Steel material for a colored spring

Details Steel material for a colored spring Steel material for a colored spring

1994-03-11

1995-10-03

Zimmerman, John

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428629, 428658, 428677, 428941, B32B 1518, B32B 1520

Patent

active

054551218

ABSTRACT:
A steel material for colored springs is formed with a metallic deposit on the surface. The metallic deposit contains copper, zinc, and chromium. In an annealing process, copper and zinc diffuse in the deposit to exhibit a gold color tone while chromium is oxidized to exhibit a dark gray color tone. The combination of these color tones exhibits a beautiful black color tone which is distinguishable from a normal spring. The deposit improves the formability in the spring shaping process.

REFERENCES:
patent: 2490700 (1949-12-01), Nachtman
patent: 3634147 (1972-01-01), Helwig et al.
patent: 3778315 (1973-12-01), Booker et al.
patent: 3966183 (1976-06-01), Mayer
patent: 4036206 (1977-07-01), Straub
patent: 4931317 (1990-06-01), Shima et al.
JP-A-57 190 139, Shin Nippon Seitetsu, vol. 7, No. 41 (M-194) (1186), Coated Spring, Nov. 1982 & Feb. 18, 1983.
JP-A-63 026 383, Sawahira K.K., vol. 12, No. 237 (C-509) (3084), Jul. 6, 1988 & Feb. 3, 1988.

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