An In-depth Exploration of CuNi3Si1Mg (C70250) Ultra High Pressure Piping Material
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: Offers an impressive tensile strength of 620-900 MPa and a yield strength of 450-750 MPa, adaptable based on temper.
Remarkable High Conductivity: Delivers superior electrical conductivity ranging from 25-34 MS/m (45-60% IACS), surpassing standard bronze and brass.
Outstanding Stress Relaxation Resistance: Capably maintains more than 70% of residual stress even at elevated temperatures of 200°C.
Superior Formability: Boasts excellent cold workability with a minimum bending radius of 2× the material's thickness.
Environmentally Friendly and Eco-Certified: Lead-free and fully compliant with RoHS and ELV directives, ensuring environmental responsibility.
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: Ideally suited for stamping and bending with a minimum bend radius of 2× thickness, ensuring versatility.
- Welding: Optimal welding methods include TIG/MIG (excellent results) and soft soldering (good outcomes).
- Heat Treatment:
- Soft Annealing: Conducted at 600-700°C for 1-3 hours to optimize material properties.
- Hot Working: Executed at temperatures ranging from 800-950°C for effective shaping.
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: Compliant with ASTM B888, RoHS, and ELV standards; Mill Certificates are available upon request.
- Testing Reports: Detailed reports on mechanical properties, conductivity, and metallurgical analysis are provided.
- Customization: Available in non-standard sizes and offers surface treatments such as tin and silver plating for tailored solutions.
Company Reference
Jiangyin Hehong Precision Technology (HHP COPPER /Jiangyin New Huahong Copper Industry Co., Ltd. ) is a prominent branch of the Huahong Group (A-STOCK : 002645.SZ), a renowned manufacturer of Copper Alloy products situated in eastern China, conveniently close to Shanghai.
We specialize in the production of superior copper and copper alloy products, including but not limited to:admiralty brass, naval brass, aluminum brass, cupronickel, and copper nickelcondenser tubes, efficient heat exchange tubes, large diameter copper nickel pipes, copper alloy forged flanges, oxygen-free copper products, and railway ground cables. Our robust annual production capacity exceeds 30,000 tons. Our products find versatile applications across seawater desalination, nuclear power, petrochemical, marine, steam turbine, pressure vessels, heat exchangers, central air-conditioning, household appliances, and railway transit sectors.
Moreover, we have been instrumental in drafting the National Standard for copper alloy seamless tubes and pipes utilized in Nuclear Powerindustries!
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