manganese bronze

noun
an alloy that is about 55 percent copper, 40 percent zinc, and up to 3.5 percent manganese.

Origin:
1830–40

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World English Dictionary
manganese bronze
 
n
any of various alloys containing copper (55--60 per cent), zinc (35--42 per cent), and manganese (about 3.5 per cent)

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The screw propellers are of manganese bronze and are four-bladed.
The three-layer design of this coin called for top and bottom layers of manganese bronze that enclosed a central core of copper.
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