Alloy 400
- ALLOY 400 • UNS N04400 • WNR 2.436
Alloy 400 (UNS N04400) is a solid-solution Nickel/Copper alloy that can be hardened only by cold working. It has reasonable 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 heat exchangers; and deaerating heaters.
- Available Tube Product form
- Straight
- Coiled
- Seamless
- Seam welded, cold redrawn and annealed
- 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
- Industries predominantly using this Grade
- Chemical processes
- Oil and gas
- Nuclear and Power
- Typical Manufacturing Specifications
- ASTM B163
- ASTM B165
- AMS 4574
- BS3074
- 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 | Ohm-cm |
| Density | 8.83 | g/cm3 |
Chemical Composition (% by weight)
| Element | Min | Max |
| C | - | 0.03 |
| Si | - | 0.5 |
| Mn | - | 2 |
| S | - | 0.24 |
| Cu | Balance | |
| Fe | - | 2.5 |
| Ni | 63 | 70 |
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