Patent ID: 9017491
Filing Date: 2015-04-28
Classification: B21J,C22C,C22F,F16L

Abstract:
1. A hot-forged copper alloy part which has a tubular shape, wherein an alloy composition contains 59.0 mass % to 84.0 mass % of Cu and 0.003 mass % to 0.3 mass % of Pb with a remainder of Zn and inevitable impurities, a content of Cu [Cu] mass % and a content of Pb [Pb] mass % have a relationship of 59≦[Cu]+0.5×[Pb])≦64, a shape of the forged part satisfies a formula of 0.4≦(average inner diameter)/(average outer diameter)≦0.92, 0.04≦(average thickness)/(average outer diameter)≦0.3, and 1≦(tube axis direction length)/(average thickness)≦10, and a forging material which is to be hot-forged has a tubular shape and satisfies 0.3≦(average inner diameter/average outer diameter)≦0.88, 0.06≦(average thickness)/(average outer diameter)≦0.35, and 0.8≦(tube axis direction length)/(average thickness)≦12, and 0%≦(degree of uneven thickness)≦30%, 0≦(degree of uneven thickness)≦75×1/((tube axis direction length)/(average thickness))