Method of manufacturing copper alloy hot forgings and copper alloy hot forging

摘要

Co and 0.21~0.44mass%, and P of 0.06~0.13mass%, and Sn of 0.003~0.08mass%, copper alloy hot forging, 0.00003 to 0. It is an alloy composition containing O and 0030mass%, the balance being inevitable impurities and Cu, while the content of Co and [Co] mass% content of P and [P] mass%, and 3.1 ≦ I have a relationship of ([Co] -0.005) / ([P] -0.006) ≦ 4.9. In the cross-sectional metal structure, sum of the ratio of recrystallized grains group is 0.050~0.50mm average grain size of recrystallized grains, the ratio of non-recrystallized grains is 80% or more.