Copper Pipes, Tubes, Coils & Fittings
Explore
Copper Nickel Nuts & Bolts (Cu-Ni 90/10 & 70/30)
Product Overview
Copper Nickel Nuts & Bolts manufactured in Cu-Ni 90/10 and Cu-Ni 70/30 alloys are engineered for high-performance fastening in corrosive and marine environments where conventional fasteners fail. These alloys offer exceptional resistance to seawater corrosion, biofouling, stress corrosion cracking, and chloride attack, making them ideal for offshore, shipbuilding, desalination, heat exchanger, and chemical processing applications. With excellent mechanical strength, thermal stability, and long-term durability, Copper Nickel fasteners maintain structural integrity under fluctuating temperatures and continuous exposure to harsh fluids. R V Metal Corporation supplies precision-manufactured Copper Nickel nuts, bolts, studs, washers, and custom fasteners conforming to international standards, ensuring reliability, dimensional accuracy, and extended service life in critical engineering systems.
Technical Specifications
| Parameter | Cu-Ni 90/10 Nuts & Bolts | Cu-Ni 70/30 Nuts & Bolts |
|---|---|---|
| Alloy Designation | Copper Nickel 90/10 | Copper Nickel 70/30 |
| UNS Number | C70600 / C70620 | C71500 / C71520 |
| Nickel Content | 9.0 – 11.0 % | 29.0 – 33.0 % |
| Iron Content | 1.0 – 2.0 % | 0.4 – 1.0 % |
| Manganese Content | 0.5 – 1.0 % | 0.5 – 1.0 % |
| Manufacturing Process | Hot Forged / Machined | Hot Forged / Machined |
| Fastener Types | Hex Bolts, Stud Bolts, Nuts, Washers | Hex Bolts, Stud Bolts, Nuts, Washers |
| Thread Standards | Metric, UNC, UNF, BSW, BSF | Metric, UNC, UNF, BSW, BSF |
| Size Range | M6 to M64 (¼” to 2½”) | M6 to M64 (¼” to 2½”) |
| Length Range | Up to 1000 mm | Up to 1000 mm |
| Tensile Strength (Typical) | 360 – 450 MPa | 450 – 550 MPa |
| Yield Strength (Typical) | 120 – 170 MPa | 150 – 220 MPa |
| Hardness | 90 – 120 HB | 110 – 150 HB |
| Operating Temperature | -200°C to +300°C | -200°C to +350°C |
| Corrosion Resistance | Excellent (Seawater & Chloride) | Superior (High Velocity Seawater) |
| Magnetic Properties | Non-Magnetic | Non-Magnetic |
| Surface Finish | Natural, Pickled, Machined Finish | Natural, Pickled, Machined Finish |
| Standards Compliance | ASTM, ASME, DIN, EN, BS, IS | ASTM, ASME, DIN, EN, BS, IS |
| Typical Applications | Marine, Offshore, Heat Exchangers | Naval, Desalination, High-Pressure Systems |
Chemical Composition
| Element | Cu-Ni 90/10 Nuts & Bolts (UNS C70600 / C70620) |
Cu-Ni 70/30 Nuts & Bolts (UNS C71500 / C71520) |
|---|---|---|
| Copper (Cu) | Balance (≈ 86.0 – 89.0 %) | Balance (≈ 63.0 – 67.0 %) |
| Nickel (Ni) | 9.0 – 11.0 % | 29.0 – 33.0 % |
| Iron (Fe) | 1.0 – 2.0 % | 0.4 – 1.0 % |
| Manganese (Mn) | 0.5 – 1.0 % | 0.5 – 1.0 % |
| Zinc (Zn) | Max 0.5 % | Max 0.5 % |
| Carbon (C) | Max 0.05 % | Max 0.05 % |
| Silicon (Si) | Max 0.15 % | Max 0.15 % |
| Sulphur (S) | Max 0.02 % | Max 0.02 % |
