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Alloy 400

A nickel-copper grade, Alloy 400 combines high strength and corrosion resistance.

Superb corrosion resistance in a wide range of media including seawater, hydroflouric acid, fluorine, sulphuric acid and alkalis.


Product Form Size range from Size range to
Alloy 400 round bar 4.76 mm 279 mm
Alloy 400 round tubing 3.175 mm 19.05 mm
Alloy 400 sheet & plate 0.5 mm 76.2 mm
Alloy 400 pipe 0.25 in 8 in
Alloy 400 pipe fittings 0.25 in 8 in
Alloy 400 flanges 0.25 in 8 in

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    Pipe Fittings

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    Sheet & Plate

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    Round Bar

Chemical Analysis

% C Si Mn S Fe Ni Cu
Min 0 0 0 0 0 63 28
Max 0.3 0.5 2 0.024 2.5 70 34


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Perfect for applications in the Chemical Processing Industry

Alloy 400 can be used in a variety of applications including:

  • Packed columns
  • Pressure vessels and reactors
  • Brine heaters
  • Heat exchangers
  • Salt production equipment
  • Pump and valve components
  • Pipe work and pipe spools

About Alloy 400

Alloy 400 from NeoNickel has superb corrosion resistance, particularly in neutral and alkaline salts. It is also one of a limited number of alloys that can be used in conjunction with hydrofluoric acid and fluorine. With high nickel content, this alloy is immune to chloride-induced stress corrosion cracking. The alloy also has good mechanical properties from sub-zero temperatures up to 549°C.

This alloy also performs excellently in seawater, with improved resistance to cavitation corrosion compared with other copper-base alloys. It’s often used to handle sulphuric acid up to 80% concentration at room temperature and up to 15% sulphuric acid at boiling temperatures.

Check out our Technical Resource: Burst Pressure Tables using Alloy 400 Seamless Tube.



8.80 g/cm³
Melting Range:
1300 - 1350 °C
60-80 HRB
Specific Heat Capacity:
427 J/kg.°C
Electrical Resistivity:
0.511 µΩ.m
Curie Temperature:
Poisson's Transus:


UNS Number:
Werkstoff Number:
ASTM B127, B163, B164, B165, B564, B725, B730, B366, AMS 4675, 4730, AMS 4544, 4731
Download the Alloy 400 Data Sheet Download

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