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
High Strength: Tensile strength 620-900 MPa, yield strength 450-750 MPa (varies by temper).
High Conductivity: Electrical conductivity 25-34 MS/m (45-60% IACS), superior to standard bronze/brass.
Stress Relaxation Resistance: Maintains >70% residual stress at 200°C.
Formability: Excellent cold workability (minimum bending radius: 2× thickness).
Eco-Certified: Lead-free, compliant with RoHS & ELV.
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: Suitable for stamping/bending (min. bend radius: 2× thickness).
- Welding: Recommended methods: TIG/MIG (excellent), soft soldering (good).
- Heat Treatment:
- Soft Annealing: 600-700°C ×1-3h
- Hot Working: 800-950°C
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: ASTM B888, RoHS, ELV; Mill Certificates available.
- Testing Reports: Mechanical properties, conductivity, metallurgical analysis.
- Customization: Non-standard sizes, surface treatments (tin/silver plating).
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd. ) is a Branch of Huahong Group (A-STOCK : 002645.SZ), a famous Copper Alloy products manufacturer in eastern China, near to Shanghai.
We are specializing at the production of copper and copper alloy (admiralty brass/naval brass, aluminum brass, cupronickel/copper nickel) condenser tube, efficient heat exchange tube, large diameter copper nickel pipe, copper alloy forged flanges, oxygen-free copper products and railway ground cable, has been formed annual production capacity of more than 30000 tons of copper products. Products are widely used on seawater desalination, nuclear power, petrochemical, marine, steam turbine, pressure vessels, heat exchangers, central air-conditioning, household appliances and railway transit, etc.
And we wrote the National Standard of copper alloy seamless tube/pipe for Nuclear Power!
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