Cupronickel Bars & Rods (90/10 & 70/30)| UNS C70600 / C71500
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Cupronickel Bars & Rods (90/10 & 70/30) | UNS C70600 / C71500 Brochure
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Descriptions
Navkar Metal Syndicate is a trusted exporter and stockist of Cupronickel Bars and Rods in 90/10 (C70600) and 70/30 (C71500) grades, available in Round, Flat, Square, and Hex profiles. Engineered for superior performance, our CuNi rods and bars are widely used across marine, power generation, desalination, and offshore industries.
These alloys are known for their outstanding resistance to seawater corrosion, erosion, and biofouling, ensuring long-term reliability in demanding environments. Each product is precision-manufactured, thoroughly inspected, and tested to international standards.
Our CuNi Bars & Rods offer excellent weldability, superior machinability, and consistent mechanical and physical properties. They are commonly used in pump shafts, condenser bolts, fasteners, flanges, valve parts, and offshore equipment, providing both structural integrity and ease of fabrication.
Every batch from Navkar Metal Syndicate comes with full Mill Test Certificates (MTCs), traceable heat numbers, export-grade packaging, and global logistics support — making us a dependable partner for turnkey Cupronickel supply solutions.
Chemical Composition
The chemical composition of Cupronickel Bars & Rods supplied by Navkar Metal Syndicate conforms to international standards such as ASTM B111 / B466 for UNS C70600 (90/10) and UNS C71500 (70/30). These alloys offer excellent resistance to seawater corrosion, stress cracking, and biofouling.
| Element | 90/10 CuNi (C70600) | 70/30 CuNi (C71500) |
|---|---|---|
| Copper (Cu) | 86.0 – 90.0 | 65.0 – 70.0 |
| Nickel (incl. Cobalt) | 9.0 – 11.0 | 29.0 – 33.0 |
| Iron (Fe) | 1.0 – 1.8 | 0.4 – 1.0 |
| Manganese (Mn) | 1.0 max | 1.0 max |
| Lead (Pb) | 0.02 max | 0.02 max |
| Zinc (Zn) | 0.5 max | 0.5 max |
| Others (each) | 0.05 max | 0.05 max |
| Balance | Copper | Copper |
Note: The composition values comply with ASTM, ASME, and relevant international specifications for marine-grade Copper Nickel Alloys.
Mechanical, Physical & Fabrication Properties
Navkar Metal Syndicate supplies premium Copper Nickel Pipes & Tubes in UNS C70600 (90/10) and UNS C71500 (70/30) compositions, conforming to ASTM B111 / ASME SB111 / B466 standards. These alloys are renowned for seawater corrosion resistance, strength, ductility, and excellent fabrication & welding characteristics—making them ideal for condensers, heat exchangers, and marine piping systems.
Mechanical Properties
| Property | 90/10 CuNi (C70600) | 70/30 CuNi (C71500) |
|---|---|---|
| Tensile Strength (UTS) | 300 – 520 MPa (44 – 75 ksi) | 370 – 520 MPa (54 – 75 ksi) |
| Yield Strength (0.2% Proof) | 100 – 400 MPa (15 – 58 ksi) | 120 – 380 MPa (17 – 55 ksi) |
| Elongation at Break | 10 – 42% | 10 – 45% |
| Hardness (Vickers HV) | 85 – 150 | 95 – 160 |
| Modulus of Elasticity | 130 – 140 GPa | 140 – 150 GPa |
| Compressive Strength | Similar to tensile strength (approx. 300–520 MPa) | Similar to tensile strength (approx. 370–520 MPa) |
| Shear Strength | ~200 MPa (typical) | ~240 MPa (typical) |
| Fatigue Strength (10⁷ cycles) | 105 MPa (15 ksi) | 125 MPa (18 ksi) |
| Impact Strength | High – maintains ductility at cryogenic temps | High – excellent toughness and resistance to shock |
| Work Hardening Rate | Moderate | Moderate to High |
| Weldability | Excellent (TIG, MIG, brazing, soldering) | Excellent (TIG, MIG, brazing, soldering) |
| Machinability Rating | 25 – 30% (compared to free-cutting brass = 100) | 20 – 25% (compared to free-cutting brass = 100) |
Physical Properties
| Property | 90/10 CuNi (C70600) | 70/30 CuNi (C71500) |
|---|---|---|
| Density | 8.89 g/cm³ | 8.95 g/cm³ |
| Melting Point (Solidus–Liquidus) | 1100 – 1130 °C | 1170 – 1240 °C |
| Thermal Conductivity | 50 – 60 W/m·K | 29 – 40 W/m·K |
| Electrical Conductivity | 10 – 12 % IACS | 6 – 8 % IACS |
| Specific Heat Capacity | 377 J/kg·K | 390 J/kg·K |
| Coefficient of Thermal Expansion (20 – 300 °C) | 17.1 × 10⁻⁶ /°C | 16.6 × 10⁻⁶ /°C |
| Elastic Modulus (Tension) | 130 – 140 GPa | 140 – 150 GPa |
| Poisson’s Ratio | 0.34 | 0.34 |
| Magnetic Permeability (annealed) | < 1.02 μr | < 1.03 μr |
