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: Experience unparalleled durability with a tensile strength ranging from 620-900 MPa and a yield strength between 450-750 MPa, tailored to your specific temper requirements.
High Conductivity: Achieve maximum efficiency with electrical conductivity of 25-34 MS/m, outperforming typical bronze and brass with 45-60% IACS.
Stress Relaxation Resistance: Withstands demanding conditions, maintaining over 70% residual stress even at 200°C.
Formability: Offers exceptional cold workability, allowing a minimum bending radius of 2× thickness for versatile applications.
Eco-Certified: Eco-friendly and sustainable, our copper alloy is lead-free and fully compliant with RoHS & 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: Optimized for stamping and bending with ease, offering a minimal bend radius of 2× thickness.
- Welding: Achieve superior results with recommended TIG/MIG methods, while soft soldering remains highly effective.
- Heat Treatment:
- Soft Annealing: Carefully controlled at 600-700°C for 1-3 hours to achieve desired softness.
- Hot Working: Best performed at 800-950°C to ensure optimal malleability.
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, with compliance to RoHS and ELV. Mill Certificates are readily available.
- Testing Reports: Comprehensive reports covering mechanical properties, conductivity, and metallurgical analysis are provided.
- Customization: Tailor your needs with bespoke sizes and surface treatments including tin and silver plating options.
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 prestigious Copper Alloy products manufacturer based in eastern China, conveniently located near Shanghai.
We specialize in producing a diverse range of copper and copper alloy products including:admiralty brass/naval brass, aluminum brass, cupronickel/copper nickel. Our portfolio includes 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 are integral to industries such as seawater desalination, nuclear power, petrochemical, marine engineering, steam turbines, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit.
And we have authored the National Standard for copper alloy seamless tube/pipe used in Nuclear Power! Ready to lead the industry with unmatched standards and innovations.
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