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: This extraordinary alloy boasts a tensile strength ranging from 620-900 MPa and an impressive yield strength of 450-750 MPa, adapting beautifully depending on the temper.
High Conductivity: With an electrical conductivity rating of 25-34 MS/m, equating to 45-60% IACS, this alloy significantly surpasses the conductivity standards of traditional bronze or brass.
Stress Relaxation Resistance: Outstanding in maintaining over 70% of its residual stress even when exposed to temperatures of 200°C.
Formability: Exhibits excellent cold workability, allowing for a minimum bending radius of just 2× the thickness, facilitating remarkable forming capabilities.
Eco-Certified: Proudly lead-free and fully compliant with RoHS & ELV standards, making it an environmentally responsible choice.
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 operations with a minimal bend radius of 2× thickness.
- Welding: Recommended welding techniques include TIG and MIG for superior results, while soft soldering ensures good performance.
- Heat Treatment:
- Soft Annealing: Perform at 600-700°C for 1-3 hours to achieve optimal softness.
- Hot Working: Conducted efficiently within 800-950°C, ensuring adaptability across various applications.
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: This alloy is certified under ASTM B888, RoHS, and ELV standards, with Mill Certificates readily available for compliance assurance.
- Testing Reports: Comprehensive reports cover mechanical properties, electrical conductivity, and metallurgical analysis, highlighting the alloy's quality.
- Customization: Offers non-standard sizes and specialized surface treatments including tin or silver plating to meet your specific needs.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd.) operates under the esteemed Huahong Group (A-STOCK: 002645.SZ), a renowned manufacturer of copper alloy products in eastern China, strategically located near Shanghai.
We are specializing at the production of copper and copper alloy (admiralty brass/naval brass, aluminum brass, 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, achieving an impressive annual production capacity exceeding 30,000 tons. These products are indispensable across industries such as seawater desalination, nuclear power, petrochemical, marine, steam turbine, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit.
And proudly co-authored the National Standard for copper alloy seamless tubes/pipes tailored for Nuclear Powerprojects!
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