| Phosphorus (P) | Max 0.02 % | Max 0.02 % |
| Lead (Pb) | Max 0.02 % | Max 0.02 % |
| Total Other Elements | Max 0.5 % | Max 0.5 % |
UNS Codes & Grades
| Alloy Type | UNS Code | ASTM Designation | EN / DIN Equivalent | ISO Designation | Product Form (Nuts & Bolts) | Typical Application Severity |
|---|---|---|---|---|---|---|
| Copper Nickel 90/10 | C70600 | ASTM B151 / B151M | EN CW352H | ISO CuNi10Fe1Mn | Machined / Forged Fasteners | Marine, Seawater Piping, Heat Exchangers |
| Copper Nickel 90/10 (Forging Grade) | C70620 | ASTM B164 | EN CW353H | ISO CuNi10Fe1Mn | Hot Forged Bolts & Nuts | Offshore, Shipbuilding, Condensers |
| Copper Nickel 70/30 | C71500 | ASTM B151 / B151M | EN CW354H | ISO CuNi30Mn1Fe | Machined / Forged Fasteners | High-Velocity Seawater, Naval Systems |
| Copper Nickel 70/30 (Forging Grade) | C71520 | ASTM B164 | EN CW355H | ISO CuNi30Mn1Fe | Hot Forged Bolts & Nuts | Critical Offshore & Defense Applications |
Mechanical, Physical & Fabrication Properties
| Property | Cu-Ni 90/10 (C70600 / C70620) | Cu-Ni 70/30 (C71500 / C71520) |
|---|---|---|
| Ultimate Tensile Strength (MPa) | 300 – 360 | 360 – 450 |
| Yield Strength (0.2% Proof, MPa) | 120 – 160 | 150 – 200 |
| Elongation (%) | 30 – 45 | 25 – 35 |
| Hardness (HB) | 80 – 110 | 100 – 140 |
| Density (g/cm³) | 8.9 | 8.95 |
| Modulus of Elasticity (GPa) | 150 – 160 | 155 – 165 |
| Thermal Conductivity (W/m·K) | 50 – 60 | 35 – 45 |
| Electrical Conductivity (% IACS) | 15 – 20 | 8 – 12 |
| Corrosion Resistance | Excellent in seawater, moderate velocity | Outstanding in high-velocity & polluted seawater |
| Erosion–Corrosion Resistance | Good | Excellent |
| Stress Corrosion Cracking Resistance | Excellent | Excellent |
| Machinability | Moderate (better than 70/30) | Moderate to Difficult |
| Forgeability | Very Good (preferred for hot-forged fasteners) | Good (higher forging loads required) |
| Cold Workability | Good | Fair |
| Weldability | Excellent (TIG / MIG / SMAW) | Excellent (controlled heat input required) |
| Typical Fastener Forms | Hex Bolts, Studs, Nuts, Washers | Heavy Studs, Structural Bolts, Marine Fasteners |
| Recommended Service Temperature (°C) | -50 to 300 | -50 to 350 |
Common Names & International Identifiers
| Material / Common Name | UNS Designation | ASTM / ASME Identifier | EN / DIN Equivalent | ISO / BS Equivalent | Typical Industry Reference | Fastener Application Context |
|---|---|---|---|---|---|---|
| Copper Nickel 90/10 Fasteners | C70600 / C70620 | ASTM B466 / B467 (rod & bar) | EN CW352H | BS 2874 CN102 | CuNi10Fe1Mn | Marine piping bolts, condenser flanges, seawater systems |
| Copper Nickel 70/30 Fasteners | C71500 / C71520 | ASTM B466 / B467 (rod & bar) | EN CW354H | BS 2874 CN107 | CuNi30Mn1Fe | Naval hardware, offshore platforms, high-velocity seawater lines |
