Brass alloy

Details Brass alloy Brass alloy

1996-03-13

1997-05-20

Sheehan, John

Alloys or metallic compositions

Copper base

Zinc containing

148434, 2989012, C22C 901

Patent

active

056309848

ABSTRACT:
A brass alloy having a composition (wt %) as follows: Cu: 57-65%; Bi: 0.3-1.5%; Al: 0.4-0.8%; B: 5-15 ppm; impurities 0-1%, and Zn as remainder. A brass alloy whose Cu content is set to 57-65 wt % and whose further alloying constituents do not exceed 3 wt % can be cast into a chill mold without any problems and, additionally, solidifies from the melt relatively finely grained and thus virtually free of shrinkholes. Further, grain refining with boron is possible in spite of a Cu content that is increased compared to the known alloys, if the elements Mn, Si and Sb are added by alloying in amounts according to the invention and if, simultaneously, the Fe content can be limited to a maximum of 0.25 wt %. Furthermore, the alloy is provided with enhanced hot shortness if the Sn content is as low as possible but, at least, does not exceed 0.25 wt %. The occurrence of hard inclusions is strongly repressed.

REFERENCES:
patent: 5137685 (1992-08-01), McDevitt et al.
patent: 5288458 (1994-02-01), McDevitt et al.
patent: 5360591 (1994-11-01), Ruetz et al.
Nishikiori et al., "Free-cutting copper alloys etc.", JP 61,133,351, Jun. 20, 1986, Chemical Abstracts, vol. 106, p. 270, 1987, Abstract.

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