Premium Copper Nickel 70/30 Fasteners by Ratnadeep Steel & Engg. Co.
Ratnadeep Steel & Engg. Co. is a trusted manufacturer, exporter, and supplier of premium-quality Copper Nickel 70/30 Fasteners. Produced from high-grade copper-nickel alloy using advanced manufacturing techniques, our fasteners provide excellent resistance to seawater corrosion, high strength, and long-term reliability for marine and offshore applications.
Copper Nickel 70/30 fasteners are renowned for their outstanding resistance to seawater corrosion, biofouling, erosion corrosion, and stress corrosion cracking. With a higher nickel content, this alloy offers superior mechanical strength and corrosion resistance compared to Cu-Ni 90/10, making it ideal for severe marine, offshore, and naval environments operating under high flow and pressure conditions.
Manufactured with precise threading, smooth surface finish, and strict dimensional control, our Copper Nickel 70/30 fasteners deliver dependable performance under continuous seawater exposure, vibration, and thermal variations. These fasteners are widely used in shipbuilding, offshore oil & gas platforms, desalination plants, heat exchangers, condensers, and seawater piping systems.
Our Range of Copper Nickel Alloy 70/30 Industrial Fasteners
- Cu-Ni 70/30 Hex, Heavy Hex & Lock Nuts
- UNS C71500 Copper Nickel Precision Machined Nuts
- DIN & ASTM B151 compliant nut configurations
- Excellent resistance to seawater and marine corrosion
- ASTM B151 Copper Nickel 70/30 Bolting
- Hex Bolts, Heavy Hex & Structural Bolts
- UNS C71500 for marine & offshore use
- High resistance to erosion and biofouling
- Cu-Ni 70/30 Socket Head & Hex Head Screws
- Set Screws, Cap Screws & Custom Fasteners
- ASTM B151 / DIN standard manufacturing
- Ideal for continuous seawater exposure
- Cu-Ni 70/30 Plain, Spring & Dock Washers
- Split, Ogee & Custom Washer Profiles
- Ensures uniform load distribution
- Marine-grade corrosion resistance
- ASTM B151 Copper Nickel 70/30 Stud Bolts
- Single Ended, Double Ended & Fully Threaded
- UNS C71500 for flange applications
- Used in offshore and desalination systems
- Cu-Ni 70/30 Fully Threaded & Cut-Length Rods
- ASTM B151 / UNS C71500 Compliance
- Excellent resistance to seawater corrosion
- Ideal for marine and structural assemblies
COPPER NICKEL 70/30 ASTM B151 FASTENERS EQUIVALENT GRADES
| Standard | UNS | WNR. |
|---|---|---|
| Copper Nickel 70/30 | C71500 | 2.0882 |
SPECIFICATION OF COPPER NICKEL 70/30 FASTENERS
| Specification | ASTM B151 / ASME SB151 |
|---|---|
| Dimension Standards | DIN, ISO, ASTM, JIS, BS, GB, IS and all International Standards |
| Size Range | M3 – M56 | 3/6" to 2" | Custom Sizes |
| Length | 3 mm to 200 mm |
| Types | Nuts, Bolts, Screws, Sockets, Studs, Hex Set Screws, Socket Screws, Cap Screws, Pan Head Screws, Machine Screws, Socket Head Cap Screws, Allen Cap Screws, Wing Screws, Washers, Spring Washers, Anchors, Marine Anchors, Hexagon Nuts, Hex Nuts, Coupling Nuts, Hex Domed Cap Nuts, Square Nuts, Stud Bolts, Hex Head Bolts, Socket Hexagon Head Screw Anchor Bolts, U-Bolts, J-Bolts, Mushroom Head Square Neck Bolts, T-Head Bolts, Eye Bolts, Foundation Bolts, Structural Bolts |
CHEMICAL COMPOSITION OF COPPER NICKEL 70/30 INDUSTRIAL FASTENERS
| Grade | Cu | Mn | Pb | Ni | Fe | Zn |
|---|---|---|---|---|---|---|
| Cu-Ni 70/30 | 65.0 min | 1.0 max | 0.05 max | 29 – 33 | 0.4 – 1.0 | 1.0 max |
MECHANICAL PROPERTIES OF ASME SB151 COPPER NICKEL 70/30 BOLTS & NUTS
| Properties | Metric | Imperial |
|---|---|---|
| Tensile Strength, Ultimate | 372 – 517 MPa | 54,000 – 75,000 psi |
| Tensile Strength, Yield (Temp. Dependent) | 88 – 483 MPa | 12,800 – 70,100 psi |
| Elongation at Break (in 381 mm) | 45% | 45% |
| Charpy Impact | 107 J | 78.9 ft-lb |
| Machinability (UNS C36000 = 100%) | 20% | 20% |
| Shear Modulus | 57.0 GPa | 8,270 ksi |
| Poisson’s Ratio | 0.34 | 0.34 |
| Elastic Modulus | 150 GPa | 21,800 ksi |
PHYSICAL PROPERTIES OF COPPER NICKEL 70/30 FASTENERS
| Property | Metric | Imperial |
|---|---|---|
| Density | 8.94 g/cm³ | 0.323 lb/in³ |
| Melting Point | 1171 °C | 2140 °F |
💡 Practical Difference in Use
Use Copper Nickel 70/30 Fasteners when: exceptional resistance to seawater corrosion, biofouling, and erosion is required under high-velocity or turbulent marine conditions. → Example: offshore platforms, ship hulls, seawater piping, heat exchangers, and condensers.
