Cupro Nickel 70/30 Forgings

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Metracore Alloys produces Cupro Nickel 70/30 Forgings in the shapes marine engineers order most: rings, discs, shafts, flanges, bushings, sleeves, and valve or pump components. Open die capacity covers diameters from 50 mm up to 2,000 mm, and we also forge heavier custom pieces against client drawings.

Each piece starts as UNS C71500, the copper-nickel grade built on about 70% copper set against 30% nickel, with iron and manganese lifting its strength. Continuous seawater exposure is the duty this grade handles best. Forged 70/30 parts resist corrosion, erosion, and biofouling through years of immersion, which keeps the alloy on approved lists at naval yards, offshore platforms, desalination plants, and heat exchanger workshops.

Finished forgings move through our domestic and international distribution network, and consignments have a record of reaching fabrication yards and project sites on the committed date. Send a drawing or a bill of materials, and we’ll return a quotation with confirmed forging capacity.

Why Select Cupro Nickel 70/30 Forgings?

The case for forged 70/30 rests on what hot working adds to an already capable alloy. Nickel dissolves completely into the copper matrix at 30%, and the iron addition strengthens the oxide film that shields the metal in salt water. Forging refines the grain. Hot deformation closes internal voids, aligns flow lines with the part geometry, and produces mechanical properties that cast equivalents can’t reach.

Erosion and cavitation resistance follow from that dense structure; impeller hubs and valve trim survive flow conditions that pit softer copper alloys. Thermal stability counts in the grade’s favour too, since strength holds steady across condenser and exchanger operating temperatures. Marine operators budget decades of service for forged 70/30 components, not years.

Why Choose Metracore Alloys?

Copper-nickel forging is a specialisation at Metracore Alloys rather than one product among dozens. We forge, ring roll, and precision machine to customer drawings, holding the tolerances that finished component work demands. Quality assurance follows each order from billet allocation through final inspection, and third-party inspectors are welcome at any hold point. Every consignment ships with its EN 10204 3.1 Mill Test Certificate. Export packaging is standard, with crates sealed, braced, and stencilled for ocean freight before they leave the facility. Domestic and export orders both leave on the confirmed date. Send your drawing, grade, and quantity for a firm offer.

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Table of Content

Cupro Nickel 70/30 Forgings Specifications

Types of Cupro Nickel 70/30 Forgings

Reach out to Metracore Alloys for reliable Cupro Nickel 70/30 Forgings solutions.

Technical Details of Cupro Nickel 70/30 Forgings

Chemical Composition

Chemistry limits for the C71500 grade keep residual elements tightly capped, and every heat we forge lands inside the published ranges below.

Element	Composition (%)
Copper (Cu)	Remainder
Nickel (Ni)	29.0-33.0
Iron (Fe)	0.40-1.0
Manganese (Mn)	1.0 max
Carbon (C)	0.05 max
Lead (Pb)	0.05 max
Zinc (Zn)	1.0 max

Mechanical & Physical Properties

Annealed forgings meet the figures below across the full size range; test bars cut from each heat prove it.

Property	Value
Tensile Strength	360 MPa min (52 ksi)
Yield Strength	125 MPa min (18 ksi)
Elongation	45% (typical)
Hardness	45 HRB approx.
Density	8.94 g/cm³
Thermal Conductivity	29 W/m·K at 20°C

Performance Characteristics

Performance in service separates 70/30 from standard marine alloys. Seawater corrosion rates stay negligible because the nickel-iron oxide film repairs itself wherever flow disturbs it. Impingement attack at nozzles and bends progresses slowly. Flow at 4.5 m/s causes no erosion damage. Strength doesn’t fade either: Copper Nickel 70/30 Forgings retain their 360 MPa tensile minimum through normal exchanger temperatures.

Biofouling control comes built in. Ions shed by the copper surface stop marine organisms from settling. Fabricators rate the alloy highly too: it machines predictably, and welds made with matching filler need no heat treatment afterwards. Offshore operators get components that run through storm loading, splash zone exposure, and continuous immersion without unplanned intervention.

Inspection & Compliance Standards

Compliance starts with the material standards: ASTM B151 for forged rod and bar stock, ASTM B171 for tubesheet plate, while ASTM B466 and B122 cover allied product forms on combined orders. Certification follows EN 10204 3.1, with chemistry and mechanical results traceable to the heat. Six checks screen every forging before release. Chemical analysis comes first and confirms the composition remains within the C71500 window. Ultrasonic testing scans thick sections for internal discontinuities. Mechanical testing pulls tensile bars from each lot, and hydrostatic testing applies to pressure-retaining components where the design states. Dimensional inspection proves the machining allowances, and visual examination clears surfaces of laps, seams, and forging defects.

Benefits of Cupro Nickel 70/30 Forgings

Choosing forged 70/30 cupro-nickel over leaner alloys or cast alternatives delivers six key advantages for demanding applications.

Superior corrosion resistance to 90/10 Cu-Ni. Three times the nickel deepens the protective film and widens the safe operating envelope.
Seawater velocity of 4.5 m/s leaves no measurable erosion loss.
Structural integrity comes from forged grain flow; there’s none of the shrinkage porosity that castings can carry.
Maintenance intervals stretch out because bores and sealing faces stay clean and uncorroded.
Service life runs to decades in continuous immersion.
Whole-life cost drops below coated steel once repair and replacement budgets enter the comparison.

Manufacturing Process of Cupro Nickel 70/30 Forgings

Cupro Nickel 70/30 Forgings Application

Exporter, Manufacturer & Supplier of Cupro Nickel 70/30 Forgings in various grades, sizes, shapes and specifications.

FAQs

What Are Cupro Nickel 70/30 Forgings?

Cupro Nickel 70/30 Forgings are hot-worked components in UNS C71500, which pairs a nominal 70% copper base with 30% nickel for seawater duty.

How Are Cupro Nickel 70/30 Forgings Different From 90/10 Forgings?

Nickel content triples in the 70/30 grade, raising strength, velocity tolerance, and corrosion margin over the leaner 90/10 alloy.

Which Standards Are Followed for Cupro Nickel 70/30 Forgings?

Production references ASTM B151, B171, B466, and B122 as applicable, and every order carries EN 10204 3.1 certification.

What Types of Cupro Nickel 70/30 Forgings Do You Manufacture?

Rings, flanges, shafts, bushings, sleeves, discs, valve and pump parts, open die shapes, and custom pieces to drawings all leave our forge.

Are Cupro Nickel 70/30 Forgings Suitable for High-Velocity Seawater Systems?

Yes. The alloy accepts seawater moving at 4.5 m/s, so forged parts serve pump discharge and firewater duty without erosion loss.

Which Industries Commonly Use Cupro Nickel 70/30 Forgings?

Naval shipbuilding, offshore oil and gas, desalination, power generation, and heat exchanger manufacturing place the bulk of forging orders.

Can You Manufacture Custom Cupro Nickel 70/30 Forgings as per Drawings?

Yes. Send dimensioned drawings and tolerances, and we’ll confirm forging feasibility, machining scope, and delivery before you commit.

Do You Provide Mill Test Certificates and Third-Party Inspection?

Yes. Type 3.1 certificates to EN 10204 accompany each order, and inspection agencies appointed by the buyer can witness tests.