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UNS N07001
ISO S (heat-resistant alloys & titanium)Precipitation hardening nickel-base superalloy. Number: UNS N07001. Standard: Composition and products are specified by AMS 5544 (plate and strip), AMS 5704, 5706, 5707, 5708 and 5709 (forgings, bar and rings) and ASTM B637 (bar and forgings).
🌐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 | UNS N07001 | UNS N07001 | — | |
| JIS | — | — | Not confirmed | |
| EN | — | 2.4654 | equivalent | One source / reference[1] |
| GB | — | — | Not confirmed |
Differences between the equivalents (from the sources)
- JIS : No JIS designation corresponding to this alloy in the JIS heat-resistant superalloy standards (G 4901, G 4902) was found in primary sources. The JSA preview could not be reached during the research
- EN : Special Metals lists it as "UNS N07001/W. Nr. 2.4654". The material designation (name) was not confirmed in primary sources
- GB : The corresponding Chinese grade (some information gives GH4738) was not 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 |
|---|---|---|
| AMS 5544M | Nickel Alloy, Corrosion- and Heat-Resistant, Sheet, Strip, and Plate, 57Ni - 19.5Cr - 13.5Co - 4.2Mo - 3.0Ti - 1.4Al - 0.05Zr - 0.006B (Waspaloy), Consumable Electrode or Vacuum Induction Melted, AnnealedSheet, strip and plate. Annealed condition (revised 2026-07-21) | Agrees in 2+ sources[9][2] |
| AMS 5704L | Nickel Alloy, Corrosion and Heat Resistant, Forgings 57Ni - 19.5Cr - 13.5Co - 4.6Mo - 3.0Ti - 1.4Al - 0.05Zr - 0.006B Consumable Electrode or Vacuum Induction Melted 1825 to 1900 °F (996 to 1038 °C) Solution, Stabilization, and Precipitation Heat TreatedForgings (3.25 in. and under) and forging stock. Solution treated + stabilized + aged (revised 2020-08-03. Whether a newer edition exists is not confirmed) | Agrees in 2+ sources[10][3] |
| AMS 5706N | Nickel Alloy, Corrosion and Heat-Resistant, Bars, Forgings, and Rings 57Ni - 19.5Cr - 13.5Co - 4.3Mo - 3.0Ti - 1.4Al - 0.006B - 0.05Zr Consumable Electrode or Vacuum Induction Melted 1825 to 1900 °F Solution Heat TreatedBars, forgings, flash-welded rings and forging stock. As solution treated at 996–1038°C (revised 2020-08-04, Active on the SAE page) | Agrees in 2+ sources[11][3] |
| AMS 5707N | Nickel Alloy, Corrosion and Heat-Resistant, Bars, Forgings, and Rings 57Ni - 19.5Cr - 13.5Co - 4.3Mo - 3.0Ti - 1.4Al - 0.05Zr - 0.006B Consumable Electrode Remelted or Vacuum Induction Melted 1825 to 1900 °F (996 to 1038 °C) Solution, Stabilization, and Precipitation Heat TreatedBars, forgings and flash-welded rings (3.25 in. and under). Solution treated + stabilized + aged (revised 2017-06-13. Whether a newer edition exists is not confirmed) | Agrees in 2+ sources[12][3] |
| AMS 5708N | Nickel Alloy, Corrosion- and Heat-Resistant, Bars, Wire, Forgings, Rings, Forging, Flash-Welded Rings and Heading Stock 58Ni - 19.5Cr - 13.5Co - 4.3Mo - 3.0Ti - 1.4Al - 0.05Zr - 0.006B (Waspaloy) Consumable Electrode or Vacuum Induction Melted 1975 °F (1079 °C) Solution Heat TreatedBars, wire, forgings, rings and heading stock. As solution treated at 1079°C (revised 2024-09-11) | Agrees in 2+ sources[13][3] |
| AMS 5709K | Nickel Alloy, Corrosion- and Heat-Resistant, Bars and Forgings, 58Ni - 19.5Cr - 13.5Co - 4.3Mo - 3.0Ti - 1.4Al - 0.05Zr - 0.006B, Consumable Electrode or Vacuum Induction Melted, 1975 °F (1079 °C) Solution Heat Treated, Stabilized, and Precipitation Heat TreatedBars and forgings. Solution treated at 1079°C + stabilized + aged (revised 2025-05-03, latest in the SAE revision history) | Agrees in 2+ sources[14][3] |
| ASTM B637-26 | Standard Specification for Precipitation-Hardening and Cold Worked Nickel Alloy Bars, Forgings, and Forging Stock for Moderate or High Temperature ServiceBars, forgings and forging stock of precipitation-hardening nickel alloys (several alloys covered in one specification). Inclusion of N07001 is confirmed in Haynes and Special Metals documents (the astm.org summary page does not list UNS numbers) | Agrees in 2+ sources[15][2][1] |
All ASTM standards on Kezuriba: ASTM standards quick reference.