| Corrosion Resistance | Excellent – outstanding in seawater and brine | Exceptional – high erosion & impingement resistance |
| Color / Appearance | Reddish-brown metallic finish | Silver-grey metallic finish |
Fabrication Properties
| Property | Cu-Ni 90/10 (UNS C70600) | Cu-Ni 70/30 (UNS C71500) |
|---|---|---|
| Forming Characteristics | Excellent – easily cold worked and formed | Good – requires slightly higher forming forces |
| Hot Working Temperature Range | 760 – 870 °C | 850 – 950 °C |
| Cold Working | Good – can be drawn, spun, or bent | Moderate – work hardens faster than 90/10 |
| Annealing Temperature Range | 650 – 850 °C (air cool) | 700 – 900 °C (air cool) |
| Stress Relief Temperature | 250 – 300 °C | 250 – 350 °C |
| Machinability Rating | 25 – 30% (vs. Free-Cutting Brass = 100) | 20 – 25% (vs. Free-Cutting Brass = 100) |
| Weldability | Excellent – GTAW (TIG), GMAW (MIG), SMAW, brazing | Excellent – all conventional welding methods |
| Brazing & Soldering | Excellent – with silver or phosphor-bronze filler metals | Excellent – high strength joints possible |
| Oxy-Acetylene Welding | Good – recommended for thin sections | Fair – prefer TIG or MIG for precision work |
| Forging | Good – forge at 760–870 °C | Good – forge at 850–950 °C |
| Heat Treatment | Annealing only; not hardenable by heat treatment | Annealing only; not hardenable by heat treatment |
| Polishability / Surface Finish | Excellent – smooth, corrosion-resistant finish | Excellent – bright silver-grey finish when polished |
| Corrosion Resistance | Outstanding in seawater and brine; anti-fouling surface | Exceptional under high-velocity seawater and erosion |
Applications
Cupronickel 90/10 (C70600) and 70/30 (C71500) bars and rods from Navkar Metal Syndicate are engineered for superior corrosion resistance, mechanical strength, and durability in aggressive marine and industrial environments. These alloys are widely used in both onshore and offshore systems where long-term reliability and ease of fabrication are critical.
- Marine Shafts, Bolts, and Fasteners – High-strength and corrosion-resistant components for shipboard use
- Shipbuilding and Offshore Platforms – Structural and mechanical fittings exposed to seawater and brine
- Pump Shafts and Seawater Fittings – Ideal for pumps, strainers, and seawater intake systems
- Power Generation & Desalination Plants – Used in cooling water systems, condensers, and evaporators
- Condenser Bolts, Flanges, and Valve Components – Precision-machined parts with high dimensional stability
- Chemical and Petrochemical Processing – Resistant to corrosion in acidic and chloride-bearing solutions
These applications demonstrate why Cu-Ni alloys remain the material of choice for engineers and fabricators worldwide seeking low-maintenance, long-service-life solutions in marine and industrial environments.
Standards & International Equivalents:
Cupronickel Bars and Rods are manufactured and supplied by Navkar Metal Syndicate in compliance with global material standards and specifications for marine, power, and industrial applications. The following table lists the international equivalents for both 90/10 (C70600) and 70/30 (C71500) alloys:
| Standard / Specification | Cu-Ni 90/10 (UNS C70600) | Cu-Ni 70/30 (UNS C71500) |
|---|---|---|
| UNS (Unified Numbering System) | C70600 | C71500 |
| ASTM (American Society for Testing and Materials) | ASTM B151, ASTM B111, ASTM B122 | ASTM B151, ASTM B111, ASTM B122 |
| EN / European Standard | EN 12163 / CW352H | EN 12163 / CW354H |
| DIN (German Standard) | DIN 2.0872 | DIN 2.0882 |
| BS (British Standard) | BS CN102, DEF STAN 02-879 Part 1 | BS CN107, DEF STAN 02-879 Part 2 |
| ISO (International Organization for Standardization) | ISO 1639 CuNi10Fe1Mn | ISO 1639 CuNi30Mn1Fe |
| JIS (Japanese Industrial Standard) | JIS H3300 C7060T | JIS H3300 C7150T |
| Military / Naval Standards | MIL-T-15005, MIL-C-15726, DEF STAN 02-779 | MIL-T-15005, DEF STAN 02-780 |
| Indian Standard (IS) | IS 4401 Cu-Ni 90/10 Rods, Bars & Tubes | IS 4401 Cu-Ni 70/30 Rods, Bars & Tubes |
| Equivalent Chemical Designation | CuNi10Fe1Mn | CuNi30Mn1Fe |
These international standards ensure consistent quality, mechanical integrity, and corrosion resistance across various industries such as marine engineering, power generation, desalination, and offshore oil & gas.
