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: Exhibits impressive tensile strength ranging from 620 to 900 MPa and yield strength between 450 and 750 MPa, adapting with temper variations.
High Conductivity: Offers outstanding electrical conductivity between 25 to 34 MS/m, translating to 45-60% IACS, surpassing conventional bronze and brass.
Stress Relaxation Resistance: Ensures superior stress relaxation resistance, retaining over 70% of residual stress even at elevated temperatures of 200°C.
Formability: Boasts excellent cold workability, with a minimal bending radius of just 2 times the thickness, ensuring ease of manufacturing.
Eco-Certified: Certified lead-free, aligning with RoHS and ELV standards for environmentally conscious applications.
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: Perfect for stamping and bending processes, with a minimum bend radius of twice the thickness for structural integrity.
- Welding: Welding techniques include TIG and MIG, which are excellent for this material, alongside good soft soldering capabilities.
- Heat Treatment:
- Soft Annealing: Maintain temperatures between 600-700°C for 1 to 3 hours for optimal annealing results.
- Hot Working: Process between 800-950°C for maximum efficiency and material performance.
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: Compliant with ASTM B888, RoHS, and ELV, with mill certificates readily available to verify quality.
- Testing Reports: Comprehensive reports on mechanical properties, electrical conductivity, and metallurgical analysis are available.
- Customization: Offers customization for non-standard sizes and surface treatments like tin and silver plating.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd.) is a proud branch of the renowned Huahong Group (A-STOCK: 002645.SZ). Situated in eastern China, near Shanghai, it specializes in premium copper alloy products.
We are experts in manufacturing copper and copper alloy (such asadmiralty brass/naval brass, aluminum brass, cupronickel/copper nickel) condenser tubes, efficient heat exchange tubes, large diameter copper nickel pipes, forged copper alloy flanges, oxygen-free copper products, and railway ground cables. Our extensive production capacity exceeds 30,000 tons annually, serving industries like seawater desalination, nuclear power, petrochemicals, marine, steam turbines, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit.
In addition, we have authored the National Standard for copper alloy seamless tubes and pipes utilized in Nuclear Power.
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