LEADING COPPER NICKEL 90/10 & 70/30 COLLAR MANUFACTURER & EXPORTER — ISO 9001:2015 CERTIFIED
Manufacturer, Exporter & Supplier of Copper-Nickel 90/10 & 70/30 Stub End Collar — ASME B16.9 · MSS SP-43 · MSS SP-75
Leading Copper Nickel Stub End Manufacturer, Supplier & Exporter of Lap Joint Stub Ends, Van Stone Stub Ends and Butt Weld Stub Ends in CuNi 90/10 (UNS C70600) and CuNi 70/30 (UNS C71500) conforming to ASME B16.9, MSS SP-43, MSS SP-75, ASTM B466, DIN, EN 1092-1, JIS and ISO standards.
Sunflex Metalloy is a specialist Copper Nickel Stub End Manufacturer, Supplier, Exporter, Stockist and Dealer, producing the complete range of Copper Nickel Stub Ends — also known as Copper Nickel Lap Joint Stub Ends, Copper Nickel Van Stone Stub Ends and Copper Nickel Butt Weld Stub Ends — in CuNi 90/10 (UNS C70600 / CW352H / CuNi10Fe1Mn) and CuNi 70/30 (UNS C71500 / CW354H / CuNi30Mn1Fe). A stub end is welded to the pipe end and used together with a loose (lap joint) backing flange, allowing the flange to rotate freely for bolt-hole alignment — a design that dramatically simplifies installation, reduces bolt-load stress on the pipe, and allows an inexpensive carbon steel or stainless steel flange to be used behind a fully corrosion-resistant CuNi wetted surface.
Our Copper Nickel Stub End Collars are manufactured as forged stub ends, seamless stub ends and welded stub ends depending on size and application, in full compliance with ASME B16.9 (long pattern), MSS SP-43 (short pattern) and MSS SP-75 (high-pressure applications), plus DIN Lap Joint Stub End, DIN Van Stone Collar, EN 1092-1 Stub End, JIS Stub End, JIS Lap Joint Collar, ISO Lap Joint Stub End and ISO Stub End Collar equivalents for international projects.
As one of the most recognised Copper Nickel Stub End Manufacturers in India, we supply stub ends worldwide for marine piping, offshore platforms, shipbuilding, desalination plants, power generation facilities and petrochemical process piping — every batch backed by an EN 10204 3.1 Mill Test Certificate, dimensional inspection report, PMI test and, where required, third-party inspection certification.
Material: CuNi 90/10 / CuNi 70/30
UNS: C70600 / C71500 / C70620 / C71640
EN: CW352H / CW354H
DIN: CuNi10Fe1Mn (2.0872) / CuNi30Mn1Fe (2.0882)
Standards: ASME B16.9 · MSS SP-43 · MSS SP-75
Size: ½" (DN15) to 48" (DN1200) NB & Custom
Pattern: Lap Joint / Van Stone / Butt Weld
Pressure: Class 150 to Class 2500
MTC: EN 10204 3.1 supplied
Request a Quote| Element | CuNi 90/10 — UNS C70600 (CW352H / CuNi10Fe1Mn) | CuNi 70/30 — UNS C71500 (CW354H / CuNi30Mn1Fe) |
|---|---|---|
| Copper (Cu) | Remainder (min 86.5%) | Remainder (min 65.0%) |
| Nickel + Cobalt (Ni + Co) | 9.0 – 11.0% | 29.0 – 33.0% |
| Iron (Fe) | 1.0 – 1.8% | 0.40 – 1.0% |
| Manganese (Mn) | 0.5 – 1.2% | 1.0% max |
| Lead (Pb) | 0.05% max | 0.02% max |
| Carbon (C) | 0.05% max | 0.05% max |
| Sulphur (S) | 0.02% max | 0.02% max |
| Zinc (Zn) | 1.0% max | 0.50% max |
| Property | CuNi 90/10 (UNS C70600) | CuNi 70/30 (UNS C71500) | Test Standard |
|---|---|---|---|
| Tensile Strength (UTS) | 275 MPa min (40 ksi) | 380 MPa min (55 ksi) | ASTM E8 / ISO 6892-1 |
| Yield Strength (0.2% PS) | 105 MPa min (15 ksi) | 170 MPa min (25 ksi) | ASTM E8 / ISO 6892-1 |
| Elongation (in 50 mm) | 30% min | 30% min | ASTM E8 / ISO 6892-1 |
| Hardness | 45 HRB max | 65 HRB max | ASTM E18 / ISO 6508 |
| Density | 8.94 g/cm³ | 8.95 g/cm³ | – |
| Modulus of Elasticity | 135 GPa | 150 GPa | – |
