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: Exhibiting impressive tensile strength ranging from 620 to 900 MPa, alongside a yield strength of 450 to 750 MPa, which varies depending on the temper.
High Conductivity: With electrical conductivity between 25-34 MS/m (or 45-60% IACS), this alloy surpasses the typical capabilities of standard bronze and brass counterparts.
Stress Relaxation Resistance: Outstandingly retains over 70% residual stress even at elevated temperatures of 200°C.
Formability: Excelling in cold workability with a minimum bending radius of just 2 times the material's thickness.
Eco-Certified: Environmentally friendly and lead-free, fully compliant with RoHS and ELV standards.
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: Ideal for processes such as stamping and bending, maintaining a minimal bend radius of 2 times the thickness.
- Welding: Suggested welding methods include TIG/MIG for excellent results, and soft soldering for good outcomes.
- Heat Treatment:
- Soft Annealing: Conduct at 600-700°C for a duration of 1-3 hours.
- Hot Working: Optimal processing at temperatures ranging from 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: Certified under ASTM B888, with additional RoHS and ELV endorsements; Mill Certificates can be provided upon request.
- Testing Reports: Includes detailed assessments of mechanical properties, electrical conductivity, and metallurgical analysis.
- Customization: Offers customization options with non-standard sizes and surface treatments such as tin or silver plating.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd.) operates as a distinguished branch of the renowned Huahong Group (A-STOCK: 002645.SZ), a leading manufacturer of copper alloy products strategically located in eastern China, in proximity to Shanghai.
We are specializing at the production of copper and copper alloy (admiralty 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. Our production capabilities boast an impressive annual output of over 30,000 tons of copper products. These products are extensively used in various sectors such as seawater desalination, nuclear power, petrochemical, marine, steam turbine, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit, among others.
And we wrote the National Standard of copper alloy seamless tube/pipe for Nuclear Power!
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