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US 11,028,466 B2Granted
Unleaded free-cutting brass alloys with excellent castability, method for producing the same, and application thereof
AssigneeFortune Mfg. Co., Ltd.
InventorsChin-Lung Chen, Jhewn-Kuang Chen, Ci-Jie Hung
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Abstract
The present invention is directed to an unleaded free cutting brass alloy with excellent machinability, leak-tightness, reca stability, and mechanical properties, wherein the brass alloy comprises 65 to 75 weight % of copper, 22.5 to 32.5 weight % of zinc, 0.5 to 2.0 weight % of silicon, and other unavoidable impurities; wherein the total content of copper and zinc in the brass alloy is 97.5 weight % or more.
Claims19
An unleaded free-cutting brass alloy, comprising:
- copper:
- 68 to 75 weight %,
- zinc:
- 22.5 to <30 weight %,
- silicon:
- 1.0 to 2.0 weight %,
- at least one element selected from the group consisting of 0.01 to 0.8 weight % of nickel and 0.01 to 0.55 weight % of antimony, and
- unavoidable impurities,
- wherein the total content of copper and zinc in the brass alloy is 97.5 weight % or more, and
- wherein the γ-phase of the brass alloy is uniformly distributed between phase boundaries of the α-phase and the β-phase of the brass alloy in a granular shape.
7 more elements
Dependencies are inferred from the claim text.