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A286
ISO S (heat-resistant alloys & titanium)Iron-base heat-resistant alloy (precipitation-hardening austenitic). Number: UNS S66286. Standard: AMS 5525, 5731, 5732, 5737, 5858 (SAE); ASTM A453/A453M Grade 660 and ASTM A638/A638M Grade 660. The manufacturers (ATI, Carpenter) show them as corresponding to these standards.
🌐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 | A286 | UNS S66286 | — | |
| JIS | SUH660 | JIS G 4311 (bar) / G 4312 (plate and sheet) | close | Agrees in 2+ sources[8][9][10] |
| EN | X6NiCrTiMoVB25-15-2 | 1.4980 | equivalent | Agrees in 2+ sources[8][6][11] |
| GB | 0Cr15Ni25Ti2MoAlVBformer designation in Kyocera's cross-reference | S51525 (China column of the Japan Stainless Steel Association cross-reference) | close | One source / reference[9][8] |
Differences between the equivalents (from the sources)
- JIS SUH660: Agrees between the Japan Stainless Steel Association cross-reference (SUH660 ↔ US (S66286), in parentheses) and Kyocera's cross-reference (SUH 660 ↔ S66286). The Japan Stainless Steel Association notes that "equivalence is not guaranteed". The JIS composition (Japan Stainless Steel Association) is C ≤0.08, Si ≤1.00, Mn ≤2.00, P ≤0.040, S ≤0.030, Ni 24.00-27.00, Cr 13.50-16.00, Mo 1.00-1.50, V 0.10-0.50, Ti 1.90-2.35, Al ≤0.35, B 0.001-0.010. Compared with the manufacturers' ranges, the lower limit of B and the upper limits of P and S differ
- EN X6NiCrTiMoVB25-15-2: Agrees between the Japan Stainless Steel Association (ISO 15510 X6NiCrTiMoVB25-15-2, EN 1.4980), voestalpine (1.4980 / Alloy 286 / UNS S66286, EN X6NiCrTiMoVB25-15-2) and Fagersta (EN 1.4980 / Type 660). voestalpine describes ASTM A453 Gr.660 as "similar" and AMS 5731 and 5732 as "comparable"
- GB 0Cr15Ni25Ti2MoAlVB: The grade designation is confirmed only by Kyocera and the unified numerical code only by the Japan Stainless Steel Association, and it has not been checked in Chinese primary sources that the two refer to the same grade. The aerospace name GH2132 appears in online materials but is 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 5525 | Steel, Corrosion and Heat-Resistant, Sheet, Strip, and Plate 15Cr - 25.5Ni - 1.2Mo - 2.1Ti - 0.006B - 0.30V 1800 °F (982 °C) Solution Heat TreatedSheet, strip and plate. Supplied solution treated at 982°C (revision letter L confirmed on SAE Mobilus) | Agrees in 2+ sources[12] |
| AMS 5731 | Steel, Corrosion- and Heat-Resistant, Bars, Wire, Forgings, Mechanical Tubing, Rings, and Stock for Forgings, Rings, or Heading 15Cr - 25.5Ni - 1.2Mo - 2.1Ti - 0.006B - 0.30V (A286) Consumable Electrode Remelted, 1800 °F (982 °C) Solution Heat Treated Precipitation HardenableBar, wire, forgings, tubing and rings. Consumable electrode remelted, solution treated at 982°C only (aging is done by the user). Revision letter M confirmed | Agrees in 2+ sources[13] |
| AMS 5732 | Steel, Corrosion- and Heat-Resistant, Bars, Wire, Forgings, Mechanical Tubing, Rings, and Stock for Forgings, Rings, or Heading 15Cr - 25.5Ni - 1.2Mo - 2.1Ti - 0.006B - 0.30V (A286) Consumable Electrode Remelted 1800 °F (982 °C) Solution and Precipitation Heat TreatedBar, wire, forgings, tubing and rings (up to 127 mm diameter). Consumable electrode remelted, solution treated at 982°C + precipitation hardened. Revision letter K confirmed | Agrees in 2+ sources[14] |
