Printed from Kezuriba (kezuriba.net/en/materials/alloy400/)
Alloy 400
ISO group: not confirmedNickel-copper alloy (solid solution type. Hardens only by cold working). Number: UNS N04400. Standard: Composition and products are specified by ASTM B127 (plate and strip), ASTM B164 (rod and wire), AMS 4544 (plate and strip), AMS 4675 (bar and forgings), JIS G 4902 NW4400 (plate and strip), etc..
🌐JIS and international equivalents
“Close” means composition or properties are not exactly the same. Before substituting, check the values in each standard.
| System | Designation | Number | Relation | Confidence |
|---|---|---|---|---|
| UNS | Alloy 400 | UNS N04400 | — | |
| JIS | NW4400 | JIS G 4902 (Corrosion-resisting and heat-resisting superalloy, nickel and nickel alloy - Plates, sheets and strips) | equivalent | One source / reference[2] |
| EN | NiCu30Fe | 2.4360 | close | Agrees in 2+ sources[3][1] |
| GB | — | — | Not confirmed |
Differences between the equivalents (from the sources)
- JIS NW4400: Nippon Yakin Kogyo's catalog maps NASNW400 to JIS G 4902 NW4400 and ASTM B127 UNS N04400, and in its composition table the NW4400 and UNS N04400 ranges are the same (differing only in the number of digits). The former standard was JIS H 4551, which was merged into JIS G 4902 in 2019; this was seen in a JSA search result, but the JSA site would not connect during the investigation and the text was not confirmed. The JIS standard for bar is not confirmed
- EN NiCu30Fe: VDM lists EN 2.4360 - NiCu30Fe and UNS N04400 together. Special Metals lists W.Nr. 2.4360 and 2.4361 together. VDM's composition (EN) is Fe 1–2.5, C≤0.15, Al≤0.5, which differs from UNS N04400 (Fe≤2.5, C≤0.3, no Al requirement). VDM gives the ISO symbol as NiCu30
- GB : Information gives the corresponding Chinese grade as NCu30 in GB/T 5235, but this could not be confirmed in primary sources
📄Related specifications (AMS, ASTM etc.)
Specifications called up on purchase orders and drawings. AMS are SAE aerospace material specifications, split by product form (bar, plate, forging), melting practice and heat treatment. Standard texts are paid, so only titles and scopes checked on the publishers’ public pages are shown.
| Spec | Scope | Confidence |
|---|---|---|
| ASTM B127-25 | Standard Specification for Nickel-Copper Alloy Plate, Sheet, and StripRolled plate, sheet and strip (UNS N04400) | Agrees in 2+ sources[4][1] |
| ASTM B164-26 | Standard Specification for Nickel-Copper Alloy Rod, Bar, and WireHot- and cold-worked round bar, square bar and wire (UNS N04400 and N04405) | Agrees in 2+ sources[5][1] |
| AMS 4544J | Nickel-Copper Alloy, Corrosion-Resistant, Sheet, Strip, and Plate 67Ni - 30Cu AnnealedSheet, strip and plate. Annealed (revised 2022-08-26) | Agrees in 2+ sources[6][1] |
| AMS 4675F | Nickel-Copper Alloy, Corrosion-Resistant, Bars and Forgings 67Ni - 30CuBar (diameter or across flats 0.093–4.000 in) and forgings and stock for forging (revised 2022-10-26) | Agrees in 2+ sources[7][1] |
| AMS 7233D | RIVETS, SOLID, ALLOY, CORROSION RESISTANT 67Ni - 31CuSolid rivets (revision D of 1991-01-01. Shown as latest on SAE Mobilus) | One source / reference[8][1] |
All ASTM standards on Kezuriba: ASTM standards quick reference.
