Cupro Nickel 70/30 Pipe Fittings
Metracore Alloys manufactures Cupro Nickel 70/30 Pipe Fittings on a forming line reserved for copper-nickel work. That separation keeps ferrous contamination away from bore surfaces and weld bevels. Also called UNS C71500, it combines nickel in the 29 to 33% band with copper as the balance, plus iron and manganese additions that toughen its surface film.
The higher nickel content earns its cost in three ways. Strength comes first, with annealed tensile strength starting at 360 MPa, enough for the pressures naval and offshore mains carry. Velocity tolerance follows: typical design limits for 70/30 run to around 4.5 m/s in clean seawater, where 90/10 is generally held near 3.5 m/s. Actual limits depend on bore size and system geometry. The third gain is erosion-corrosion resistance, because the iron-enriched film stays put under turbulence that scours softer alloys off elbow heels and reducer throats. Shipyards, platform contractors, and desalination plants specify Copper Nickel 70/30 Pipe Fittings for precisely those heavily loaded seawater circuits. Production covers buttweld bores from half an inch through 24 inches, standard and custom.
Why Metracore Alloys?
- Cupro Nickel 70/30 Pipe Fittings Specification
- Available Pipe Fitting Types
- Technical Details of Cupro Nickel 70/30 Pipe Fittings
- Cupro Nickel 70/30 Pipe Fittings Chemical Composition
- Cupro Nickel 70/30 Pipe Fittings Physical & Mechanical Properties
- Manufacturing Process of Cupro Nickel 70/30 Pipe Fittings
- Cupro Nickel 70/30 Pipe Fittings Application
Cupro Nickel 70/30 Pipe Fittings Specification
Material Grade
Cupro Nickel 70/30 (Cu-Ni 70/30)
UNS Number
C71500
ASTM Standard
ASTM B466 (pipe), ASTM B122 (plate and sheet)
Product Type
Buttweld fittings in seamless or welded execution
Pipe Size Range
DN 15 – DN 600 (½ in. – 24 in.)
Wall Thickness
Schedule 10, 40, and 80; thicker walls on enquiry
Pressure Class
Matches the connecting pipe schedule per ASME B16.9
End Connection
Buttweld ends, bevelled for welding
Manufacturing Process
Hot and cold forming from certified pipe and plate, machined weld ends
Inspection Standards
PMI, hydrostatic, dimensional, mechanical, and visual testing
Certification
EN 10204 3.1 Mill Test Certificate
Available Pipe Fitting Types
90° Elbow
45° Elbow
Equal Tee
Reducing Tee
Long Radius Bend
Concentric Reducer
Eccentric Reducer
Pipe Cap
Stub End
Cross
Reach out to Metracore Alloys for reliable Cupro Nickel 70/30 Pipe Fittings solutions
Technical Details of Cupro Nickel 70/30 Pipe Fittings
Cupro Nickel 70/30 Pipe Fittings Chemical Composition
“Engineered for high-pressure and corrosive marine environments, our Cupro Nickel 70/30 Buttweld Pipe Fittings are available in ten versatile structural shapes.”
| Ni % | Fe % | Mn % | Pb % | Zn % | Cu % |
|---|---|---|---|---|---|
| 29.0 – 33.0 | 0.40 – 1.0 | ≤ 1.0 | ≤ 0.05 | ≤ 1.0 | Remainder |
Cupro Nickel 70/30 Pipe Fittings Physical & Mechanical Properties
| Tensile Strength | Yield Strength | % Elongation | Hardness | Density | Thermal Conductivity | Electrical Conductivity |
|---|---|---|---|---|---|---|
| 360 MPa min (52 ksi), annealed | 105 MPa min (15 ksi), annealed per ASTM B466 | 45% (typical, annealed) | approx. 72 HRB, annealed | 8.94 g/cm³ (0.323 lb/in³) | 29 W/m·K (20°C) | 4.6% IACS (annealed) |
Material Overview of Cupro Nickel 70/30 Pipe Fittings
Cu-Ni 70/30 Pipe Fittings are formed from a single-phase solid-solution alloy in which nickel dissolves completely in copper, pairing strength with ductility. Iron between 0.40% and 1.0% anchors the corrosion film against fast-moving seawater. Manganese aids hot working.
Saltwater barely touches the alloy. Impingement attack, the localised damage where entrained air and turbulence strike a surface, progresses slowly here, and general corrosion stays negligible year after year. Fabricators weld it by TIG or MIG with matching 70/30 filler and no post-weld heat treatment. Systems built from it serve for decades in aggressive marine duty.
Performance Advantages
Engineers and procurement teams specify 70/30 Cupro Nickel Fittings based on eight key operational advantages.
- 70/30 Cupro Nickel offers outstanding seawater endurance because a protective nickel- and iron-enriched oxide film develops immediately upon immersion, holding thinning rates near zero.
- Its erosion-corrosion resistance stands apart because the protective film withstands flow turbulence that typically strips protection from leaner copper alloys.
- Marine organisms struggle to colonise the bore, so biofouling rarely restricts flow area.
- Tensile strength of 360 MPa minimum supports higher pressure ratings at a given wall.
- Flow at up to 4.5 m/s sits inside accepted design limits.
- Operational life stretches across decades of continuous seawater duty.
- Upkeep stays light; there’s no internal lining or coating programme to budget for.
- Offshore exposure, splash zones included, falls within the alloy’s service range.
Standards, Testing & Certification
Raw material enters production as ASTM B466 seamless copper-nickel pipe or ASTM B122 plate. Dimensions follow ASME B16.9 for buttweld geometry, ASME B16.28 for short radius returns and elbows, and MSS SP-43 for light-wall patterns. Purchase orders calling for ASTM B466 Cupro Nickel 70/30 Pipe Fittings receive material certified against that specification. These five checks precede despatch. PMI establishes alloy identity, and a hydrostatic hold confirms pressure integrity. Gauging checks the dimensions, mechanical tests cover each heat, and a visual screen clears weld ends and surfaces. EN 10204 3.1 certificates record every result.
Manufacturing Process of Cupro Nickel 70/30 Pipe Fittings
Cupro Nickel 70/30 Pipe Fittings Application
Products
Exporter, Manufacturer & Supplier of Cupro Nickel 70/30 Pipe Fittings in various material and sizes.