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: Delivering exceptional tensile strength ranging from 620 to 900 MPa, alongside an impressive yield strength between 450 and 750 MPa, depending on the temper.
High Conductivity: Offering outstanding electrical conductivity between 25 and 34 MS/m, equating to 45-60% IACS, surpassing the conventional bronze or brass.
Stress Relaxation Resistance: Ensures more than 70% residual stress retention even at elevated temperatures of 200°C.
Formability: Exhibits superior cold workability with a minimum bending radius of 2 times the thickness.
Eco-Certified: Environmentally friendly, being 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: Perfectly suited for stamping and bending processes, with a minimum bend radius of 2 times the thickness.
- Welding: Optimal welding methods include TIG/MIG (excellent results), with good outcomes in soft soldering.
- Heat Treatment:
- Soft Annealing: Ideal conditions involve 600-700°C maintained for 1 to 3 hours.
- Hot Working: Requires a temperature range of 800-950°C for best results.
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: Adheres to ASTM B888, RoHS, and ELV standards; Mill Certificates available upon request.
- Testing Reports: Comprehensive reports covering mechanical properties, conductivity, and metallurgical analysis.
- Customization: Offers non-standard sizes and a range of surface treatments, including tin and silver plating.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd. ) is a prestigious branch of the renowned Huahong Group (A-STOCK : 002645.SZ). Situated near Shanghai, it is a celebrated manufacturer of Copper Alloy products in eastern China.
We specialize in producing a diverse range of copper and copper alloy products, including (admiralty brass/naval brass, aluminum brass, cupronickel/copper nickel) condenser tubes, efficient heat exchange tubes, large diameter copper nickel pipes, copper alloy forged flanges, and oxygen-free copper products. Our extensive portfolio supports an annual production capacity exceeding 30,000 tons. These products find applications across seawater desalination, nuclear power, petrochemical industries, marine environments, steam turbines, pressure vessels, heat exchangers, central air-conditioning systems, household appliances, and railway transit sectors.
Additionally, we have authored the National Standard for copper alloy seamless tubes/pipes utilized in Nuclear Powerinstallations!
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