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Grade |
Cu |
Fe |
Mn |
C |
Si |
S |
N04400 |
28.0-34.0 |
≤2.5 |
≤2.0 |
≤0.3 |
≤0.5 |
≤0.024 |
Grade |
Condition |
Tensile Strength ksi(MPa) |
Yield Strength ksi(MPa) |
Elongation(%) |
N04400 |
Annealed |
≥70(483) |
≥28(193) |
≥35 |
N04400 |
Stress-relieved |
≥85(586) |
≥55(378) |
≥15 |
Alloy 400 is one of the most widely used materials for marine applications, shipbuilding and seawater desalination plants. The alloy exhibits very low rates of corrosion in flowing sea or brackish water. However, under stagnant conditions, the alloy can encounter crevice and pitting corrosion. Alloy 400 resists stress corrosion cracking and pitting in most fresh and industrial water applications.
This alloy has excellent resistance to rapidly flowing and warm seawater, brackish water, and steam. It is particularly resistant to hydrochloric and hydrofluoric acids when they are de-aerated. This alloy is slightly magnetic at room temperature. Alloy 400 is widely used in the chemical, oil, and marine engineering industries. For the more machinable variant, please see alloy R405.