Common Names & International Identifiers
Cupronickel 90/10 (C70600) and 70/30 (C71500) bars and rods supplied by Navkar Metal Syndicate are globally recognized under various trade names and material designations. These identifiers ensure compatibility with international engineering standards and procurement systems.
| Category | Cu-Ni 90/10 (UNS C70600) | Cu-Ni 70/30 (UNS C71500) |
|---|---|---|
| Common Names | 90/10 Cupronickel, Copper-Nickel 90-10, CuNi10Fe1Mn | 70/30 Cupronickel, Copper-Nickel 70-30, CuNi30Mn1Fe |
| CDA (Copper Development Association) Alloy No. | 706 | 715 |
| UNS Designation | C70600 | C71500 |
| EN / European Identifier | CW352H | CW354H |
| BS (British Standard) | CN102 | CN107 |
| DIN (German Standard) | 2.0872 | 2.0882 |
| ISO Designation | CuNi10Fe1Mn | CuNi30Mn1Fe |
| JIS (Japanese Industrial Standard) | C7060T | C7150T |
| Other Trade Names | 90/10 Cupro Nickel, Admiralty 706, CuNi 90-10 Marine Alloy | 70/30 Cupro Nickel, Admiralty 715, CuNi 70-30 Marine Alloy |
These alloys are interchangeably referred to by different names in marine, power, and offshore industries, but all denote high-quality Cupronickel alloys known for their excellent seawater corrosion resistance, durability, and weldability.
Common Product Forms & Dimensions
Copper Nickel Flat Bar Size Chart (90/10 & 70/30)
Navkar Metal Syndicate offers a wide range of Cupronickel Flat Bars in both 90/10 (C70600) and 70/30 (C71500) grades, engineered for high corrosion resistance, excellent machinability, and strength in marine and industrial environments. Below is a detailed metric size and weight chart for standard flat bar sections.
| Flat Size (mm) | Weight (Kg/m) | Standard Length (m) | Colour Code |
|---|---|---|---|
| 10 x 3 | 0.24 | 6.0 | Blue |
| 13 x 3 | 0.31 | 6.0 | Blue |
| 13 x 5 | 0.46 | 6.0 | Orange |
| 16 x 3 | 0.38 | 6.0 | Blue |
| 16 x 5 | 0.64 | 6.0 | Orange |
| 16 x 8 | 1.03 | 6.0 | Red |
| 20 x 3 | 0.48 | 6.0 | Blue |
| 20 x 5 | 0.81 | 6.0 | Orange |
| 20 x 6 | 0.97 | 6.0 | White |
| 20 x 10 | 1.61 | 6.0 | Yellow |
| 25 x 3 | 0.60 | 6.0 | Blue |
| 25 x 5 | 1.01 | 6.0 | Orange |
| 25 x 8 | 1.61 | 6.0 | Red |
| 25 x 10 | 2.01 | 6.0 | Yellow |
| 32 x 10 | 2.58 | 6.0 | Yellow |
| 40 x 10 | 3.22 | 6.0 | Yellow |
| 50 x 10 | 4.02 | 6.0 | Yellow |
| 65 x 10 | 5.23 | 6.0 | Yellow |
| 75 x 10 | 6.04 | 6.0 | Yellow |
| 100 x 10 | 8.05 | 6.0 | Yellow |
| 150 x 10 | 12.1 | 6.0 | Yellow |
| 200 x 10 | 16.1 | 6.0 | Yellow |
| 250 x 10 | 20.1 | 6.0 | Yellow |
| 300 x 10 | 24.1 | 6.0 | Yellow |
All CuNi flat bars are available in custom cut lengths and polished finishes upon request. Contact Navkar Metal Syndicate for export packaging, test certificates, and dimensional tolerances as per ASTM B151 / EN 12163.
Copper Nickel Round Bar Size Chart (90/10 & 70/30)
Our Cupronickel Round Bars are available in both metric and imperial sizes, manufactured under stringent quality standards to meet marine, desalination, and power sector requirements. Available in various tolerance grades and finishes.
| Type | Size Range (mm) | Size Range (inches) | ISO Tolerance |
|---|---|---|---|
| Cold Drawn & Polished | 3.00 – 75.00 | 1/8″ – 3.00″ | h8 – h11 |
| Cold Drawn & Ground | 10.00 – 75.00 | 5/6″ – 2.50″ | h8 – h11 |
| Peeled & Polished | 40.00 – 150.00 | 1.50″ – 6.00″ | h11 (DIN 1013) |
| Peeled & Ground | 20.00 – 50.00 | 3/4″ – 2.00″ | h9 – h11 |
Standard supply lengths are typically 3m to 6m, with custom cut-to-length and precision ground options available for export projects. Each bar is supplied with Mill Test Certificates (EN 10204/3.1) and traceable heat numbers.
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