NAS NW400； High Corrosion Resistant Ni-Cu Alloy
Characteristics of NAS NW400
An alloy including copper and nickel, NAS NW400 (NW 4400, UNS N04400), comparable to Alloy 400, shares in the noble properties of copper and passivation of nickel to provide excellent corrosion resistance. It is therefore used in seawater desalination systems, heat exchangers and marine structure jackets.
Chemical Composition
(%)
| - | C | Si | Mn | S | Ni | Cr | Fe |
| JIS H 4551 NW4400 |
≦0.30 | ≦0.5 | ≦2.0 | ≦0.025 | ≧63.0 | 28.0～34.0 | ≦2.5 |
| NAS NW400 | 0.1 | 0.1 | 1.0 | 0.01 | 65 | 31 | 1.5 |
Corresponding Standard
Corresponding standards are as follows;
JIS H 4551 / NW4400
ASTM B 127 / UNS N04400
ASME SB-127 / UNS N04400
AMS 4544
Mechanical Properties
| Heat treatment | 0.2% Proof stress （N/mm2） |
Tensile strength （N/mm2） |
Elongation （％） |
Hardness （HV） |
|
| JIS H 4551 NW4400 |
Annealed | ≧195 | ≧480 | ≧35 | - |
| NAS NW400 (12 mm thick) |
Annealed | 209 | 513 | 52 | 131 |
Work Hardening Behavior
NAS NW400 is far less hard than Type 301 and Type 304, making bending and other such processes easy to perform.
