LEADING COPPER NICKEL 90/10 & 70/30 COLLAR MANUFACTURER & EXPORTER — ISO 9001:2015 CERTIFIED
Manufacturer & Exporter of Copper-Nickel 90/10 & 70/30 Welding Neck Collars & Stub End Collars
Sunflex Metalloy Pvt. Ltd. — ISO 9001:2015 Certified Copper Nickel Stub End Manufacturer producing Welding Neck Collars, Short & Long Weld Neck Collars, Stub End Collars, Short & Long Stub End Collars to ASME B16.9, MSS SP-43, ASTM B466, DIN, EN, JIS, ISO & Military/Marine standards.
Sunflex Metalloy Pvt. Ltd., headquartered in Umbergaon, Gujarat, India, is a dedicated Copper Nickel Stub End Manufacturer, Supplier and Exporter of Copper-Nickel (Cu-Ni) Collars in grades CuNi 90/10 (UNS C70600 / CW352H / CuNi10Fe1Mn) and CuNi 70/30 (UNS C71500 / CW354H / CuNi30Mn1Fe). Our complete collar product range includes Copper Nickel Welding Neck Collar, Short Weld Neck Collar, Long Weld Neck Collar, Stub End Collar, Short Stub End Collar and Long Stub End Collar — including Lap Joint Stub End and Van Stone Stub End configurations — engineered for marine piping systems, offshore platforms, shipbuilding, desalination plants, power generation facilities and seawater handling systems worldwide.
All Copper-Nickel collars are manufactured and tested in strict conformance with ASTM B466, ASTM B467, ASTM B111, ASTM B543, ASTM B359, ASTM B552, ASTM B608, ASTM B42, ASTM B68, ASTM B75 and their ASME SB equivalents — ASME SB466, ASME SB467, ASME SB111, ASME SB543, ASME SB359, ASME SB552. We also comply with European standards EN 12449, EN 12451, EN 1057, EN 12735-1, EN 13348; German DIN standards DIN 86019, DIN 86018, DIN 1785, DIN 17664; Japanese JIS H3300, JIS H3330; International ISO 1634, ISO 7268; British BS 2871, BS EN 12449, BS EN 12451; and Military/Marine grades MIL-T-16420, MIL-C-15726, NAVSEA T9074, DEF STAN and NORSOK.
Every batch is accompanied by full Mill Test Certificates (EN 10204 3.1), covering chemical composition, mechanical properties, dimensional inspection, hydrostatic pressure testing and non-destructive examination results.
ISO 9001:2015 Certified Manufacturer
Grades: UNS C70600 & UNS C71500
Standards: ASTM / ASME / EN / DIN / JIS / ISO / BS / MIL
Sizes: ½" (DN15) to 24" (DN600) NB & Custom
Pressure: Class 150 to Class 2500
100% MTC (EN 10204 3.1) with every supply
Export to 30+ Countries Worldwide
Backed by 35+ Years Manufacturing Experience
Request a QuoteAs a specialist Copper Nickel Stub End Manufacturer, Supplier and Exporter, Sunflex Metalloy produces seven standard configurations of Copper Nickel Welding Neck Collars, Copper Nickel Stub End Collars and Copper Nickel Composite Flanges in CuNi 90/10 (UNS C70600) and CuNi 70/30 (UNS C71500) grades, conforming to ASME B16.5, ASME B16.9, MSS SP-43, MSS SP-75, ASTM B466, DIN 86037, EN 1092-1, JIS and ISO standards. All collars are available as forged, seamless, welded or machined construction with full dimensional and material certification.
CuNi 90/10 & 70/30 welding neck collars for permanent, leak-resistant flange connections in marine piping, seawater cooling and offshore platform systems.
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Short pattern CuNi weld neck collars for compact, space-constrained flange assemblies in desalination plants, shipbuilding and offshore systems.
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Long pattern CuNi weld neck collars with an extended hub for reinforced weld joints in high-pressure marine, naval and subsea piping systems.
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CuNi stub end collars — Lap Joint and Van Stone type — for flexible flange connections in marine and offshore piping networks, reducing flange cost and improving maintenance access.
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Short pattern CuNi stub end collars for economical, compact lap joint connections in process plants, marine piping transitions and cooling water systems.
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Long pattern CuNi stub end collars for systems requiring frequent disassembly in shipbuilding, offshore oil & gas, desalination and power generation.
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Complete, ready-to-install Van Stone flange assembly combining a CuNi stub end with a loose carbon steel, stainless steel or CuNi backing flange.
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CuNi 90/10 (UNS C70600) and CuNi 70/30 (UNS C71500) collars deliver unmatched performance in demanding seawater and corrosive environments across the following industries:
Sunflex Metalloy Copper-Nickel Collars are manufactured and tested in strict conformance with the following international standards. Full Mill Test Certificates (EN 10204 3.1) and PMI reports provided with every supply:
Our entire collar manufacturing process — from raw material procurement to final dispatch — is governed by ISO 9001:2015 quality management systems, ensuring consistent product quality and traceability.
We export Copper Nickel Collars to marine and offshore buyers across the USA, UK, Europe, Middle East, Southeast Asia, Australia, South Korea, Turkey and more, with packaging for international sea freight.
Every supply of CuNi collars is backed by EN 10204 3.1 Mill Test Certificates covering chemical composition, mechanical properties, dimensional inspection, hydrostatic and PMI test reports.
We manufacture collars to customer-specific drawings, special dimensions, non-standard wall thicknesses and pressure ratings. Both standard and custom-engineered configurations are available.
Our CuNi collars meet stringent naval and offshore specifications including MIL-T-16420, NAVSEA T9074, DEF STAN and NORSOK, making them suitable for the most demanding marine and defence applications.
With dedicated stock of CuNi 90/10 and CuNi 70/30 raw material, we offer competitive lead times for standard collar configurations, with faster delivery for urgent marine and offshore projects.
| Grade | UNS No. | EN / DIN Designation | Ni Content | Tensile Strength | Yield Strength | Primary Standard |
|---|---|---|---|---|---|---|
| CuNi 90/10 | C70600 | CW352H / CuNi10Fe1Mn / 2.0872 | 9 – 11% | 275 – 345 MPa | 105 MPa min | ASTM B466 / EN 12449 |
| CuNi 70/30 | C71500 | CW354H / CuNi30Mn1Fe / 2.0882 | 29 – 33% | 380 – 480 MPa | 170 MPa min | ASTM B466 / EN 12449 |
| CuNi 90/10 (Low C) | C70620 | – | 9 – 11% | 275 – 345 MPa | 105 MPa min | ASTM B466 / MIL-T-16420 |
| CuNi 70/30 (High Fe) | C71640 | – | 29 – 33% | 415 MPa min | 200 MPa min | ASTM B466 / NORSOK |
| CuNi with Cr addition | C72200 | – | 15 – 18% | 380 MPa min | 170 MPa min | ASTM B552 / NORSOK |
Get export-quality CuNi 90/10 & 70/30 collars with complete Mill Test Certificates — competitive prices & fast lead times.
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