C7521白铜#洋白铜C7521耐磨铜材 The copper standard: GB/T 13808-1992 features and scope of application: composition, performance, and similar QAl10-4-4. C7521 cupronickel chemical composition: 洋白铜 标准:GB/T 13808-1992 特性及适用范围: 成分、性能和QAl10-4-4相近。 C7521白铜 化学成份: 铜 Cu :余量 锡 Sn :≤0.2 锌 Zn:≤0.6 铅 Pb:≤0.05 硼 P:≤0.1 镍 Ni:5.0~6.5 铝 Al:10.0~11.5 铁 Fe:5.0~6.5 锰 Mn:≤0.5 硅 Si :≤0.2