Copper-nickel alloy containing approximately 30% nickel, with controlled iron and manganese additions that support seawater corrosion and erosion-corrosion resistance.
Material gradeCupro Nickel Grades
/ 01 — TECHNICAL OVERVIEW
CuNi 70/30 (UNS C71500)
Nesco Pipe & Tubes is a manufacturer, supplier, stockist and exporter of CuNi 70/30 (UNS C71500), offering pipes, tubes, flanges, butt weld fittings, sheets, plates, coils and round bars in specified dimensions, finishes, conditions and testing requirements for industrial and project applications. Availability and applicable standards are confirmed against the customer’s purchase specification.
Copper Nickel 70/30 is a higher-nickel copper-nickel alloy widely used in seawater piping, shipbuilding, offshore systems, condensers and heat exchangers. It offers enhanced resistance to seawater corrosion, erosion-corrosion and marine biofouling, together with good fabrication and welding characteristics.
It is selected for demanding seawater, condenser and marine service, including applications involving higher flow velocities and turbulent conditions.
The correct material depends on more than corrosion resistance alone. Temperature, pressure, seawater chemistry, flow velocity, erosion, fabrication route, weldability, mechanical strength, product form, code requirements and lifecycle cost should be reviewed together. Final grade selection remains with the customer’s qualified engineer, designer or material specialist.
How it is made
01
Copper and nickel feedstock are melted and refined under controlled conditions to achieve the required CuNi 70/30 (UNS C71500) chemistry.
02
Casting and hot working produce the required billet, slab, tube shell or other starting form for the selected product.
03
Extrusion, drawing, rolling, forging or forming establishes the required dimensions, tolerances and mechanical condition according to the product form.
04
Annealing, cleaning and surface finishing are carried out as specified to achieve the required metallurgical condition and surface quality.
05
Dimensions, material identity, applicable testing and certification are verified heat-wise against the relevant product specification and inspection requirements.
Request reviewed quotation Material documents on request
/ 02 — PRODUCT DETAIL
Built around the specification.
Key characteristics and commonly referenced standards for CuNi 70/30 (UNS C71500).
Key features01 02 03 04
Available across multiple product forms, subject to the applicable product specification, dimensions and availability.
Heat-wise traceability and material test certificate support.
PMI, NDT and third-party inspection options against specified inspection requirements.
Common specification references
STD
ASTM B466/B466M — Seamless copper-nickel pipe and tube, where applicable
STD
ASTM B467 — Welded copper-nickel pipe, where applicable
STD
ASTM B171/B171M — Copper-alloy plate and sheet for pressure vessels, condensers and heat exchangers, where applicable
STD
ASTM B151/B151M — Copper-nickel rod and bar, where applicable
STD
ASME B16 / project drawing — Flange and fitting dimensions, where applicable
STD
Naval / project specification — Service-specific testing, cleanliness, inspection and acceptance requirements, where specified
/ 03 — MATERIAL RANGE
Grades matched to the service.
Commonly requested families are shown below. Availability is confirmed against the complete specification.
Material familyCommon gradesTypical selection context
Specified gradeCuNi 70/30 (UNS C71500)
Supply is reviewed by product form, governing standard, condition and service
Alloy familyCopper-Nickel (Cu-Ni)
Related Cu-Ni grades are reviewed against the specified application and requirements; they are not treated as automatic substitutes
/ 04 — SUPPLY & CUSTOMISATION
Available forms and enquiry basis.
Pipes, tubes, flanges, butt weld fittings, sheets and plates, and round bars. Coil enquiries are rare and reviewed only against a complete specification.
ParameterTypical Options
01Available forms
Pipes, tubes, flanges, butt weld fittings, sheets, plates and round bars, subject to specification and availability
02Product standard
Applicable material and product standard for the selected pipe, tube, flat product, bar, flange or fitting form
03Supply condition
Annealed, cold worked, hot worked, pickled, polished or as specified
04Dimensions
Product-form dimensions, tolerances, cut lengths and end/edge preparation, as applicable
05Testing
PMI, mechanical, hardness, corrosion, NDT or supplementary testing as required
06Documentation
Material test certificates, inspection reports and other quality documentation as specified or requested
07Enquiry basis
Grade / UNS, product form, applicable standard, dimensions, quantity and delivery destination
/ 05 — DIMENSIONS & SIZE RANGE
Dimensions aligned to the manufacturing route.
Dimensions must be specified for the selected product form; a grade designation alone does not define size, tolerance, finish or supply condition.
Product formOrdering dimensionsCondition / finishStandard basis
PipeNPS/OD, wall thickness or schedule, length and endsSeamless/welded, annealed, heat treated or finished as specifiedApplicable pipe material and dimensional standards
TubeOD, wall thickness, length or coil/U-bend geometrySeamless/welded, annealed and surface finish as specifiedApplicable product standard
Flat productThickness, width, length or coil geometryHot/cold rolled, annealed, pickled or polished as specifiedApplicable flat-product material standard
Bar / forgingDiameter/profile, tolerance and cut lengthHot worked, forged, cold finished or machined as specifiedApplicable bar/forging material standard
/ 06 — MANUFACTURING STANDARDS
Standards aligned for every order.
The material standard, dimensional standard and project requirements should be stated separately.