| Marine Copper Nickel Bolting Alloy | C71500 | ASTM B164 / B165 (pipe reference) | EN CW354H | ISO 1634 | 70/30 Cu-Ni Marine Grade | Heavy-duty studs, structural marine fasteners |
| Naval Copper Nickel Fasteners | C70600 | ASTM B171 (plate reference) | EN CW352H | BS 2870 CN102 | 90/10 Cu-Ni Naval Grade | Shipboard fasteners, desalination plants |
| Seawater Resistant Copper Nickel Bolts | C70620 / C71520 | ASTM B466 (hot worked) | EN CW352H / CW354H | ISO Marine Alloys | Cu-Ni Fe-Mn Alloy | Flanged joints, pumps, valves, heat exchangers |
Standards & International Equivalents
| Product | Alloy / Grade | UNS No. | ASTM / ASME Standard | EN / DIN Equivalent | BS / ISO Equivalent | Common International Designation |
|---|---|---|---|---|---|---|
| Copper Nickel Nuts & Bolts | Cu-Ni 90/10 | C70600 / C70620 | ASTM B466 / B467 (Rod & Bar for Fasteners) | EN 12163 / EN 12164 – CW352H | BS 2874 CN102 / ISO CuNi10Fe1Mn | CuNi10Fe1Mn |
| Copper Nickel Nuts & Bolts | Cu-Ni 70/30 | C71500 / C71520 | ASTM B466 / B467 (Rod & Bar for Fasteners) | EN 12163 / EN 12164 – CW354H | BS 2874 CN107 / ISO CuNi30Mn1Fe | CuNi30Mn1Fe |
| Marine-Grade Cu-Ni Fasteners | 90/10 Marine | C70600 | ASTM B171 (Plate reference for forged fasteners) | EN CW352H | ISO 1634 | 90/10 Copper Nickel |
| Naval & Offshore Cu-Ni Fasteners | 70/30 Marine | C71500 | ASTM B164 / B165 (Pipe reference for matching systems) | EN CW354H | ISO 1634 | 70/30 Copper Nickel |
| Machined Cu-Ni Studs & Bolts | Hot-Worked Cu-Ni | C70620 / C71520 | ASTM B466 (Hot worked rod) | EN 12163 CW352H / CW354H | BS / ISO Marine Alloys | Cu-Ni Fe-Mn Alloy |
Applications
| Industry / System | Application Area | Why Copper Nickel is Used | Recommended Grade | Typical Fastener Types |
|---|---|---|---|---|
| Marine & Shipbuilding | Seawater piping, hull fittings, heat exchangers | Outstanding resistance to seawater corrosion, biofouling, and crevice attack | Cu-Ni 90/10, Cu-Ni 70/30 | Hex bolts, studs, nuts, washers |
| Offshore Oil & Gas | Seawater cooling systems, firewater lines | Stable mechanical properties in chloride-rich environments; long service life | Cu-Ni 70/30 | Stud bolts, heavy hex nuts |
| Desalination Plants | Brine circuits, intake/outfall piping | High resistance to erosion-corrosion and microbiologically influenced corrosion (MIC) | Cu-Ni 90/10 | Bolts, nuts, flanges fasteners |
| Power Plants | Condensers, heat exchangers, cooling water systems | Excellent thermal conductivity and corrosion resistance in cooling water | Cu-Ni 90/10 | Studs, bolts, nuts |
| Naval & Defense | Weapons systems, seawater service equipment | High reliability, non-magnetic behavior, superior marine durability | Cu-Ni 70/30 | Precision bolts, studs, nuts |
| Chemical & Process Industry | Salt handling units, chloride-bearing process lines | Resistance to chloride stress corrosion cracking | Cu-Ni 90/10, Cu-Ni 70/30 | Bolts, studs, anchor fasteners |