✈Main aerospace uses (as stated in the sources)
- Engine parts for gas turbine engines: compressor and rotor disks, shafts, spacers, seals, rings, casings, fasteners and so on. Also used in airframe assemblies and missiles (Special Metals)[1]
- Turbine and compressor disks, shafts, spacers, turbine cases and fasteners (ATI)[3]
- Widely used for wrought and fabricated gas turbine and aerospace parts, but in many applications it is being replaced by HAYNES 282 alloy (Haynes)[2]
- Used for rotating parts up to about 650°C (1200°F), and for lightly loaded parts up to about 870°C (1600°F) (Special Metals)[1]
⚗Chemical composition (mass %)
Ranges differ between specifications, so each one has its own column (dark figures agree in several sources, light figures come from one source).
| Element | Spec ① | Spec ② | Spec ③ |
|---|---|---|---|
| C | 0.02 – 0.10[1][6][7] | — | — |
| Cr | — | 18 – 21[1][6][3] | — |
| Co | — | 12 – 15[1][6][3] | — |
| Mo | — | 3.5 – 5.0[1][6][3] | — |
| Ti | — | 2.75 – 3.25[1][6][3] | — |
| Al | — | 1.2 – 1.6[1][3][7] | — |
| B | — | 0.003 – 0.010[1][3][7] | — |
| Zr | — | 0.02 – 0.12[1][6] | 0.02 – 0.08[3][7] |
| Fe | — | ≤ 2[1][6][3] | — |
| Si | — | ≤ 0.75[1][6] | ≤ 0.15[3][7] |
| Mn | — | ≤ 1[1] | ≤ 0.1[3][7] |
| P | — | ≤ 0.03[1] | ≤ 0.015[3][7] |
| S | — | ≤ 0.03[1] | ≤ 0.015[3][7] |
| Cu | — | ≤ 0.5[1] | — |
- Spec ① Composition range of UNS N07001 (Special Metals states "conforms to UNS N07001"). Carpenter and Ulbrich give the same range
- Spec ② UNS N07001 (Special Metals gives 0.003–0.01). ATI and Ulbrich give the same
- Spec ③ Manufacturer composition range (ATI, Ulbrich. Both supply AMS-grade product, but the table does not say which specification the values come from. Ulbrich labels the table "Typical")
⚖Density
8.2 g/cm³
Haynes, ATI and Ulbrich give 8.20. Special Metals gives 8.19
Calculate weight in UNS N07001 →💪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 |
|---|---|---|---|---|---|
| Specified values of AMS 5707, 5709, etc. (solution treated + stabilized + aged) | — | — | — | — | Specified value (AMS): not found. The AMS text is paywalled, and no minimum value appears on public pages or in manufacturer literature Not confirmed |
| Age hardened (996°C × 2 h air cool + 843°C × 4 h air cool + 760°C × 16 h air cool), room temperature | 1304 | 899 | 24.5 | — | Typical value (Haynes International. Product form not stated; elongation measured on 4D gauge length) One source / reference[2] |
| Solution treated + stabilized + aged (full heat treatment) | — | — | — | HRC 34–44 | Typical value range (ATI: HRC 34–44 in the full heat treatment. Special Metals: HRC 34–44 for heat treatment B, which emphasizes tensile properties, and HRC 34–40 for heat treatment A, which emphasizes creep) Agrees in 2+ sources[3][1] |
| Solution treated (annealed), thin sheet, room temperature | 909 | 419 | 52.2 | HRBW 93 | Typical value (Haynes International) One source / reference[2] |
| Solution treated (annealed), plate, room temperature | 1067 | 604 | 42.3 | HRC 29 | Typical value (Haynes International) One source / reference[2] |
1 MPa ≈ 145 psi (0.145 ksi). Hardness conversion · unit converter
🔧Machinability notes (as stated in the sources)
- Special Metals ranks Waspaloy among the harder-to-machine superalloys[1]
- According to ATI, it is hard to machine in any heat-treated condition. The condition best suited to most machining is solution treated and then partially aged, at around HRC 30. Use sharp tools and a rigid setup, and keep the depth of cut at 0.015 in. (about 0.38 mm) or more to get under the work-hardened layer. Do not raise the cutting speed too far, to avoid heat build-up and shorter tool life[3]
- ATI requires that lubricants and cutting oils (especially those containing sulfur) be removed before heat treatment or brazing, and that the attacked surface layer be machined off parts heat treated in an oxidizing or sulfur-containing atmosphere[3]
- The Haynes machining and welding brochure gives guideline values common to nickel-base and iron-base corrosion- and heat-resistant alloys. For turning with carbide tools (C-2/C-3 grades): heavy interrupted roughing 30–50 sfm (about 9–15 m/min), normal roughing 90 sfm (about 27 m/min), finishing 95–110 sfm (about 29–34 m/min) (cobalt-base alloys have different values)[8]
- Sandvik Coromant says that ISO S heat-resistant superalloys are tough and prone to built-up edge, work-harden, have poor thermal conductivity so temperatures run high, and show notch wear at the maximum depth of cut position[4]
📚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/waspoloy.pdf
- haynesintl.com https://haynesintl.com/wp-content/uploads/2024/05/waspaloy.pdf
- atimaterials.com https://www.atimaterials.com/Products/Documents/datasheets/nickel-cobalt/nickel-based/ati_…
- sandvik.coromant.com https://www.sandvik.coromant.com/en-us/knowledge/materials/workpiece-materials
- kyocera.co.jp https://www.kyocera.co.jp/prdct/tool/wp-content/uploads/2014/07/2024-2026_A.pdf
- carpentertechnology.com https://www.carpentertechnology.com/alloy-finder/waspaloy
- ulbrich.com https://www.ulbrich.com/uploads/data-sheets/Waspaloy%C2%AE-Wire-UNS-N07001.pdf
- haynesintl.com https://haynesintl.com/wp-content/uploads/2024/08/Fabrication-and-Welding-Brochure.pdf
- saemobilus.sae.org https://saemobilus.sae.org/content/AMS5544M
- saemobilus.sae.org https://saemobilus.sae.org/content/ams5704l
- saemobilus.sae.org https://saemobilus.sae.org/content/AMS5706N
- saemobilus.sae.org https://saemobilus.sae.org/content/AMS5707N
- saemobilus.sae.org https://saemobilus.sae.org/content/AMS5708N
- saemobilus.sae.org https://saemobilus.sae.org/content/AMS5709K
- store.astm.org https://store.astm.org/b0637-26.html
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