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: The CuNi3Si1Mg piping boasts impressive tensile strength ranging from 620 to 900 MPa and yield strength between 450 and 750 MPa, tailored by temper to meet diverse demands.
High Conductivity: With superior electrical conductivity of 25-34 MS/m, equivalent to 45-60% IACS, this material outshines standard bronze and brass, making it ideal for demanding applications.
Stress Relaxation Resistance: Remarkably, it maintains over 70% residual stress even at elevated temperatures of 200°C, ensuring reliability and performance.
Formability: Featuring excellent cold workability, with a minimum bending radius of just 2× the thickness, it's engineered for ease of forming.
Eco-Certified: This lead-free product is in full compliance with RoHS & ELV standards, reinforcing its eco-friendly credentials.
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 tasks, with a recommended minimum bend radius of 2× thickness for precise results.
- Welding: Highly suitable for TIG/MIG welding, delivering excellent performance, and good results with soft soldering.
- Heat Treatment:
- Soft Annealing: Achieved at temperatures of 600-700°C for 1-3 hours, ensuring optimal material softness.
- Hot Working: Effective within 800-950°C, facilitating efficient processing.
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 with ASTM B888, RoHS, and ELV; complete mill certificates available for assurance.
- Testing Reports: Comprehensive testing includes mechanical property assessments, conductivity measurements, and metallurgical analyses.
- Customization: Offers non-standard sizes and specialized surface treatments such as tin and silver plating to meet unique requirements.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd.) is a proud branch of the esteemed Huahong Group (A-STOCK: 002645.SZ), a renowned manufacturer of Copper Alloy products located in eastern China, conveniently near Shanghai.
We are specializing at the production of copper and copper alloy (admiralty brass/naval brass, aluminum brass, cupronickel/copper nickel) condenser tubes, high-efficiency heat exchange tubes, large diameter copper nickel pipes, copper alloy forged flanges, oxygen-free copper products, and railway ground cables. Our production capacity exceeds 30,000 tons of copper products annually, serving a wide array of industries including seawater desalination, nuclear power, petrochemical, marine, steam turbines, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit.
And we proudly authored the National Standard for copper alloy seamless tubes/pipes dedicated to Nuclear Power!
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