Special Nickel-Copper
NiCu30

QQ-N-281 (based on Nickel 400) is a single phase nickel-copper alloy, with high strength and very good corrosion resitance in salt and brackish waters. The alloy can also be cold worked to increase the mechancical properties.

Its ability to maintain properties at sub zero and elivated temperatures up to 450°C (842°F) providing it does not come into contact with sulphur bearing gases above 371°C (700°F), enables it to be used in a wide spectrum of applications.

The alloy performs well in reducing acids such as sulphuric and hydrochloric providing there is no aeration or other oxidising media present.

QQ-N-281 shows high strength and excellent corrosion resistance in a range of acidic and alkaline environments and it’s especially suitable for reducing conditions. It also has good ductility and thermal conductivity. It typically finds application in marine engineering, chemical and hydro-carbon processing, heat exchangers, valves and pumps.

QQ-N-281 is covered by the following standard designations: BS 3075, 3076 NA 13, DTD 204B and ASTM B164.

Typical Mechanical Properties

Ultimate Tensile Yield Strength (0.2% OS) Elong. in 2in. or 50mm (or 4D), min., % R/A Hardness
Cold worked/SR
Min 87 KSi 60 KSi 20B
Max
Min 600 MPa 415 MPa
Max
Hot worked/SR
Min 80 KSi 40 KSi 30D
Max
Min 552 MPa 276 MPa
Max

B – not applicable to diameters or cross sections under 3/32 in. (2.4mm).
D – for hot-worked flats 5/16 in. (7.9mm) and under in thickness the elongation shall be 20% min.

 

Equivalent Specifications

This is a US Federal Material Specification based upon the UNS (Unified Numbering System) N04400. QQ-N-281 is a single phase moderate strength, corrosion resistant nickel alloy widely used in naval applications. This alloy is resistant to hydrofluoric acid and stress corrosion pitting/cracking.

If you’re looking for higher-spec alloys with longer-lasting performance and durability consider CNC-1 or T-1000.

Key Features

Available in a wide range of formats, conditions and tempers, properties can be modified to suit specific applications and environments. Typical formats include rod, bars, rings, discs, forgings, blocks, plate, sheet and customised shapes. Cold worked and tempered grades are also available.

Typical Uses

Chemical and hydrocarbon processing components, heat exchangers, valve and pump components, fasteners and bolts.

Description
Nominal Composition NiCu30
Alloy Type wrought

Copper Alloys has the ability to modify existing alloys for improved performance. Many customers have benefited from this in the past.

To discuss your requirements, call a member of Copper Alloys’s technical team on +44 (0) 1782-816888, or email [email protected].

Contact

+44 (0) 1782 816888

[email protected]

Auckland Street, Stoke-on-Trent, ST6 2AZ, United Kingdom