LEADING COPPER NICKEL 90/10 & 70/30 COLLAR MANUFACTURER & EXPORTER — ISO 9001:2015 CERTIFIED
Manufacturer, Exporter & Supplier of Copper-Nickel 90/10 & 70/30 Welding Neck Collar — DIN 86037 · EEMUA 145 · ASME B16.5
Manufacturer, Supplier & Exporter of Copper-Nickel Welding Neck Collars in UNS C70600 (CuNi 90/10 / CW352H / CuNi10Fe1Mn) and UNS C71500 (CuNi 70/30 / CW354H / CuNi30Mn1Fe) conforming to DIN 86037, EEMUA 145, ASME B16.5, ASTM B466, EN 1092-1, JIS, ISO, MIL-T-16420, NAVSEA T9074 and NORSOK standards.
A Copper Nickel Welding Neck Collar is a precision-forged and machined fitting welded directly to the end of a CuNi pipe, providing the wetted, corrosion-resistant contact face that mates with a low-cost carbon steel or stainless steel loose/backing flange — commonly known as a Van Stone or composite flange assembly. This design is the industry-standard, cost-effective way to specify Copper-Nickel piping systems: only the collar (the part in contact with seawater) is manufactured in expensive CuNi 90/10 or CuNi 70/30 alloy, while the structural backing flange can be a lower-cost material, delivering significant material cost savings without compromising corrosion performance.
As a leading Copper Nickel Collar Manufacturer, Supplier and Exporter in India, Sunflex Metalloy produces Welding Neck Collars to DIN 86037 and EEMUA 145 — the two most widely referenced international specifications for CuNi welding neck collars used with loose flanges — as well as to ASME B16.5 hub and facing dimensions on request. Every collar is forged from certified CuNi 90/10 (UNS C70600) or CuNi 70/30 (UNS C71500) billet and CNC-machined to achieve the specified bore, hub length, back-face and raised-face finish.
Every Copper Nickel Welding Neck Collar batch is inspected and tested in our in-house laboratory and supplied with a complete EN 10204 3.1 Mill Test Certificate covering chemical analysis, mechanical testing, dimensional inspection, hydrostatic pressure test and PMI results — making Sunflex Metalloy a trusted Copper Nickel Collar Manufacturer, Supplier, Exporter, Stockist and Dealer for marine and offshore buyers worldwide.
Material: CuNi 90/10 / CuNi 70/30
UNS: C70600 / C71500 / C70620 / C71640
EN: CW352H / CW354H
DIN: CuNi10Fe1Mn (2.0872) / CuNi30Mn1Fe (2.0882)
Standards: DIN 86037 · EEMUA 145 · ASME B16.5
Size: ½" (DN15) to 48" (DN1200) NB & Custom
Pattern: Standard Pattern (DIN 86037 / EEMUA 145)
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.
Billet heated and forged using hydraulic presses to the welding-neck collar blank geometry, ensuring superior grain flow and eliminating internal voids for maximum structural integrity at the weld root and sealing face.
Collar blanks machined on CNC turning and boring centres to achieve the precise bore diameter, hub length, back-face flatness and raised-face finish specified in DIN 86037, EEMUA 145 or ASME B16.5.
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 Welding Neck Collar is welded onto the end of a CuNi pipe to create the wetted sealing face of a flanged joint, while a separate loose backing flange (carbon steel, stainless steel, or CuNi) clamps it in place. This Van Stone-style assembly is the standard, most economical way to specify corrosion-resistant flanged connections in marine and offshore CuNi piping systems.
Sunflex Metalloy manufactures Copper Nickel Welding Neck Collars to DIN 86037 and EEMUA 145 — the primary international references for CuNi collars used with loose flanges — as well as ASME B16.5, ASTM B466, EN 1092-1, JIS, ISO, MIL-T-16420, NAVSEA T9074 and NORSOK on request.
The terms are closely related: a Welding Neck Collar (per DIN 86037/EEMUA 145) and a Stub End (per ASME B16.9/MSS SP-43) both describe a short CuNi hub piece welded to pipe and used with a loose backing flange. 'Welding Neck Collar' is the common European/marine terminology, while 'Stub End' is the common ASME/American terminology for the same functional component — Sunflex Metalloy manufactures both naming conventions to the applicable standard.
Yes. In addition to standard sizes from ½" NB (DN15) to 24" NB (DN600), Sunflex Metalloy manufactures Welding Neck Collars up to 48" NB (DN1200) and in custom hub lengths, bore diameters and face preparations based on the purchaser's drawing.
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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