QQ-N-281 Specifications & Applications

Stoke-on-Trent, United Kingdom
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UK +44 (0) 1782 816888 | US +1 17577921977

QQ-N-281 Overview

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

Its ability to maintain properties at sub-zero and elevated temperatures up to 450°C (842°F) providing it does not encounter 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
ASTM B164

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QQ-N-281 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 a higher-spec alloy with longer-lasting performance and durability, consider CNC-1® or T-1000.

Discover CNC-1®

Discover T-1000

Key features of QQ-N-281

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.

Applications of QQ-N-281

QQ-N-281 is suited for use in:

Chemical and hydrocarbon processing components
Heat exchangers
Valve and pump components
Fasteners and bolts

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Typical Mechanical Properties

	Ultimate Tensile	Yield Strength (0.2% OS)	Elong. in 2in. or 50mm (or 4D), min., %
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.

Frequently Asked Questions

What are the typical applications of QQ-N-281 alloy?

Due to its high strength and excellent corrosion resistance to acids and alkalis, it typically finds application in marine engineering, chemical and hydro-carbon processing, heat exchangers, valves and pumps.

Can QQ-N-281 be welded?

Yes, QQ-N-281 can be welded using welding techniques such as SMAW, GMAW, GTAW and plasma arc welding.

Where can I buy QQ-N-281 metal alloy?

You can order QQ-N-281 in various formats, such as rod, bars, rings, discs, forgings, blocks, plate, sheet and customised shapes, from us at Copper Alloys. Simply get in touch to discuss your requirements with our metallurgists.

Copper Alloys can 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’ technical team on +44 (0) 1782-816888, or email us.

Contact the technical team

This Data is indicative only and must not be seen as a substitute for the full specification from which it is drawn. In particular, the mechanical property requirements vary widely with temperature, product and product dimensions. The information is based on our present knowledge and is given in good faith. However, no liability will be accepted by the Company in respect of any action taken by any third party in reliance thereon.

As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose.

Any advice given by the Company to any third party is given for that party’s assistance only and without liability on the part of the Company. Any contract between the Company and a customer will be subject to the Company’s Conditions of Sale. The extent of the Company’s liabilities to any customer is clearly set out in those Conditions, a copy of which is available on request.