Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1977-01-24
1978-07-18
Rutledge, L. Dewayne
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
751575, 148160, C22C 904
Patent
active
041013174
ABSTRACT:
The present invention provides copper base alloys containing copper and zinc as the main components with additions of tin, lead, nickel, iron and beryllium and one of the objects of the present invention is to increase not only the corrosion resistance, but also, the machinability by defining the range of the composition as 63.0-66.0 wt.% copper, 1.2-2.0 wt.% tin, 1.0-2.0 wt.% lead, 0.1-1.0 wt.% iron, 2.0 wt.% or less of nickel, 0.1 wt.% or less of beryllium and the rest being zinc with inevitable impurities. In another aspect of the invention, the above composition is subjected to a heat treatment between about 350.degree. and 550.degree. C for about 1 to 10 hours after hot and cold working which produces a further significant improvement in machinability without decreasing either the corrosion resistance or the mechanical properties.
REFERENCES:
patent: 1887500 (1932-11-01), Crampton et al.
patent: 2123840 (1938-07-01), Bunn
patent: 3166410 (1965-01-01), Hanson
patent: 3369893 (1968-02-01), Opie et al.
patent: 3404977 (1968-10-01), Hopper
Rutledge L. Dewayne
Skiff Peter K.
Toyo Valve Co., Ltd.
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