Claims
- 1. Cold worked and stress-relieved bar, rod and wire, having ultimate tensile strengths ranging from about 125 to about 300 ksi and a percent elongation (sample length 4 times diameter) of not less than 15%, formed by cold reducing at least 50% in thickness and stress-relieving a non-heat hardenable ferritic stainless steel consisting essentially of, by weight percent, from about 11 to about 30% chromium, up to about 0.1% carbon, up to about 1% manganese, and balance iron.
- 2. cold worked and stress-relieved bar, rod, and wire, as claimed in claim 1, wherein said ferritic stainless steel additionally contains up to about 4% molybdenum, up to about 0.25% aluminum, up to about 0.50% titanium, up to about 0.30% columbium, or up to about 2% nickel.
- 3. cold headed fastener blanks having an ultimate tensile strength of at least about 125 ksi and a percent elongation (sample length 4 times diameter) of not less than 15%, fabricated from a cold reduced and stress-relieved non-heat hardenable ferritic stainless steel consisting essentially of, by weight percent, from about 11 to about 30% chromium, up to about 0.1% carbon, up to about 1% manganese and balance iron.
- 4. Helical springs having an ultimate tensile strength of at least about 200 ksi and a precent elongation (sample length 4 times diameter) of not less than 15%, fabricated from a repetitively cold reduced and stress-relieved non-heat hardenable ferritic stainless steel consisting essentially of, by weight percent, from about 11% to about 30% chromium, up to about 0.1% carbon, up to about 1% manganese, and balance iron.
Parent Case Info
This is a division of application Ser. No. 434,397, filed Jan. 18, 1974 now U.S. Pat. No. 3,888,119.
US Referenced Citations (4)
Non-Patent Literature Citations (3)
Entry |
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. |
Divisions (1)
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Number |
Date |
Country |
Parent |
434397 |
Jan 1974 |
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