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UNS S66286 — A286 Material Designation
UNS S66286 is the canonical Unified Numbering System designation for A286 — the iron-nickel-chromium precipitation-hardening austenitic stainless steel superalloy. The S66286 prefix is the SAE / ASTM agreed-upon material identifier; subsidiary specifications (AMS 5731, 5732, 5737, ASTM A453 grade 660, ASTM A638 grade 660, DIN 1.4980, etc.) all reference UNS S66286 chemistry as the foundation. Engineers specifying A286 should cite UNS S66286 as the underlying material identifier, then a subsidiary spec (AMS or ASTM) for the heat-treatment, dimensional, and inspection requirements. See parent A286 AMS / ASTM specifications hub, related A286 equivalent grades cross-reference, sister designations DIN 1.4980, and the canonical A286 chemical composition.
Spec Scope & Coverage
UNS S66286 is a chemistry-only material designation — it specifies the element ranges that define A286 but does NOT specify form, heat-treatment, dimensional tolerance, or inspection requirements. Those are defined by subsidiary specs (AMS / ASTM / DIN / etc.). UNS S66286 element ranges per the SAE / ASTM Unified Numbering System: Fe balance (~53 %), Ni 24.0-27.0 %, Cr 13.5-16.0 %, Ti 1.90-2.35 %, Mo 1.00-1.50 %, V 0.10-0.50 %, Al 0.35 max, B 0.001-0.010 %, C 0.08 max, Mn 2.00 max, Si 1.00 max, P 0.025 max, S 0.015 max.
A286 Chemical Composition (UNS S66286)
| Element | Min % | Max % | Notes |
|---|---|---|---|
| Iron (Fe) | Balance | Balance | ~53 % typical |
| Nickel (Ni) | 24.0 | 27.0 | Solid-solution stabilizer |
| Chromium (Cr) | 13.5 | 16.0 | Corrosion + oxidation resistance |
| Titanium (Ti) | 1.90 | 2.35 | Gamma-prime former (Ni3Ti) |
| Molybdenum (Mo) | 1.00 | 1.50 | Solid-solution strengthener |
| Vanadium (V) | 0.10 | 0.50 | Carbide stabilizer |
| Aluminium (Al) | 0 | 0.35 | Gamma-prime former (Ni3Al) |
| Boron (B) | 0.001 | 0.010 | Grain-boundary strengthening |
| Carbon (C) | 0 | 0.08 | Per ASTM A453 |
| Manganese (Mn) | 0 | 2.00 | Per ASTM A453 |
| Silicon (Si) | 0 | 1.00 | Per ASTM A453 |
| Phosphorus (P) | 0 | 0.025 | Trace impurity |
| Sulphur (S) | 0 | 0.015 | Trace impurity |
UNS S66286 — A286 Material Designation — Spec Requirements
| UNS designation | Common name | Standard system | Application form |
|---|---|---|---|
| UNS S66286 | A286 / Iron Alloy 660 | Unified Numbering System (SAE / ASTM) | Universal — chemistry only |
| UNS S66286 | via AMS 5731 | SAE / AMS aerospace | Bar / forging / tubing — sol-treated |
| UNS S66286 | via AMS 5732 | SAE / AMS aerospace | Bar / forging / tubing — sol+aged |
| UNS S66286 | via AMS 5737 | SAE / AMS aerospace | Bar — precision aged |
| UNS S66286 | via AMS 5853 | SAE / AMS aerospace | Welding wire / rod |
| UNS S66286 | via ASTM A453 grade 660 | ASTM industrial | Bolting |
| UNS S66286 | via ASTM A638 grade 660 | ASTM industrial | Forgings |
| UNS S66286 | via ASTM B637 | ASTM industrial | Precipitation-hardenable bar |
| UNS S66286 | via DIN 1.4980 | DIN German / EU | Universal — Werkstoff designation |
When to Specify UNS S66286 — A286 Material Designation
- Universal material identifier: Cite UNS S66286 as the material chemistry foundation on every drawing involving A286 — provides the unambiguous chemistry reference.
- Subsidiary spec selection: Combine UNS S66286 with applicable subsidiary spec: AMS 5732 for aerospace bar, ASTM A453 grade 660 for industrial bolting, ASTM A638 grade 660 for forgings, DIN 1.4980 for European drawings.
- Material certification: EN 10204 mill certificates list UNS S66286 + applicable subsidiary specs the lot satisfies. Single material lot can be certified per multiple specs.
