Discover the Outstanding Product Details for CuNi3Si1Mg (C70250), where innovation meets excellence.
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 an impressive tensile strength of 620-900 MPa and a yield strength of 450-750 MPa, varying by temper, this material is engineered for maximum performance.
High Conductivity: With electrical conductivity ranging from 25-34 MS/m or 45-60% IACS, it surpasses standard bronze and brass, making it an optimal choice for high-efficiency applications.
Stress Relaxation Resistance: Remarkably maintains over 70% residual stress even at elevated temperatures of 200°C, ensuring longevity and reliability.
Formability: Offers excellent cold workability with a minimum bending radius of only 2× thickness, providing versatility in shaping processes.
Eco-Certified: Lead-free and eco-friendly, fully compliant with RoHS and ELV standards, aligning with global sustainability goals.
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 minimum bend radius of 2× thickness, ensuring design flexibility.
- Welding: Optimal welding methods include TIG and MIG for excellent results, along with good soft soldering options.
- Heat Treatment:
- Soft Annealing: Achieve desired softness and ductility through annealing at 600-700°C for 1-3 hours.
- Hot Working: Efficient hot working processes can be conducted at 800-950°C for optimal material properties.
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 are readily available for assurance.
- Testing Reports: Comprehensive testing reports include mechanical properties, conductivity assessments, and detailed metallurgical analysis.
- Customization: Offers customization with non-standard sizes and specialized surface treatments such as tin and silver plating.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER / Jiangyin New Huahong Copper Industry Co., Ltd.) proudly operates as a pivotal branch of the renowned Huahong Group (A-STOCK: 002645.SZ), a leader in Copper Alloy product manufacturing situated in eastern China, conveniently close to Shanghai.
We specialize in the production of superior copper and copper alloy products such asadmiralty brass/naval brass, aluminum brass, and cupronickel/copper nickel) condenser tubes, efficient heat exchange tubes, large diameter copper nickel pipes, copper alloy forged flanges, oxygen-free copper products, and railway ground cables. Our annual production capacity exceeds 30,000 tons, with products extensively utilized in seawater desalination, nuclear power, petrochemical, marine, steam turbine, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit industries.
And we have proudly written the National Standard for copper alloy seamless tubes/pipes used in Nuclear Power! A testament to our technical prowess and commitment to quality.
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