Alloy 400 (UNS N04400) is a solid-solution alloy that can be hardened only by cold working. It has high strength and toughness over a wide temperature range and excellent resistance to many corrosive environments.
Alloy 400 is widely used in many fields, especially marine and chemical processing. Typical applications are valves and pumps; pump and propeller shafts; marine fixtures and fasteners; electrical and electronic components; springs; chemical processing equipment; gasoline and fresh water tanks; crude petroleum stills, process vessels and piping; boiler feedwater heaters and other eat exchangers; and deaerating heaters.
Available tube product forms
Typical Applications
- Heat exchangers
- Steam Generators
- Reboiler tubes
- Nuclear core cooling tubes
- Brine heaters and evaporator bodies in salt plant
- Sulphuric and hydrofluric acid alkylation plant acids
- Control lines
Typical manufacturing specifications
- ASTM B163
- ASTM B165
- AMS 4574
- BS3074
Industries predominantly using this grade
Technical Data
Mechanical Properties
| Temper |
Annealed |
| Tensile Rm |
70 |
ksi (min) |
| Tensile Rm |
480 |
MPa (min) |
| R.p. 0.2% Yield |
28 |
ksi (min) |
| R.p. 0.2% Yield |
195 |
MPa (min) |
| Elongation (2” or 4D gl) |
40 |
% (min) |
Physical Properties (Room Temperature)
| Specific Heat (0-100°C) |
427 |
J.kg-1.°K-1 |
| Thermal Conductivity |
21.8 |
W.m -1.°K-1 |
| Thermal Expansion |
13.9 |
μm/μm/°C |
| Modulus Elasticity |
173 |
GPa |
| Electrical Resistivity |
5.47 |
μohm/cm |
| Density |
8.83 |
g/cm3 |
Chemical Composition (% by weight)
| Element |
Min |
Max |
| C |
- |
0.3 |
| Si |
- |
0.5 |
| Mn |
- |
2 |
| S |
- |
0.24 |
| Cu |
Balance |
| Fe |
- |
2.5 |
| Ni |
63 |
70 |