| Thermal Conductivity | 40 W/m·K | 29 W/m·K | – |
| Melting Point (Approx.) | 1100°C | 1170°C | – |
| NPS (inch) | DN | Hub O.D. (mm) | Flange Face O.D. (mm) | Overall Length (mm) | Min. Wall (mm) |
|---|---|---|---|---|---|
| 1/2" | DN15 | 21.3 | 90 | 38 | 1.65 |
| 3/4" | DN20 | 26.7 | 100 | 38 | 1.65 |
| 1" | DN25 | 33.4 | 110 | 51 | 1.65 |
| 1 1/2" | DN40 | 48.3 | 135 | 57 | 1.65 |
| 2" | DN50 | 60.3 | 150 | 64 | 1.65 |
| 3" | DN80 | 88.9 | 190 | 79 | 3.05 |
| 4" | DN100 | 114.3 | 230 | 90 | 3.05 |
| 6" | DN150 | 168.3 | 280 | 108 | 3.4 |
| 8" | DN200 | 219.1 | 345 | 121 | 3.76 |
| 10" | DN250 | 273.0 | 405 | 133 | 4.19 |
| 12" | DN300 | 323.9 | 485 | 146 | 4.57 |
| 16" | DN400 | 406.4 | 580 | 165 | 4.78 |
| 20" | DN500 | 508.0 | 715 | 187 | 5.54 |
| 24" | DN600 | 609.6 | 840 | 210 | 6.35 |
* Dimensions are indicative and manufactured to the purchaser's drawing / applicable standard (ASME B16.9, MSS SP-43, MSS SP-75, DIN 86037). Custom sizes, special wall thicknesses and non-standard face preparations manufactured on request. Full certified drawings issued on order confirmation.
Prime-grade CuNi 90/10 / CuNi 70/30 billet sourced from certified mills. Incoming chemical composition verified by PMI (XRF) and spectrochemical analysis before production.
Depending on size, stub end blanks are either hot forged from CuNi billet for superior grain structure, or formed from certified seamless CuNi pipe — both routes engineered to meet ASME B16.9 / MSS SP-43 dimensional tolerances.
Stub end blanks CNC-machined to achieve the precise bore, lap face diameter, radius and overall length specified in ASME B16.9, MSS SP-43 or MSS SP-75, ensuring correct seating with the mating loose flange.
100% dimensional check, hydrostatic pressure test, spectrochemical chemical analysis, mechanical testing (tensile / hardness), visual inspection and PMI. EN 10204 3.1 MTC issued.
A Copper Nickel Stub End Collar (also called a Lap Joint Stub End or Van Stone Stub End) is a short CuNi pipe fitting welded to the pipe end, used together with a separate loose backing flange that rotates freely over the stub end's lap. This allows bolt holes to be aligned without rotating the pipe, and lets the wetted surface be made of expensive CuNi while the structural flange uses a lower-cost material.
These terms describe the same component from two perspectives: 'Butt Weld' refers to how the stub end is joined to the pipe (a butt weld), while 'Lap Joint' refers to how it is used in the flanged assembly (with a loose lap joint flange). Sunflex Metalloy's Copper Nickel Stub End Collars are suitable for both descriptions.
Yes. Depending on size and application requirement, Sunflex Metalloy manufactures Copper Nickel Stub End Collars via forging (for superior grain structure in critical applications), from seamless pipe (for standard applications), and via welded construction (for larger diameters) — all fully compliant with ASME B16.9 / MSS SP-43 dimensional requirements.
Copper Nickel Stub Ends are extensively used in shipbuilding and naval vessels, offshore oil & gas platforms, seawater desalination plants (MSF/SWRO), power generation condenser and cooling water systems, and marine heat exchanger piping, owing to CuNi's outstanding resistance to seawater corrosion and biofouling.
Share your size, grade (CuNi 90/10 / CuNi 70/30), applicable standard and quantity for a competitive quotation with EN 10204 3.1 MTC.
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