Copper-Nickel 70/30 (UNS C71500) — Chemical Composition & Mechanical Properties
Copper-Nickel 70/30 (UNS C71500) is a copper-nickel (cu-ni) grade for cu-ni pipe, fittings & flanges (UNS C71500, EN / W.Nr CW354H (2.0882)). It is also known as CuNi30Mn1Fe. This sheet summarises its chemical composition limits, minimum mechanical properties, heat treatment and typical service. Teshi Group supplies this grade as a stockist and supplier, and manufactures matching flanges and fittings.
Copper-Nickel 70/30 (UNS C71500) at a glance
| Specification | Copper-Nickel 70/30 (UNS C71500) |
|---|---|
| Material family | Copper-nickel (Cu-Ni) |
| Product form | Cu-Ni pipe, fittings & flanges |
| UNS number | C71500 |
| EN / W.Nr equivalent | CW354H (2.0882) |
| Also known as | CuNi30Mn1Fe |
| Document | TG-MG-098 · Rev. 1 · October 2026 |
Typical service
High-velocity seawater, condensers and desalination
Heat treatment
Annealed (O60, soft anneal)
Chemical composition of Copper-Nickel 70/30 (UNS C71500) (weight %)
Single values are maximums unless shown as a range or “min”.
Mechanical properties
| Tensile strength, min | 359 MPa |
|---|---|
| Yield strength (0.2 % offset), min | 124 MPa |
| Hardness | Not specified |
About copper-nickel (cu-ni)
Copper-nickel (cupro-nickel) alloys combine good seawater corrosion resistance with natural resistance to biofouling. They are the traditional piping material for ship seawater systems, offshore firewater and desalination.
Reference information compiled from the published standard for convenience. It does not replace the current edition of the governing standard, which takes precedence. Verify critical dimensions and properties before design, purchase or fabrication. Teshi Engineers & Sales Promoters (P) Ltd accepts no liability for errors or omissions.
International equivalents of Copper-Nickel 70/30 (UNS C71500)
All equivalents| Standard system | Nearest equivalent grade |
|---|---|
| USA — specification | Copper-Nickel 70/30 (UNS C71500) |
| USA — UNS | C71500 |
| Europe — EN designation | CuNi30Mn1Fe (EN 12449) |
| Europe — W.Nr | CW354H (2.0882) |
| Japan — JIS | C7150 (JIS H3300) |
| China — GB / NB | BFe30-1-1 (GB/T 8890) |
| China — old GB designation | BFe30-1-1 |
| UK — BS (withdrawn) | CN107 |
Equivalents are the nearest commonly cited grades. Chemistry, mechanical properties and testing differ between standards — compare them before substituting one for another.
Same alloy in other product forms
| Product form | Specification / grade |
|---|---|
| Seamless pipe | ASTM B466 C71500 |
| Welded pipe | ASTM B467 C71500 |
| Flanges | ASTM B151 bar |
| Plate | ASTM B171 C71500 |
Other copper-nickel (cu-ni) grades
Copper-nickel (Cu-Ni) overviewStandards for Copper-Nickel 70/30 (UNS C71500)
All material standardsFAQ
Copper-Nickel 70/30 (UNS C71500): common questions
What is the minimum yield strength of Copper-Nickel 70/30 (UNS C71500)?
124 MPa, with a minimum tensile strength of 359 MPa.
What is the UNS number and EN equivalent of Copper-Nickel 70/30 (UNS C71500)?
UNS C71500; the nearest European designation is W.Nr CW354H (2.0882). Equivalents are close but not identical — check the specification if substituting.
How is Copper-Nickel 70/30 (UNS C71500) heat treated?
Annealed (O60, soft anneal).
What is the Chinese (GB) equivalent of Copper-Nickel 70/30 (UNS C71500)?
The nearest Chinese equivalent is BFe30-1-1 (GB/T 8890), formerly BFe30-1-1. Equivalents are close but not identical — compare chemistry and properties before substituting.
What is the JIS equivalent of Copper-Nickel 70/30 (UNS C71500)?
The nearest Japanese (JIS) equivalent is C7150 (JIS H3300).
Does Teshi Group supply Copper-Nickel 70/30 (UNS C71500)?
Teshi Group supplies this grade as a stockist and supplier, and manufactures matching flanges and fittings. Send your size, rating and quantity to info@teshigroup.com for a quotation with EN 10204 3.1 certificates.
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