牌号对照表
Comparison Table of Alloy Number
标准 Standard | 合金牌号 Alloy number |
| JIS | C7521 | C7701 |
| ASTM | C75200 | C77000 |
| GB | BZn18-18 | BZn18-26 |
化学成分
Chemical Composition
合金牌号 Alloy number | 化学成分% Chemical composition |
| Cu | Pb | Fe | Zn | Ni | Mn |
| C7521 | 62.0-66.0 | ≤0.03 | ≤0.25 | 余量Rem. | 16.5-19.5 | 0-0.50 |
| C7701 | 54.0-58.0 | ≤0.03 | ≤0.25 | 余量Rem. | 16.5-19.5 | 0-0.50 |
物理性能
Physical Properties
| 合金牌号Alloy number | C7521 | C7701 |
| 比重Specific gravity（g/cm³） | 8.73 | 8.7 |
| 热膨胀系数Coefficient of thermal expansion [x10-6/K](20-300℃) | 16.2 | 16.7 |
| 导热系数Thermal conductivity (W/(m·k))(20℃)] | 33 | 29 |
| 导电率Electrical conductivity (%IACS)(20℃) | 6 | 5.5 |
| 电阻率Resistivity (μΩ.cm)(20℃) | 28.7 | 31.4 |
| 比热Specific heat(J/g/20℃) | 0.380 | 0.38 |
| 弹性系数Modulus of elasticity(KN/mm2) | 125 | 125 |
机械性能
Mechanical Properties
合金牌号 Alloy number | 状态 Temper | 抗拉强度(N/mm²) Tensile strength | 延伸率(%) Elongation | 硬度(HV) Hardness | 弯曲试验 Bending test |
弯曲角度 Bending angle | 内侧半径 Inner radius |
C7521
| O | ≥375 | ≥20 | - | 180° | 0T |
| 1/2H | 440-570 | ≥5 | 120-180 | 180° | 1.0T |
| H | 540-640 | ≥3 | 150-210 | 180° | 2.0T |
| EH | ≥610 | - | ≥185 | - |
|
| C7701 | 1/2H | 540-655 | ≥8 | 150-210 | 180° | 1.5T |
| H | 630-735 | ≥4 | 180-240 | 180° | 2.0T |
| EH | 705-805 | - | 210-260 | 90° | 3.0T |
| SH | 765-865 | - | 230-270 | - | - |