| AMS 5737 | Steel, Corrosion- and Heat-Resistant, Bars, Wire, Forgings, Mechanical Tubing, and Stock for Forging and Heading 15Cr - 25.5Ni - 1.2Mo - 2.1Ti - 0.006B - 0.30V (A286) Consumable Electrode Remelted 1650 °F (899 °C) Solution and Precipitation Heat TreatedBar, wire, forgings and tubing (up to 127 mm diameter). Consumable electrode remelted, solution treated at 899°C + precipitation hardened (the treatment that gives higher tensile and yield strength). Revision letter R confirmed | Agrees in 2+ sources[15] |
| AMS 5858 | STEEL SHEET, STRIP, AND PLATE, CORROSION AND HEAT RESISTANT 15Cr - 25.5Ni - 1.2Mo - 2.1Ti - 0.006B - 0.30V Multiple Melted, 1800°F (980°C) Solution Heat Treated, Welding GradeWelding grade of sheet, strip and plate (ATI describes it as a restricted composition for welding). This is the title of the page without a revision letter, and the title of the latest revision is not confirmed | One source / reference[16] |
| ASTM A453/A453M | Standard Specification for High-Temperature Bolting, with Expansion Coefficients Comparable to Austenitic Stainless SteelsBolting material for high-temperature service. Grade 660 is Class A, B, C, D (A286 type). The A453/A453M-26 page was confirmed at store.astm.org | Agrees in 2+ sources[17] |
| ASTM A638/A638M | Standard Specification for Precipitation Hardening Iron Base Superalloy Bars, Forgings, and Forging Stock for High-Temperature ServicePrecipitation-hardening iron-base superalloy bar and forgings for high-temperature service. Grades 660 and 662. The A638/A638M-23 page was confirmed at store.astm.org | Agrees in 2+ sources[18] |
All ASTM standards on Kezuriba: ASTM standards quick reference.
✈Main aerospace uses (as stated in the sources)
- Jet engine, turbocharger and missile parts: wheels and blades, casings, afterburner and silencer parts, fuel nozzles and fasteners (ATI)[3]
- Wire for bolts, nuts, shafts, springs, etc. in jet engines, gas turbines and turbochargers (Fagersta)[11]
- A-286 tubing was used in the hydrogen fuel injection nozzles of the Space Shuttle main engine (because it has strength and ductility from room temperature to cryogenic temperatures; Carpenter)[19]
⚗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 | ≤ 0.08[1][2] | — | — |
| Si | ≤ 1[1][2] | — | — |
| Mn | ≤ 2[1][2] | — | — |
| P | — | ≤ 0.025[1] | — |
| S | — | ≤ 0.015[1] | — |
| Ni | 24 – 27[1][2] | — | — |
| Cr | 13.5 – 16.0[1][2] | — | — |
| Mo | 1.0 – 1.5[1][2] | — | — |
| Ti | — | — | 1.90 – 2.35[1] |
| V | 0.1 – 0.5[1][2] | — | — |
| Al | ≤ 0.35[1][2] | — | — |
| B | 0.003 – 0.010[1][2] | — | — |
| Co | — | ≤ 1[1] | — |
- Spec ① Composition range of ATI A286 and Carpenter A-286 (both companies show correspondence to AMS 5525, 5731-5737 and ASTM A453, A638)
- Spec ② Composition range of ATI A286 (the voestalpine table per VdTÜV 453 reads as Co 2.00)
- Spec ③ Composition range of ATI A286. Carpenter and voestalpine (per VdTÜV 453) disagree, with an upper limit of 2.30
⚖Density
7.94 g/cm³
ATI (Allvac edition) gives 7.94. ATI (Ludlum edition) gives 7.92 solution treated and 7.94 after aging. Other sources differ slightly: ATI product page 7.98, voestalpine 7.95, Fagersta 8.0
Calculate weight in A286 →💪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 |
|---|---|---|---|---|---|
| Solution annealed | ≤ 724 | — | ≥ 25 | HRB 90 max | Value that ATI lists for the solution-treated condition of sheet and strip (105 ksi max). The page does not state which standard specifies it One source / reference[1] |
| Solution treated + precipitation hardened (AMS 5525, sheet and strip) | ≥ 965 | ≥ 655 | ≥ 15 | HRC 24–35 | Specified value (listed by ATI as the minimum "after precipitation hardening per AMS 5525": 140 ksi / 95 ksi) One source / reference[1] |
