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: Boasting impressive tensile strength ranging from 620 to 900 MPa and yield strength of 450 to 750 MPa, varying by temper, this copper alloy is designed to withstand rigorous demands.
High Conductivity: With electrical conductivity between 25-34 MS/m, equating to 45-60% IACS, this alloy surpasses the standard bronze and brass, ensuring superior performance in demanding electrical applications.
Stress Relaxation Resistance: Remarkably maintains over 70% of residual stress even at elevated temperatures of 200°C, delivering reliable performance under thermal stress.
Formability: Offers excellent cold workability with a minimal bending radius of just 2× thickness, allowing for versatile shaping and forming capabilities.
Eco-Certified: Completely lead-free and in compliance with RoHS & ELV standards, this alloy supports environmentally responsible manufacturing.
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: Exceptionally suited for stamping and bending, this material has a minimum bend radius requirement of 2× thickness, ensuring flexibility in production processes.
- Welding: Offers excellent compatibility with TIG/MIG welding methods, while also being suitable for good quality soft soldering, enhancing manufacturing versatility.
- Heat Treatment:
- Soft Annealing: Conducted at 600-700°C for 1-3 hours to achieve optimal material softness.
- Hot Working: Performed at temperatures ranging from 800-950°C, facilitating effective shaping and forming.
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 certifications, with Mill Certificates readily available to verify compliance and quality assurance.
- Testing Reports: Comprehensive testing including mechanical properties, conductivity, and metallurgical analysis ensures reliability and standard adherence.
- Customization: Offers flexibility with non-standard sizes and specialized surface treatments such as tin or silver plating to meet unique customer needs.
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), a leading manufacturer of copper alloy products located in the vibrant industrial hub near Shanghai, eastern China.
Specializing in the production of copper and copper alloy products such asadmiralty brass, naval brass, aluminum brass, cupronickel, and copper nickelcondenser tubes, effective heat exchange tubes, large diameter copper nickel pipes, copper alloy forged flanges, oxygen-free copper products, and railway ground cables. Our extensive production capacity exceeds 30,000 tons annually, serving diverse industries including seawater desalination, nuclear power, petrochemical, marine, steam turbines, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit.
Additionally, our team has proudly contributed to the development of the National Standard for copper alloy seamless tubes and pipes employed in Nuclear Powerapplications, setting benchmarks for quality and safety!
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