Grade
| China GB | H70 |
| American ASTM | C26000 |
| European EN | CW505L |
| Japanese JIS | C2600 |
Chemical Composition
(Weight%)
| Copper Cu | 68.5-71.5 |
| Iron Fe | ≤0.05 |
| Lead Pb | ≤0.01 |
| Tin Sn | ≤0.03 |
| Oxygen O | ≤0.02 |
| Phosphorus P | ≤0.01 |
| Zinc Zn | Remains |
Product Properties
H70 has good processability, high strength, easy welding, and strong corrosion resistance.
Application Fields
● Precision Machining ● Electronic Components ● Military Manufacturing ● Paper Wire
Fatigue Strength
The maximum stress that can withstand a certain number of cycles without fracture is fatigue strength. The standard fatigue strength of copper alloy is reported for 100,000,000 cycles.
Physical Properties
| Density | 8.53 | g/cm³ |
| Conductivity @20℃ | 28 | %IACS |
| Electrical Conductivity @20℃ | 14 | MS/m |
| Thermal Conductivity @20℃ | 123 | W/(m·K) |
| Specific Heat Capacity | 0.092 | /J.(kg.℃). t |
| Elastic Modulus | 110 | MPa |
| Poisson's Ratio | 0.34 | GPa |
| Coefficient of Thermal Expansion | 19.9 | 10 -6 /K |
Mechanical Properties
| Specifications | State | Tensile Strength | Yield Strength | Hardness | Elongation | |
| mm | MPa | ksi | MPa | HV | A% | |
| Φ0.1-0.2 | 060 | 375 | 54 | -- | 127 | ≥18 |
| >Φ0.2-0.5 | 060 | 355 | 51 | -- | 112 | ≥25 |
| >Φ0.5-2.0 | 060 | 335 | 49 | -- | 105 | ≥30 |
| >Φ2.0-8.0 | 060 | 275 | 40 | -- | 87 | ≥35 |
| Φ0.1-0.2 | H01 | 400 | 58 | -- | 125 | ≥10 |
| >Φ0.2-0.5 | H01 | 380 | 55 | -- | 120 | ≥15 |
| >Φ0.5-2.0 | H01 | 370 | 54 | -- | 115 | ≥20 |
| >Φ2.0-8.0 | H01 | 330 | 48 | -- | 103 | ≥25 |
| Φ0.1-0.2 | H02 | 410 | 59 | -- | 127 | -- |
| >Φ0.2-0.5 | H02 | 390 | 57 | -- | 123 | ≥5 |
| >Φ0.5-2.0 | H02 | 375 | 54 | -- | 117 | ≥10 |
| >Φ2.0-8.0 | H02 | 340 | 49 | -- | 107 | ≥12 |
| Φ0.1-0.2 | H03 | 540-735 | 78-107 | -- | 168-228 | -- |
| >Φ0.2-0.5 | H03 | 490-685 | 71-99 | -- | 155-213 | -- |
| >Φ0.5-2.0 | H03 | 440-635 | 64-92 | -- | 137-198 | -- |
| >Φ2.0-8.0 | H03 | 340-520 | 49-75 | -- | 107-163 | -- |
*For reference only
Corrosion Resistance
H70 exhibits good corrosion resistance in atmospheric environments. O2 forms CuO and ZnO on the brass surface, slowing down corrosion. In marine environments, corrosive ions such as CI- and So24- in seawater penetrate the surface oxide film, forming soluble complexes and accelerating corrosion.
Tolerance Accuracy
| Specifications | Tolerance | Straight Bar Length | |||
| mm | Coil mm |
Straight Bar mm |
Specifications | Length m |
Length Tolerance mm |
| 0.3-1.0 | 0.01 | -- | -- | -- | -- |
| >1.0-2.0 | 0.02 | 0.02 | 1.5-<1.8 | 0.5-1.0 | ±10mm |
| >2.0-4.0 | 0.02 | 0.03 | 1.8-2.5 | 0.5-2.0 | ±10mm |
| >Φ4.0-6.0 | 0.03 | 0.04 | >2.5-5.0 | 1.0-2.5 | ±10mm |
| >6.0-9.0 | 0.03 | 0.04 | >5.0-9.0 | 1.0-2.5 | ±10mm |
| >9.0-12.0 | 0.04 | 0.05 | >9.0 | 2.0-3.0 | ±10mm |
Supply Method
| Specifications | Standard Roll Weight | Inner Diameter of Roll |
| mm | kg | mm |
| 0.1-0.3 | 1-5 | Shaft Loading |
| 0.5-0.8 | 5-12 | Shaft Loading, 160-200 |
| 0.8-1.1 | 15-25 | 270-300 |
| 0.8-1.6 | 200-500 | Shaft Loading |
| 0.8-1.6 | 100-250 | Paper Tube Packaging |
| 0.8-1.7 | 10-15 | Layer Wound Shaft Loading |
| 0.7-2.0 | 300-500 | Iron Frame Packaging |
| 1.1-1.6 | 18-30 | 260-300 |
| 1.6-2.5 | 25-40 | 320-350 |
| 2.8-6.5 | 30-45 | 370-400 |
| 4.0-6.5 | 100-250 | 400-650 |
| 6.5-10.0 | 50-100 | 400-650 |
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