592, C22C 3840
Patent
active
040226409
ABSTRACT:
A method of cold-working and stress-relieving iron-chromium ferritic stainless steels of non-heat hardenable type in the AISI 400 series, thereby increasing the ultimate tensile strength while maintaining good tensile ductility. Cold-working is effected by peripherally contacting the steel, i.e., extruding and/or die drawing, to produce a "cellular structure" not attainable in cold rolling. Repetitive cold-working and stress-relief anneals between about 750.degree. and 1200.degree. F increase the ultimate tensile strength in increments and restore the tensile ductility substantially to that of the hot rolled and annealed material, while maintaining the tensile to yield ratio substantially constant. Ultimate tensile strength up to about 400 ksi in small diameter wire is attainable.
REFERENCES:
patent: 2527521 (1950-10-01), Bloom
patent: 2767837 (1956-10-01), Nachtman et al.
patent: 3389991 (1968-06-01), Tanczyn
patent: 3694192 (1972-09-01), Brickner et al.
Machine Design, Dec. 14, 1967, pp. 104-106.
Alloy Digest, SS-277 Stainless Steel, Aug. 1972, Engr. Alloy Digest Inc., Upper Montclair, N. J.
Bar and Allied Products, Met. Soc. of AIMME, vol. 13, 1961, Earhart & Griffin, Interscience Pub., N.Y. pp. 69-73, 90 and 91.
Armco Steel Corporation
Satterfield Walter R.
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