Product Details for CuNi3Si1Mg (C70250)
1. Core Specifications
| Item |
Details |
| Grade |
CuNi3Si1Mg (UNS C70250) |
| Standard |
ASTM B888, RoHS & ELV Compliant |
| Composition |
Cu (Balance), Ni 3%, Si 0.65%, Mg 0.15%, Pb <0.05% |
| Material Type |
Precipitation-Hardened High Copper Alloy |
2. Key Advantages
Remarkable Strength: Exhibits impressive tensile strength ranging from 620-900 MPa and a yield strength of 450-750 MPa, depending on the temper, making it ideal for demanding applications.
Exceptional Conductivity: Boasting electrical conductivity between 25-34 MS/m, equivalent to 45-60% IACS, this alloy surpasses standard bronze and brass options.
Stress Relaxation Resistance: Retains over 70% of its residual stress even at elevated temperatures of 200°C, ensuring long-term performance stability.
Outstanding Formability: Features excellent cold workability, allowing for a minimum bending radius of 2× the material thickness.
Eco-Certified: Complies fully with RoHS & ELV regulations, being a lead-free choice for environmentally conscious applications.
3. Typical Applications
| Industry |
Applications |
| Electronics |
High-density connectors, CPU sockets, relay springs, micro-switch contacts |
| Automotive |
Fuel injection components, sensor terminals, battery connectors |
| Industrial Equipment |
High-temperature springs, solenoid coils, precision instrument contacts |
| Renewable Energy |
PV junction boxes, EV charging port components |
4. Physical & Mechanical Properties
| Parameter |
Typical Value |
Test Standard |
| Density |
8.82 g/cm³ |
ISO 1183 |
| Thermal Conductivity |
190 W/(m·K) |
ASTM E1461 |
| Thermal Expansion (0-300°C) |
17.6×10-6/K |
ASTM E228 |
| Elastic Modulus |
131 GPa |
ASTM E111 |
| Hardness (HV) |
180-270 (depends on temper) |
ASTM E384 |
5. Processing & Heat Treatment
- Cold Working: Optimal for stamping and bending processes with a minimum bend radius of 2× the material thickness.
- Welding: Recommended welding techniques include TIG and MIG, which offer excellent results, while soft soldering provides good adherence.
- Heat Treatment:
- Soft Annealing: Conduct at 600-700°C for 1-3 hours to achieve desired softness.
- Hot Working: Perform at temperatures between 800-950°C to maintain structural integrity.
6. Available Forms & Dimensions
| Form |
Size Range |
Custom Options |
| Strip |
Thickness: 0.1mm-5.0mm, Width: ≥3mm |
Hot-dip tinned, contour-milled, coatings |
| Sheet |
Thickness: 0.5mm-10mm |
Mechanical/electrolytic polishing |
| Wire |
Diameter: 0.5mm-20mm |
Precision cold-drawn/polished |
| Tube |
OD: 3mm-50mm, Wall: 0.2mm-5mm |
Seamless/welded customization |
7. Certifications & Support
- Certifications: Fully certified under ASTM B888, RoHS, and ELV standards. Comprehensive Mill Certificates are provided with each batch.
- Testing Reports: Detailed reports available, covering mechanical properties, conductivity, and metallurgical analysis.
- Customization: Offers non-standard sizes and specialized surface treatments, such as tin or silver plating, tailored to your specific needs.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd.) operates as a pivotal branch of the esteemed Huahong Group (A-STOCK: 002645.SZ), renowned for its high-quality Copper Alloy products. Situated in eastern China, close to the bustling city of Shanghai.
We specialize in producing copper and copper alloy products such asadmiralty brass/naval brass, aluminum brass, cupronickel/copper nickel) condenser tubes, efficient heat exchange tubes, large diameter copper nickel pipes, copper alloy forged flanges, oxygen-free copper products, and railway ground cables. With an impressive annual production capacity exceeding 30,000 tons, our products find applications across a wide spectrum of industries including seawater desalination, nuclear power, petrochemical, marine, steam turbine, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit.
Moreover, we have authored the National Standard for copper alloy seamless tubes/pipes dedicated to Nuclear Power, solidifying our position as industry leaders.
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