| HVAC & Industrial Cooling | Cooling towers, chilled water systems | Long-term corrosion resistance with minimal maintenance | Cu-Ni 90/10 | Hex bolts, nuts |
| Marine Infrastructure | Jetties, offshore platforms, coastal installations | Performs reliably in splash and tidal zones | Cu-Ni 70/30 | Heavy-duty studs, bolts, nuts |
| Ship Repair & Retrofits | Replacement fasteners for Cu-Ni systems | Prevents galvanic corrosion when used with Cu-Ni piping | Cu-Ni 90/10, Cu-Ni 70/30 | Custom bolts, studs, nuts |
| Heat Exchanger Manufacturing | Tube sheets, water boxes, channel covers | Material compatibility and uniform corrosion behavior | Cu-Ni 90/10 | Stud bolts, nuts |
Standard Copper Nickel Nuts & Bolts (Cu-Ni 90/10 & 70/30) Dimensional Chart
| Fastener Size | Thread Standard | Nominal Diameter (mm) | Thread Pitch (mm) | Hex Head / AF (mm) | Nut Height (mm) | Standard Bolt Lengths (mm) | Applicable Grades |
|---|---|---|---|---|---|---|---|
| M6 | ISO Metric Coarse | 6 | 1.0 | 10 | 5 | 20 – 60 | Cu-Ni 90/10, 70/30 |
| M8 | ISO Metric Coarse | 8 | 1.25 | 13 | 6.5 | 25 – 80 | Cu-Ni 90/10, 70/30 |
| M10 | ISO Metric Coarse | 10 | 1.5 | 17 | 8 | 30 – 100 | Cu-Ni 90/10, 70/30 |
| M12 | ISO Metric Coarse | 12 | 1.75 | 19 | 10 | 40 – 120 | Cu-Ni 90/10, 70/30 |
| M16 | ISO Metric Coarse | 16 | 2.0 | 24 | 13 | 50 – 160 | Cu-Ni 90/10, 70/30 |
| M20 | ISO Metric Coarse | 20 | 2.5 | 30 | 16 | 60 – 200 | Cu-Ni 90/10, 70/30 |
| M24 | ISO Metric Coarse | 24 | 3.0 | 36 | 19 | 80 – 250 | Cu-Ni 90/10, 70/30 |
| M30 | ISO Metric Coarse | 30 | 3.5 | 46 | 24 | 100 – 300 | Cu-Ni 90/10, 70/30 |
| Fastener Type | Standard | Nominal Size | Thread Type | Pitch (mm) | Across Flats / Head Size (mm) | Nut Height / Head Thickness (mm) | Standard Length Range (mm) | Applicable Alloy Grades |
|---|---|---|---|---|---|---|---|---|
| Hex Bolt | ISO 4014 / DIN 931 | M6 | Metric Coarse | 1.0 | 10 | 4 | 20 – 60 | Cu-Ni 90/10, 70/30 |
| Hex Nut | ISO 4032 / DIN 934 | M6 | Metric Coarse | 1.0 | 10 | 5 | — | Cu-Ni 90/10, 70/30 |
| Hex Bolt | ISO 4014 / DIN 931 | M10 | Metric Coarse | 1.5 | 17 | 6.4 | 30 – 100 | Cu-Ni 90/10, 70/30 |
| Hex Nut | ISO 4032 / DIN 934 | M10 | Metric Coarse | 1.5 | 17 | 8 | — | Cu-Ni 90/10, 70/30 |
| Stud Bolt (Fully Threaded) | DIN 975 / ASTM F467 | M12 | Metric Coarse | 1.75 | — | — | 50 – 200 | Cu-Ni 90/10, 70/30 |
| Heavy Hex Nut | ISO 4033 | M12 | Metric Coarse | 1.75 | 21 | 10 | — | Cu-Ni 90/10, 70/30 |
| Socket Head Cap Screw | ISO 4762 | M16 | Metric Coarse | 2.0 | — | 16 | 40 – 160 | Cu-Ni 90/10, 70/30 |
| Hex Bolt | ISO 4017 | M20 | Metric Coarse | 2.5 | 30 | 7.5 | 60 – 200 | Cu-Ni 90/10, 70/30 |
| Hex Nut | ISO 4032 | M20 | Metric Coarse | 2.5 | 30 | 16 | — | Cu-Ni 90/10, 70/30 |
| Stud Bolt (Flange Use) | ASTM F467 / DIN 976 | M24 | Metric Coarse | 3.0 | — | — | 80 – 300 | Cu-Ni 90/10, 70/30 |
| Heavy Hex Nut | ISO 4033 | M24 | Metric Coarse | 3.0 | 36 | 19 | — | Cu-Ni 90/10, 70/30 |
