Cost-Effective copper alloy
MNEX™
C41125
Next-generation Cost-Effective copper alloy. The world's first Cu-Zn based alloy contributing to the excellent terminal performance and low cost. It is an innovative material that overcomes the deterioration of the spring properties under the high temperature or corrosive environment which was a weak point of the conventional Cu-Zn system. It contributes to the demonstration of the excellent terminal performance and low cost.
Positioning map
A copper alloy for general-purpose automotive terminals. It offers an excellent balance of strength and bendability while maintaining superior stress relaxation resistance. Its properties make it suitable for a variety of applications.
Main features
- Excellent in balance between strength · bending workability · conductivity
- Excellent resistance to stress relaxation
- Excellent resistance to stress corrosion cracking
- Excellent cost effectiveness
- Possible to process reflow-Sn plating with excellent surface quality and whisker resistance
Chemical composition
(Weight %)
| Zn | Ni | Sn | Fe | P | Cu |
|---|---|---|---|---|---|
| 10 | 0.6 | 0.6 | 0.01 | 0.04 | Rem. |
Technical Data
Physical properties
| Property | Representative Value |
|---|---|
| Specific Gravity (297K) |
8.8 |
| Coefficient of Thermal Expansion (×10-6/K : 293～573 K) |
18.4 |
| Thermal Conductivity (W/(m・K) : 293 K) |
138 |
| Volume Resistivity (µΩm : 293 K) |
0.057 |
| Electrical Conductivity (%IACS : 293 K) |
30 |
| Modulus of Elasticity (kN/mm²: 293 K) |
123 |
Mechanical properties
| Temper | Typical values | |||
|---|---|---|---|---|
| H | EH | H | EH | |
| Tensile Strength (N/mm²) |
500〜600 | 550〜650 | 541 | 580 |
| 0.2% Yield Strength (N/mm²) |
450〜550 | 500〜600 | 508 | 546 |
| Elongation (%) |
7Min. | 3Min. | 11 | 10 |
| Elastic Limit※1 Kb0.1(N/mm²) |
(350Min.) | (400Min.) | (493) | (589) |
| Vickers Hardness※2 (HV) |
(150〜190) | (160〜210) | (168) | (182) |
Stress relaxation resistance
The residual stress ratio of MNEX 10 is shown on the right. MNEX 10 has excellent stress relaxation characteristics among copper alloys and has extremely high reliability as a terminal material.
Exposure temperature: 150℃ Good Way (bending axis perpendicular to rolling
direction)
Bending stress: 0.2% of 80% proof stress
Bending workability
| Temper | Sampling Direction (to the rolling direction) |
Bending Inside Radius (mm) R | Evaluation | ||||||
|---|---|---|---|---|---|---|---|---|---|
| 0.0 | 0.1 | 0.125 | 0.15 | 0.2 | 0.25 | 0.40 | R/t | ||
| H | 0°:(Good Way) | △ | ○ | ○ | ○ | ○ | ◎ | ◎ | 0.0 |
| 90°:(Bad Way) | △ | ○ | ○ | ○ | ○ | ◎ | ◎ | 0.0 | |
| EH | 0°:(Good Way) | △ | △ | △ | ○ | ○ | ○ | ◎ | 0.0 |
| 90°:(Bad Way) | ▲ | ▲ | △ | △ | △ | △ | ○ | 0.5 | |
Fatigue property
MNEX 10 has equivalent or higher fatigue characteristics than phosphor bronze for spring and brass.
