Metal treatment – Process of modifying or maintaining internal physical... – Magnetic materials
Patent
1979-11-08
1981-09-01
Skiff, Peter K.
Metal treatment
Process of modifying or maintaining internal physical...
Magnetic materials
148 12D, 148 315, 204 37R, 4273839, C23C 102, C22C 2110, C23F 1700
Patent
active
042870089
ABSTRACT:
This invention relates to an aluminum-zinc alloy coated ferrous product whose coating is highly ductile, and to the method whereby such improved coating ductility may be realized. The process is characterized by the steps of thermally treating the aluminum-zinc alloy coated product by heating to a temperature between about 200.degree. F. (93.degree. C.) and 800.degree. F. (427.degree. C.) and holding for a period of time to effect metallurgical structure changes, among them being the precipitation of a second phase incoherent with the matrix, followed by slow cooling to at least 400.degree. F. (205.degree. C.). The resulting product is characterized by an aluminum-zinc alloy coating with a hardness no greater than about 115 VHN, and preferably no greater than about 110 VHN.
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Borzillo Angelo R.
Shin Paik W.
Torok Theodore E.
Bethlehem Steel Corporation
Noll William B.
O'Keefe Joseph J.
Skiff Peter K.
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