FREE-CUTTING COPPER ALLOY AND METHOD FOR MANUFACTURING FREE-CUTTING COPPER ALLOY
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Mar 21, 2024
app pub date -
Nov 30, 2020
filing date -
Dec 11, 2019
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Free-cutting copper alloy comprises Cu: more than 59.7% but less than 64.7%, Si: more than 0.60% but less than 1.30%, Pb: more than 0.001% but less than 0.20%, Bi: more than 0.001% but less than 0.10 mass %, and P: more than 0.001% but less than 0.15%, with remainder being Zn and unavoidable impurities, wherein total amount of Fe, Mn, Co, and Cr is less than 0.45%, the total amount of Sn and Al is less than 0.45%, 56.7≤Cu−4.7×Si+0.5×Pb+0.5×Bi−0.5×P≤59.7 and 0.003≤Pb+Bi<0.25 are satisfied, 0.02≤Bi/(Pb+Bi)≤0.98 is satisfied if 0.003≤Pb+Bi<0.08, 0.01≤Bi/(Pb+Bi)≤0.40 or 0.85≤Bi/(Pb+Bi)≤0.98 is satisfied if 0.08≤Pb+Bi<0.13.
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