UNS C70600 Copper Nickel Flange | Copper Nickel 90/10 ASME B16.5 Flange

What Is UNS C70600 Copper Nickel Flange?

UNS C70600 copper nickel flange, also known as Copper Nickel 90/10 flange (CuNi 90/10), is a corrosion-resistant pipe flange widely used in seawater and marine piping systems.

Manufactured according to ASME B16.5 dimensional standards and EEMUA 145 specifications, C70600 flanges are designed for offshore, shipbuilding, desalination plants, and seawater cooling systems.

Copper nickel 90/10 alloy contains approximately 90% copper and 10% nickel, with small additions of iron and manganese to improve resistance to seawater corrosion, erosion, and biofouling.

Because of these excellent properties, UNS C70600 flanges are commonly used in marine engineering and offshore oil & gas pipelines.

Standards for Copper Nickel 90/10 Flanges

Copper nickel flanges are manufactured according to international piping standards including:

• ASME B16.5 – Pipe flanges and flanged fittings

• EEMUA 145 – Copper nickel alloy piping systems for seawater service

• ASTM B151 – Copper nickel pipe material standard

• ASTM B171 – Copper nickel plate and sheet

Material designation:

• UNS C70600

• CuNi10Fe1Mn

• Copper Nickel 90/10

C70600 Copper Nickel Flange Specifications

DIN Standard Copper Nickel Flanges

DIN standard flanges are most common standard in shipbuilding.

• DIN 86037 Composite Weld Neck Flanges
• DIN 86036 Composite Slip On Flanges
• DIN 86033 Copper Nickel Slip On Flanges
• DIN 2632/2633 Copper Nickel Weld Neck Flanges

The pressure rate in DIN is 10 bar and 14 bar. Material: it can be named as CW352h and Cuni10fe1.6mn. It is one of the copper nickel alloy. The DIN standard material requirement like tolerance is stricter than other standards.

EEMUA 145 Standard Copper Nickel 7060X Flanges

EEMUA 145 standard copper-nickel flanges are normally used on the marine and offshore structure. There are four main styles as below:

• Composite Weld Neck Flanges
• Composite Slip On Flanges
• Copper Nickel Slip On Flanges
• Copper Nickel Weld Neck Flanges

The pressure rate in DIN is 16 bar and 20 bar. Material: it can be named as UNS 7060X

ASME B16.5 Copper Nickel C70600 Flanges

ASME B16.5 standard C70600 flanges are mainly used on the oil field. There are 5 main flange type as below:

• Copper Nickel Weld Neck Flanges
• Copper Nickel Slip On Flanges
• Copper Nickel Socket Weld Flanges
• Copper Nickel Threaded Flanges
• Copper Nickel Blind Flanges

The pressure rate in copper nickel field are : Class 150 and Class 300 Thickness: Sch5s, Sch10s, Sch40s, Sch80s. Material: ASTM B151 UNS C70600 / ASTM B151 UNS C71500

EEMUA 234 This First Edition, released in November 2015, replaces the combined and updated EEMUA Publications 144, 145 and 146, which have now been withdrawn. The new publication covers tubes (seamless and welded) for use in cooling and fire-fighting sea water service on offshore platforms, slip-on flanges (composite and solid), and fittings, including butt welding, socket welding, capillary brazing, compression, threaded, branch and saddle pieces. EEMUA Publication 234 has been fully updated to comply with current standards.

Chemical Composition of UNS C70600

The nickel and iron content provides excellent resistance to seawater corrosion and biofouling.

Key Properties of Copper Nickel 90/10 Flanges

UNS C70600 copper nickel flanges provide several advantages:

• Excellent resistance to seawater corrosion

• High resistance to erosion in flowing seawater

• Good resistance to biofouling and marine growth

• Long service life in marine environments

• Excellent thermal conductivity

These characteristics make CuNi 90/10 flanges ideal for marine and offshore piping systems.

Applications of UNS C70600 Copper Nickel Flanges

Copper nickel 90/10 flanges are widely used in industries exposed to seawater or corrosive marine environments.

Typical applications include:

Offshore Oil and Gas

• Offshore platforms

• Subsea pipelines

• Seawater cooling systems

Shipbuilding and Marine Engineering

• Ship piping systems

• Ballast water systems

• Firefighting seawater pipelines

Desalination Plants

• Seawater intake pipelines

• Reverse osmosis systems

Power Plants

• Seawater condensers

• Heat exchanger pipelines

EEMUA 145 Copper Nickel Flanges

EEMUA 145 provides guidelines for copper nickel piping systems used in seawater service.

Under this specification, C70600 copper nickel flanges must meet strict requirements for:

• corrosion resistance

• mechanical strength

• dimensional accuracy

• welding compatibility

These flanges are commonly used together with CuNi 90/10 pipes, elbows, tees, and reducers in marine piping systems.