CuNi 70/30 product-standard references
StandardWhat it covers
ASTM B466/B466MSeamless copper-nickel pipe and tube — Tubular products
ASTM B467Welded copper-nickel pipe — Tubular products
ASTM B171/B171MCopper-alloy plate and sheet for pressure vessels, condensers and heat exchangers — Flat products
ASTM B151/B151MCopper-nickel rod and bar — Long products
ASME B16 / project drawingFlange and fitting dimensions, where applicable — Piping components
Naval / project specificationService-specific testing, cleanliness, inspection and acceptance requirements, where specified — Project-specific
/ 07 — REFERENCE MATERIAL DATA
CuNi 70/30 (UNS C71500) material reference
A concise engineering reference for procurement. Exact chemical limits and mechanical acceptance values vary by product form, size, condition and applicable specification; the certified material test certificate governs the supplied material.
Alloy identity and chemistryPrincipal alloying profile; certification limits follow the ordered standard.
Material referenceTechnical profile
Grade / designationCuNi 70/30 (UNS C71500)
Alloying systemCopper-nickel alloy containing nominally about 30% nickel, with controlled iron and manganese additions
Certification basisHeat analysis and product requirements are certified against the exact material specification stated on the purchase order
Mechanical-property basisProduct-form and condition dependent; verify certified values.
Property basisSupply requirement
Mechanical profileStrength and ductility depend on grade, condition, product form and degree of cold work; requirements for tube, pipe, plate and bar are not interchangeable
Acceptance valuesTensile strength, yield strength, elongation and hardness limits are verified against the ordered product-form standard and specified condition
CertificationActual heat/lot results are reported on the agreed material test certificate
/ 08 — INSPECTION & TESTING
Evidence before dispatch.
01Grade / UNS and applicable product-standard verification
02Heat-number traceability and material test certificate review
03PMI against the specified grade and alloy chemistry
04Dimensions, tolerances and surface-condition inspection
05Mechanical and hardness testing as required by the applicable product specification
06Corrosion, metallurgical or other supplementary testing where specified
07NDT and third-party inspection or witnessing against the approved inspection plan
Testing requirements are applied according to the applicable material/product standard, purchase specification and approved inspection plan.
/ 09 — PACKAGING & MARKING
Protected and traceable.
01Product-form-specific protection for surfaces, machined faces and ends
02Heat-wise segregation and durable grade / heat identification
03Non-contaminating separators and protective materials suitable for copper-nickel products
04Moisture-resistant wrapping, crates or export packaging where required
05Package markings aligned with grade, heat number, dimensions, quantity and purchase order
Packaging and marking can be adapted to customer, project and export requirements.
/ 10 — APPLICATIONS & INDUSTRIES
Engineered for demanding service environments.
From process plants to marine systems, NESCO coordinates material, dimensions and documentation around the operating conditions of each application.
01
Chemical processing02
Oil and gas03
Power generation04
Marine systems05
Heat exchangers06
Industrial fabricationIndustries servedOne supply partner across critical sectors.
/ 11 — WHY NESCO PIPE & TUBES
Built for buyers who cannot leave details to chance.
From specification review to export documentation, NESCO coordinates the technical and commercial details as one complete supply requirement.
01
Specification control
NESCO reviews the grade, product standard, dimensions, condition and acceptance criteria as one coordinated requirement.
02
Multi-material sourcing
Stainless steel, duplex, nickel alloy, copper-nickel and titanium requirements can be combined within one project enquiry.
03
Traceable documentation
Heat numbers, MTCs and agreed inspection records are aligned with the purchase order before dispatch.
04
Inspection coordination
PMI, dimensional checks, NDT and third-party witnessing can be arranged against an approved inspection plan.
05
Value-added processing
Cutting, machining, end preparation, polishing or protective finishing can be reviewed with the base material supply.
06
Export-ready packing
Identification, surface protection and packing are planned around product geometry and the final transport route.
07
Responsive RFQ review
Technical and commercial inputs are consolidated early so queries are resolved before quotation and production.
08
One accountable supply desk
NESCO provides a single contact for material, processing, documentation, packing and delivery coordination.
/ 12 — FREQUENTLY ASKED QUESTIONS
Clear answers before you specify.
Quick guidance on product selection, standards, dimensions, inspection and documentation. For project-specific requirements, NESCO will review the complete enquiry with your team.
01What product forms are available in CuNi 70/30 (C71500)?
Availability can include pipes, tubes, flanges, fittings, sheets, plates, coils and bars, but each form must be confirmed against its own material standard and production range.
02What standard should be specified for CuNi 70/30 (C71500)?
State both the exact grade/UNS and the product-form material standard. A plate specification cannot be assumed to cover pipe, tube, bar, flange or fitting supply.
03Can NESCO provide chemical and mechanical certificates?
Yes. An agreed material test certificate can report heat analysis and mechanical results required by the ordered specification.
04Can another grade be substituted?
Only with written approval from the responsible engineer after reviewing corrosion, strength, temperature, fabrication and code requirements.
05What information produces the fastest quotation?
Provide grade/UNS, product form, standard, size, condition, quantity, tests, certification and delivery destination.
/ 13 — REQUEST FOR QUOTATION Nesco direct sales desk
Ready to source?Start with the details you already have.
Our team will review the grade, dimensions, testing and delivery requirements together.