Applications of Copper Nickel 70/30 Fasteners
Copper Nickel 70/30 fasteners (UNS C71500) offer superior resistance to seawater corrosion, erosion-corrosion, and marine biofouling. With higher nickel content than 90/10, these fasteners provide enhanced strength and durability for severe marine and offshore environments.
- Marine Engineering: Seawater piping systems, pumps, and valves.
- Offshore Structures: Platforms, risers, and subsea components.
- Heat Exchangers: Condensers and coolers using seawater.
When to Choose Copper Nickel 70/30 Fasteners?
Copper Nickel 70/30 fasteners are selected for applications requiring maximum resistance to seawater corrosion combined with higher mechanical strength.
Choose Copper Nickel 70/30 Fasteners when:
- Severe seawater or high-velocity flow conditions are present
- Excellent resistance to erosion and cavitation is required
- High resistance to marine biofouling is critical
- Long service life in offshore environments is essential
- Higher strength than Cu-Ni 90/10 is needed
Industries That Use Copper Nickel 70/30 Fasteners
Copper Nickel 70/30 fasteners are widely used in industries exposed to harsh marine and seawater environments.
Designed for constant seawater exposure.
Uses
Hull fittings, seawater piping, and propeller systems.
Why Copper Nickel 70/30?
Outstanding resistance to seawater corrosion and biofouling.
Performs reliably in aggressive offshore conditions.
Uses
Subsea pipelines, risers, and platform equipment.
Why Copper Nickel 70/30?
Excellent erosion-corrosion resistance under high flow.
Ideal for seawater cooling systems.
Uses
Condensers, heat exchangers, and cooling circuits.
Why Copper Nickel 70/30?
Long service life with minimal maintenance.
Usage Guide for Copper Nickel 70/30 Fasteners
Copper Nickel 70/30 nuts provide exceptional corrosion resistance and strength in severe marine and offshore environments.
Choose Copper Nickel 70/30 Nuts when
- Fasteners are exposed to continuous seawater or splash zones
- High resistance to erosion and biofouling is required
- Used in offshore platforms or marine piping systems
- Long service life in aggressive marine conditions is critical
Copper Nickel 70/30 bolts offer excellent resistance to seawater corrosion under high-flow conditions.
Choose Copper Nickel 70/30 Bolts when
- High-velocity seawater or turbulent flow is involved
- Used in offshore oil & gas and marine structures
- Resistance to erosion-corrosion is essential
- Reliable performance in extreme marine environments is required
Copper Nickel 70/30 screws ensure secure fastening in corrosive seawater systems.
Choose Copper Nickel 70/30 Screws when
- Marine corrosion resistance is more important than high tensile strength
- Used in shipbuilding and offshore equipment
- Exposure to saltwater and humid marine air is expected
- Low maintenance and long-term reliability are required
Copper Nickel 70/30 washers distribute load effectively while resisting seawater corrosion.
Choose Copper Nickel 70/30 Washers when
- Used in seawater piping and marine flange assemblies
- Protection against galvanic corrosion is important
- High resistance to crevice corrosion is required
- Long-term joint stability in marine service is critical
Copper Nickel 70/30 stud bolts are ideal for high-flow seawater and offshore flange connections.
Choose Copper Nickel 70/30 Stud Bolts when
- Used in offshore platforms and subsea piping
- Exposure to turbulent seawater conditions exists
- Erosion-corrosion resistance is critical
- Long service life with minimal maintenance is required
Copper Nickel 70/30 threaded rods provide reliable fastening in harsh marine environments.
Choose Copper Nickel 70/30 Threaded Rods when
- Custom-length fastening is required for marine installations
- Used in seawater cooling and offshore structural systems
- High resistance to marine corrosion is essential
- Durability in extreme seawater exposure is required
Our Industrial Fasteners are manufactured using precision forging and machining processes to ensure excellent dimensional accuracy, strength, and long-term performance. Each fastener undergoes strict quality inspections, including visual and dimensional checks, tensile testing, hardness testing, and thread gauging to verify compliance with specified tolerances.
Comprehensive chemical composition analysis and mechanical property testing are carried out to confirm material integrity and standard conformity. Where required, additional NDT methods such as ultrasonic testing, magnetic particle inspection (MPI), or dye penetrant testing (DPT) are performed to detect surface or internal defects. Controlled forging, heat treatment, and threading processes eliminate issues such as cracks, laps, and thread imperfections.
All fasteners are manufactured and tested in accordance with international standards including ASTM, ASME, ISO, DIN, BS, and IS specifications. Engineered for reliable performance in high-pressure, high-temperature, and corrosive environments, our fasteners are widely used across oil & gas, petrochemical, power generation, construction, and heavy engineering industries.
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