Exquisite Product Overview for the CuNi3Si1Mg (C70250) Alloy
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
Exceptional High Strength: Exhibits a robust tensile strength ranging from 620 to 900 MPa and yield strength between 450 to 750 MPa, contingent on temper-a testament to its superior performance.
Outstanding High Conductivity: Offers electrical conductivity in the range of 25-34 MS/m, translating to an impressive 45-60% IACS, remarkably surpassing conventional bronze and brass.
Remarkable Stress Relaxation Resistance: Capable of maintaining over 70% of its residual stress even at temperatures soaring up to 200°C, ensuring reliability under duress.
Superior Formability: Demonstrates excellent cold workability with a minimum bending radius as tight as 2× the thickness, facilitating versatile applications.
Environmentally Certified: Proudly lead-free and fully compliant with both RoHS and ELV directives, underscoring our commitment to sustainability.
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
- Comprehensive Cold Working: Perfectly suited for intricate stamping and bending operations, maintaining a minimum bend radius of 2× thickness, ensuring precision.
- Efficient Welding: Utilizes recommended TIG/MIG methods (rated excellent) and soft soldering (rated good) for seamless joins.
- Optimal Heat Treatment:
- Soft Annealing: Conducted at a temperature range of 600-700°C for a duration of 1-3 hours, optimizing material properties.
- Hot Working: Best performed between the temperatures of 800-950°C, suitable for various industries.
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
- Robust Certifications: Complies with ASTM B888, RoHS, ELV standards; detailed Mill Certificates are readily available to ensure quality assurance.
- Comprehensive Testing Reports: Extensive reports on mechanical properties, conductivity, and metallurgical analysis affirm product reliability.
- Bespoke Customization: Offers non-standard sizes and surface treatments, including tin and silver plating, to meet specific project needs.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER / Jiangyin New Huahong Copper Industry Co., Ltd.) stands as a distinguished Branch of the renowned Huahong Group (A-STOCK: 002645.SZ). Situated in Eastern China near Shanghai, we are a celebrated manufacturer of superior copper alloy products.
Our Expertiselies in producing a diverse range of copper and copper alloy solutions, including but not limited to admiralty and naval brass, aluminum brass, cupronickel, and copper nickel products.Our portfolio encompasses condenser tubes, efficient 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 annually. Our products find applications across a wide array of industries such as seawater desalination, nuclear power, petrochemical, marine, steam turbines, pressure vessels, heat exchangers, central air conditioning, household appliances, and railway transit, among others.
Moreover, we have proudly contributed to the National Standard for copper alloy seamless tubes/pipes, particularly for Nuclear Power applications.
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