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.

  • UNS Number: N04400
  • Werkstoff Number: 2.4630
  • ASTM: B127, B163, B164, B165, B564, B725, B730, B366, 4730, 4731
  • AMS: 4675, 4544

Product availability

Pipe (Seamless)
Pipe Fittings
Round Bar
Round Tube

Chemical analysis



  • 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.

  • Density: 8.80 g/cm³
  • Melting Range: 1300 - 1350 °C
  • Hardness: 60-80 HRB
  • Specific Heat Capacity: 427 J/kg.°C
  • Electrical Resistivity: 0.511 µΩ.m
  • Curie Temperature: 21-49°C
  • Poisson's Transus: 0.32

Mechanical & Physical Properties

Mechanical & Physical Properties-180°C-130°C-70°C21.1°C93.3°C204.4°C315.6371.1°C426.7°C537.8°C648.9°C982°C
Ultimate Tensile Strength /MPa---450420390380370370---
0.2% Yield Strength /MPa---175150135130130130---
Reduction of area %------------
Elongation %---51444347-4838--
Coefficient of Thermal Expansion /µm/m°C11.111.412.1-
Thermal Conductivity /kcal/(hr.m.°C)14.1915.6517.0318.9220.6423.1325.8928.72-31.3933.88-
Proud members of the British Valve & Actuator AssociationProud members of the British Valve & Actuator Association