PURPOSE: To obtain a corrosion-resistant copper alloy excellent in resistance to sea water erosion which contains Ni and Fe in defined ranges, and one or more of In, Pd and Pt and optionally Mn in defined ranges.
CONSTITUTION: The corrosion-resistant copper alloy containing Ni and Fe represented by the hatched coordinates shown in the drawing with the ranges of 4.5W3.2wt% Ni and 0.3W2.5% Fe, one or more of 0.01W1.0% In, 0.003W0.2% Pd and 0.003W0.1% Pt, optionally up to 1.0% Mn, and the balance Cu and ordinary impurities is the improvement of Cupronickel and improved in its resistance to sea water erosion without the necessity of any special heat treatment. Among said alloying components, Ni improves corrosion resistance, and Fe remarkably improves the erosion resistance by its conjunct addition with In, Pd, Pt etc.. Mn improves castablilty and workability without injuring the corrosion resistance.
YAMAMOTO HIROSHI
SADA KENJI
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