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  • TOBO STEEL GROUP CHINA
    Brazil---Aimee
    In the latest vendor rating, TOBO won the excellent rating, it is good, will continue to cooperate.
  • TOBO STEEL GROUP CHINA
    Thailand ---Dave Mulroy
    ASTM A213 T9 Alloy steel pipe ,Stable quality , good price, excellent serive, TOBO GROUP is our trustworthy partner .
  • TOBO STEEL GROUP CHINA
    USA ---Alfaro
    ASTM A182 F55 Super Duplex Flange ,Good quality , we like that ! And delivery time in time also ,very professional.
Contact Person : Joy Wang
Phone Number : 0086-21-31261985
WhatsApp : +8613524668060

Copper Nickel CuNi 90/10 Lap Joint Stub Ends Marine

  • Copper Nickel CuNi 90/10 Lap Joint Stub Ends Marine
  • Copper Nickel CuNi 90/10 Lap Joint Stub Ends Marine
  • Copper Nickel CuNi 90/10 Lap Joint Stub Ends Marine
  • Copper Nickel CuNi 90/10 Lap Joint Stub Ends Marine
  • Copper Nickel CuNi 90/10 Lap Joint Stub Ends Marine
Place of Origin China
Brand Name Tobo
Certification ISO 9001:2015, ABS, DNV, BV
Model Number CUNI-STUBEND-9010
Minimum Order Quantity 1 Piece
Price USD 8-120 / Piece (Depends on material and size)
Packaging Details Plywood cases or wooden pallets with waterproof wrapping, export standard
Delivery Time 15-40 days depending on quantity
Payment Terms L/C,T/T,Western Union
Supply Ability 10,000 Pieces per Month
Product Details
Product Name Copper Nickel CuNi 90/10 Lap Joint Stub Ends Application Marine And Offshore Piping
Material Grade CuNi 90/10 (C70600), CuNi 70/30 (C71500) Standard MSS SP-43, ASTM B171, DIN 86037
Size Range 1/2 Inch To 36 Inch Wall Thickness Sch10S To Sch80
Corrosion Resistance Excellent Seawater Corrosion Resistance Connection Type Butt Weld
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Copper Nickel Stub End

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CuNi 90/10 Alloy

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Marine Pipe Fittings
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Product Description
Copper Nickel CuNi 90/10 Lap Joint Stub Ends Marine
Product Overview

The Copper Nickel CuNi 90/10 Lap Joint Stub Ends are premium marine grade pipe fittings engineered specifically for seawater and offshore piping systems. Manufactured to MSS SP-43 with reference to ASTM B171 and DIN 86037, these copper nickel stub ends offer outstanding resistance to seawater corrosion, biofouling and erosion, making them the industry standard choice for shipbuilding and offshore platforms.

Available in CuNi 90/10 (C70600) and CuNi 70/30 (C71500), our lap joint stub ends combine proven alloy performance with precision manufacturing. The copper nickel alloy forms a protective surface film in seawater that self-heals when damaged, providing long-term reliability unmatched by ordinary stainless steel in marine environments. Each fitting is produced with full traceability and can be supplied with ABS, DNV or BV classification certificates for marine class projects.

Specifications
Standard MSS SP-43, ASTM B171, DIN 86037
Material Grade CuNi 90/10 (C70600), CuNi 70/30 (C71500)
Size Range 1/2 Inch to 36 Inch
Wall Thickness Sch10S to Sch80
Connection Type Butt Weld
Type Long Type, Short Type
Surface Finish Machined, Descaled
Classification ABS, DNV, BV Available
Certification ISO 9001:2015
Key Features
  • CuNi 90/10 and 70/30 alloys provide superior seawater corrosion resistance
  • Self-healing protective film resists biofouling and erosion in marine service
  • Proven performance in shipbuilding, offshore and desalination applications
  • MSS SP-43 dimensional accuracy ensures reliable flange connections
  • Suitable for high velocity seawater flow with minimal erosion
  • Classification certificates from ABS, DNV or BV available on request
  • Full material traceability with EN 10204 3.1 certificates
Applications
  • Shipboard seawater cooling and firefighting systems
  • Offshore platform piping and riser systems
  • Desalination plant piping
  • Coastal power plant cooling water lines
  • Marine heat exchangers and condensers
Quality Assurance

Copper nickel alloys are subject to strict quality control due to their critical marine applications. We source CuNi 90/10 and CuNi 70/30 raw materials from certified mills and verify composition through spectrometric analysis. Production follows approved welding and forming procedures, and each fitting is pressure tested and dimensionally inspected.

For marine class projects, we coordinate with classification societies including ABS, DNV and BV to perform witnessed inspections and issue class certificates. Our team has supplied copper nickel fittings to shipyards and offshore contractors for over 15 years, building a track record of reliable marine piping solutions.

Frequently Asked Questions
Q1: Why is copper nickel preferred for seawater piping?

A: Copper nickel alloys such as CuNi 90/10 naturally form a protective, self-healing surface film in seawater. This film resists corrosion, biofouling and erosion, giving copper nickel stub ends a service life measured in decades for marine applications.

Q2: What is the difference between CuNi 90/10 and CuNi 70/30?

A: CuNi 90/10 (C70600) contains 90% copper and 10% nickel, offering the best balance of corrosion resistance and cost. CuNi 70/30 (C71500) contains 30% nickel, providing higher strength and better resistance to aggressive conditions such as polluted seawater.

Q3: Can you supply classification society certificates?

A: Yes. We can arrange ABS, DNV, BV or LR classification inspection and certification for marine grade stub ends, including material certificates and witnessed pressure tests.

Q4: What sizes are available for marine stub ends?

A: We supply copper nickel lap joint stub ends from 1/2 inch up to 36 inches, with wall thickness from Sch10S to Sch80. Larger sizes can be produced on request for special projects.

Tags:

Stub End Fittings

Lap Joint Stub End

SS Stub End