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 robust durability with a tensile strength range of 620-900 MPa and yield strength between 450-750 MPa, depending on temper.
High Conductivity: Electrical conductivity soaring at 25-34 MS/m, or 45-60% IACS, sets it apart from conventional bronze and brass.
Stress Relaxation Resistance: Exceptional ability to maintain over 70% residual stress at elevated temperatures of 200°C.
Formability: Outstanding cold workability with a minimum bending radius of 2× the material's thickness.
Eco-Certified: Environmentally responsible, lead-free and adheres to 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: Perfectly suited for stamping and bending, with a minimal bend radius of 2× the thickness.
- Welding: Excels with TIG/MIG methods and performs reliably in soft soldering.
- Heat Treatment:
- Soft Annealing: Engage at 600-700°C for 1-3 hours to achieve optimal softness.
- Hot Working: Efficiently performed at a temperature range of 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: Includes ASTM B888, RoHS, ELV; with availabilities of Mill Certificates.
- Testing Reports: Comprehensive reports covering mechanical properties, conductivity, and metallurgical analysis.
- Customization: Tailored options for non-standard sizes and additional surface treatments like tin or silver plating.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd.) thrives as a dynamic branch of the Huahong Group (A-STOCK : 002645.SZ), a prestigious manufacturer of Copper Alloy products in eastern China, conveniently located near Shanghai.
Specializing in the production of copper and copper alloy (admiralty brass/naval brass, aluminum brass, cupronickel/copper nickel) products such as condenser tubes, efficient heat exchange tubes, large diameter copper nickel pipes, forged flanges, oxygen-free copper products, and railway ground cables. Boasting an annual production capacity exceeding 30,000 tons, our products are integral to seawater desalination, nuclear power, petrochemical, marine, steam turbine, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit industries.
Additionally, we authored the National Standard for copper alloy seamless tubes/pipes used in Nuclear Power.
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