✈Main aerospace uses (as stated in the sources)
- Special Metals lists AMS 4544 (plate), AMS 4675 (bar and forgings), AMS 4574 (seamless tube), AMS 4730 and 4731 (wire), AMS 7233 (rivets) and AECMA PrEN 2305 (wire for rivets) as aerospace material standards. The same document's description of applications centers on ships, chemical plants and heat exchangers, with no mention of named aircraft parts[1]
⚗Chemical composition (mass %)
As specified in UNS N04400 (Special Metals' Limiting Chemical Composition gives "Ni (including Co) 63.0 min". Nippon Yakin Kogyo's "Specification (UNS N04400)" also gives 63.0 min)
⚖Density
8.8 g/cm³
Special Metals and Nippon Yakin Kogyo give 8.80. VDM (EN 2.4360) gives 8.82
Calculate weight in Alloy 400 →💪Mechanical properties
“Reference” values are not specified minimums from the standard but figures published by makers and others.
| Condition | Tensile MPa | Yield MPa | Elong. % | Hardness | Type of value |
|---|---|---|---|---|---|
| Plate and strip, annealed (JIS G 4902 NW4400) | ≥ 485 | ≥ 195 | ≥ 35 | — | Specified value (JIS. Listed in Nippon Yakin Kogyo NASNW400 catalog) One source / reference[2] |
| Hot-rolled plate, annealed (UNS N04400. Nippon Yakin Kogyo's table corresponds to ASTM B127) | ≥ 485 | ≥ 195 | ≥ 35 | — | Specified value (UNS N04400. Listed in Nippon Yakin Kogyo catalog) One source / reference[2][3] |
| Cold-rolled plate, annealed (UNS N04400) | 485–585 | ≥ 195 | ≥ 35 | — | Specified value (UNS N04400. Listed in Nippon Yakin Kogyo catalog) One source / reference[2] |
| Plate and bar, annealed (DIN and VdTÜV 263. Plate 50mm or less, bar 200mm or less) | ≥ 450 | ≥ 175 | ≥ 30 | — | Specified value (DIN and VdTÜV. Listed in VDM datasheet). Only the impact value is an average value One source / reference[3] |
| Bar, annealed, room temperature | 517–620 | 172–345 | 60–35 | HB 110–149 (3000kg) / HRB 60–80 | Range of nominal values (Special Metals. A range combining products of different sizes; noted as not usable for specifications) One source / reference[1] |
| Plate, hot-rolled and annealed, room temperature | 482–586 | 193–345 | 50–35 | HB 110–140 (3000kg) / HRB 60–76 | Range of nominal values (Special Metals. Noted as not usable for specifications) One source / reference[1] |
| Hot-rolled plate 12mm, annealed, room temperature | 513 | 209 | 52 | HV 131 | Measured example (Nippon Yakin Kogyo NASNW400) One source / reference[2] |
1 MPa ≈ 145 psi (0.145 ksi). Hardness conversion · unit converter
🔧Machinability notes (as stated in the sources)
- According to Special Metals, it can be machined at sufficient productivity on ordinary machine tools. Cold-drawn material, or material stress relieved after cold drawing, is easiest to machine and gives the best surface finish. MONEL alloy R-405 is available as a free-machining version[1]
- According to VDM, it machines easily even in the annealed (soft) condition, but for many operations, work-hardened and stress-relieved material is easier to handle. Because it work hardens readily, use a lower cutting speed and keep the tool continuously engaged. It is important to cut deeper than the layer hardened by the previous pass. Use plenty of water-soluble cutting fluid to carry away heat[3]
- Nippon Yakin Kogyo states that work hardening is considerably smaller than SUS301 and SUS304 and room-temperature strength is also lower than SUS304, so cold working such as bending is easy (a statement about plastic forming)[2]
📚Sources
Primary sources (public documents from makers, industry associations and standards bodies), numbered where each value is cited. Many are in Japanese.
- specialmetals.com https://www.specialmetals.com/documents/technical-bulletins/monel-alloy-400.pdf
- nyk.co.jp https://www.nyk.co.jp/en/pdf/products/NAS_NW400_E.pdf
- vdm-metals.com https://www.vdm-metals.com/fileadmin/user_upload/Downloads/Data_Sheets/Data_Sheet_VDM_Allo…
- store.astm.org https://store.astm.org/b0127-25.html
- store.astm.org https://store.astm.org/b0164-26.html
- saemobilus.sae.org https://saemobilus.sae.org/content/AMS4544J
- saemobilus.sae.org https://saemobilus.sae.org/content/AMS4675F
- saemobilus.sae.org https://saemobilus.sae.org/content/AMS7233
Other materials
Nickel alloy