| Solution treated + precipitation hardened (ASTM A453 Grade 660 Class A, B, C) | ≥ 895 | ≥ 585 | — | HBW 248-341 (approx.) | Specified value (listed by voestalpine as the ASTM A453 value). Elongation could not be read from this document One source / reference[6] |
| Solution treated + precipitation hardened (ASTM A453 Grade 660 Class D, up to 63.5 mm diameter) | ≥ 895 | ≥ 725 | — | HBW 248-321 (approx.) | Specified value (listed by voestalpine as the ASTM A453 value; for diameter over 63.5 mm, tensile strength 825 min and yield strength 655 min) One source / reference[6] |
| Solution treated only / after aging | — | — | — | Solution treated HB 140-180, after aging HB 248-321 | Typical value (ATI; notes that hardness varies with Ti content and aging temperature) One source / reference[3] |
1 MPa ≈ 145 psi (0.145 ksi). Hardness conversion · unit converter
🔧Machinability notes (as stated in the sources)
- Machinability is close to that of austenitic stainless steel, and it is usually machined after aging or partial aging (ATI)[3]
- Because the soft solution-treated condition is gummy, it is generally machined after partial aging, full aging or overaging. Material cold worked after solution treatment is also easier to machine. Equipment and methods are the same as for 18-8 stainless steel (ATI)[7]
- Iron-base heat-resistant alloys are easier to machine than nickel-base and cobalt-base heat-resistant alloys. Use a lower cutting speed and a somewhat higher feed, keeping chip thickness at 0.1 mm or more to prevent work hardening. Use plenty of coolant, preferably at high pressure (Sandvik Coromant HRSA machining guide)[4]
📚Sources
Primary sources (public documents from makers, industry associations and standards bodies), numbered where each value is cited. Many are in Japanese.
- atimaterials.com https://www.atimaterials.com/Products/ati-a286
- carpentertechnology.com https://www.carpentertechnology.com/alloy-finder/A-286
- atimaterials.com https://www.atimaterials.com/Products/Documents/datasheets/nickel-cobalt/nickel-based/ati_…
- cdn2.sandvik.coromant.com https://cdn2.sandvik.coromant.com/files/a53b485b-be0f-019d-8100-3f0d1619b9fa/352d53f4-48bd…
- sandvik.coromant.com https://www.sandvik.coromant.com/en-us/knowledge/materials/workpiece-materials
- voestalpine.com https://www.voestalpine.com/specialtymetals/eu/app/uploads/sites/251/2025/12/Alloy-286_en.…
- atimaterials.com https://www.atimaterials.com/Products/Documents/datasheets/nickel-cobalt/nickel-based/ati_…
- jssa.gr.jp https://www.jssa.gr.jp/contents/products/standards/comparisons/
- kyocera.co.jp https://www.kyocera.co.jp/prdct/tool/wp-content/uploads/2016/06/R_2016.pdf
- jssa.gr.jp https://www.jssa.gr.jp/contents/products/standards/jis/heat_resistant/
- fagersta.marcegaglia.com https://www.fagersta.marcegaglia.com/wp-content/uploads/2023/07/A286-R569.60-ENG-2025-Edit…
- saemobilus.sae.org https://saemobilus.sae.org/content/ams5525l/
- saemobilus.sae.org https://saemobilus.sae.org/content/ams5731m/
- saemobilus.sae.org https://saemobilus.sae.org/content/ams5732k/
- saemobilus.sae.org https://saemobilus.sae.org/content/ams5737r/
- saemobilus.sae.org https://saemobilus.sae.org/content/ams5858/
- store.astm.org https://store.astm.org/a0453_a0453m-26.html
- store.astm.org https://store.astm.org/a0638_a0638m-23.html
- carpentertechnology.com https://www.carpentertechnology.com/hubfs/Alloy%20Cards/A-286_snapshot.pdf
Other materials
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