Wst. 2.4360

UNS N04400

Stock program:
3 – 25 mm OD
1/16” – 1.1/2” OD

ASTM B 163/ASME SB 163
ASTM B 165/ASME SB 165
EN 10216-5/EN ISO 1127
NACE MR0175/PED 97/23 EC

Maximum expose temperature: 425°C / 772°F

Alloy 400 is a nickel-copper alloy (approx. 67% Ni – 23% Cu) that is resistant to seawater and steam at high temperatures as well as to salt and caustic solutions. It is a solid-solution alloy that can be hardened only by cold working. It’s wide used in marine applications and other nox-oxidizing chloride solutions. This nickel alloy is particularly resistant to hydrochloric and hydrofluoric acids when they are de-aerated. As would be expected from its high copper content, alloy 400 is rapidly attacked by nitric acid and ammonia systems.


  •     Resistance to seawater and steam at high temperatures
  •     Excellent resistance to many corrosive environments
  •     High strength and toughness over a wide temperature range
  •     Particularly resistant to stress corrosion cracking
  •     High resistance to alkalis and alkaline salt

Market applications:

  •    Marine engineering
  •    Chemical and hydrocarbon processing equipment
  •    Steam generators
  •    Heat exchanges
  •    Control lines

Technical details

Technical composition (%) Fe Ni Mn Cu Si C S
400 min 63 28
max 2.5 70 2.0 40 0.5 0.3 0.024
Mechanical properties 400
Tensile strenght (mpa, min) nl 480
Yield strength (0.2% offset mpa, min) 195
Elongation (%, min) 40
Density / weight (g / cm3 / kg) 8.83