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Data Sheets

Nickel Alloy

Cupro-Nickel (Copper-Nickel)

Alloy 400

Alloy 400 is a ductile, nickel-copper based alloy comprised essentially of two-thirds nickel and one third copper. Alloy 400 is known for resistance to a variety of corrosive conditions, including alkalies (or acid like substances), saltwater, hydrofluoric acid and sulphuric acid. Other advantages of using this alloy are its toughness and high strength over a broad temperature range; it can also be manipulated to become magnetic if desired.

This alloy is supplied:
Hot worked and annealed over 55mm diameter.
Cold worked and stress-relieved up to 55mm diameter.

Bars 3/4 inch to 4 inch diameter are supplied with 3.2 Certification.

Bars are UT tested to DEF STAN 02-729

All bars are of European Origin.

Chemical Composition

ASTM B164-03 (2014)
Alloy 400
Chemical Element % Present
Copper (Cu) 28.00 - 34.00
Carbon (C) 0.0 - 0.30
Iron (Fe) 0.0 - 2.50
Manganese (Mn) 0.0 - 2.00
Silicon (Si) 0.0 - 0.50
Sulphur (S) 0.0 - 0.02
Nickel (Ni) Balance

Alloy Designations

ASTM B164-03 (2014) / UNS NO4400

BS3076 NA13

NACE MR0175/0103

Generic Physical Properties

Physical Property Value
Density 8.82 g/cm³
Melting Point 1300-1350 °C
Modulus of Elasticity 182 GPa
Thermal Conductivity 23.0 W/m.K
Room temperature Physical Properties are shown (20C) and most vary as temperature changes.

Mechanical Properties

ASTM B164-03 (2014)
Round Bar - Hot Worked, Annealed -
Mechanical Property Value
Proof Stress 170 Min MPa
Tensile Strength 480 Min MPa
Elongation A50 mm 35 Min %
ASTM B164-03 (2014)
Round Bar - Cold Worked/Stress Relieved - Under 12.7mm Dia
Mechanical Property Value
Proof Stress 345 Min MPa
Tensile Strength 580 Min MPa
Elongation A50 mm 10 Min %
ASTM B164-03 (2014)
Round Bar - Cold Worked/Stress relieved - 12.7mm to 88.9mm Dia
Mechanical Property Value
Proof Stress 415 Min MPa
Tensile Strength 600 Min MPa
Elongation A50 mm 20 Min %
ASTM B164-03 (2014)
Round Bar - Cold Worked/Stress relieved - 88.9mm to 101.6mm Dia
Mechanical Property Value
Proof Stress 380 Min MPa
Tensile Strength 580 Min MPa
Elongation A50 mm 20 Min %


Excellent corrosion resistance

High strength and hardness

Broad temperature range

Easily processed and machined


Pump and valve components

Electrical components

Marine hardware and fixtures


Heat exchangers


This Data is indicative only and as such is not to be relied upon in place of the full specification. In particular, mechanical property requirements vary widely with temper, product and product dimensions. All information is based on our present knowledge and is given in good faith. No liability will be accepted by the Company in respect of any action taken by any third party in reliance thereon.

Please note that the 'Datasheet Update' date shown above is no guarantee of accuracy or whether the datasheet is up to date.

The information provided in this datasheet has been drawn from various recognised sources, including EN Standards, recognised industry references (printed & online) and manufacturers’ data. No guarantee is given that the information is from the latest issue of those sources or about the accuracy of those sources.

Material supplied by the Company may vary significantly from this data, but will conform to all relevant and applicable standards.

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, whether expressed or implied.

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. All transactions are subject to the Company’s current 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.