- Trade name avoidance: Cite UNS S66286 + applicable spec rather than trade names (Incoloy® A286, Pyromet® A286, ATI A286™) to allow mill flexibility.
- Cross-reference: A286 equivalent grades cross-reference page lists all designations referencing UNS S66286.
- US / European harmony: UNS S66286 + DIN 1.4980 + applicable AMS / ASTM spec covers global drawing reference systems.
UNS S66286 — A286 Material Designation — Frequently Asked Questions
What is UNS S66286?
Unified Numbering System designation for A286 — the iron-nickel-chromium precipitation-hardening superalloy. Chemistry-only material identifier (does not specify form, heat-treatment, or inspection). All A286 subsidiary specs (AMS 5731, AMS 5732, ASTM A453 grade 660, DIN 1.4980, etc.) reference UNS S66286 chemistry as the foundation.
Should I order by UNS S66286 alone?
NO — UNS S66286 is chemistry-only. You also need to specify a subsidiary spec for heat-treatment, dimensional, and inspection requirements. Example: 'A286 bar per UNS S66286 + AMS 5732' covers chemistry + aerospace bar requirements.
What are the UNS S66286 element ranges?
Fe balance (~53 %), Ni 24.0-27.0 %, Cr 13.5-16.0 %, Ti 1.90-2.35 %, Mo 1.00-1.50 %, V 0.10-0.50 %, Al 0.35 max, B 0.001-0.010 %, C 0.08 max, Mn 2.00 max, Si 1.00 max, P 0.025 max, S 0.015 max.
Is UNS S66286 the same as AISI 660?
Yes — AISI 660 was the older AISI designation for the same alloy; UNS S66286 has replaced it as the standard reference. Older drawings may still cite AISI 660 — treat as equivalent to UNS S66286 / A286.
How does UNS S66286 relate to DIN 1.4980?
Different national standards systems with equivalent chemistry. UNS S66286 is the SAE/ASTM unified numbering; DIN 1.4980 (X5NiCrTiMoVB25-15-2) is the German Werkstoff. Chemistry is identical within tolerance bands.
Can a mill certificate cite UNS S66286 alone?
Yes — UNS S66286 is a valid material designation. But for downstream traceability, the mill cert typically also lists the subsidiary spec the lot satisfies (AMS 5732, ASTM A453 grade 660, etc.) which provide the full property and inspection profile.
Where is UNS S66286 published?
ASTM-SAE Unified Numbering System for Metals and Alloys (most recent edition published by ASTM and SAE jointly). Online via ASTM and SAE websites.
Is UNS S66286 used in product schemas / drawings?
Yes — modern engineering drawings frequently cite UNS S66286 as the primary material designation, with subsidiary specs (AMS / ASTM / DIN) listed for the specific form and condition. Schema.org Material entity supports the UNS designation as material identifier.
What's the difference between UNS S66286 and trade names like Incoloy® A286?
UNS S66286 is the universal chemistry reference. Trade names (Incoloy® A286 Special Metals, Pyromet® A286 Carpenter, ATI A286™ Allegheny) are mill brand names for the same UNS S66286 chemistry. Specify UNS S66286 + applicable spec for ordering — avoid trade-name lock-in.
Mechanical Properties per This Spec
| Property | UNS S66286 typical | Notes |
|---|---|---|
| Tensile strength (MPa) | ≥ 895 (aged) | Per applicable subsidiary spec |
| Yield strength 0.2 % (MPa) | ≥ 655 (aged) | Per applicable subsidiary spec |
| Hardness HRC | 29-32 (aged) | Per applicable subsidiary spec |
Mating & Related Specifications
Common mating and related A286 specifications used alongside this spec:
- AMS 5731 — Bar / forging — sol-treated.
- AMS 5732 — Bar / forging — sol+aged.
- AMS 5737 — Precision bar — sol+aged.
- ASTM A453 grade 660 — Bolting.
- ASTM A638 grade 660 — Forgings.
- DIN 1.4980 — European designation.
Drawing Call-Out Example
A286, UNS S66286 chemistry, per AMS 5732 (or applicable subsidiary spec), product per drawing.
Related A286 Specifications & Reference
Other A286 specifications: AMS / ASTM hub · AMS 5525 · AMS 5731 · AMS 5732 · AMS 5737 · AMS 5853 · AMS 5895 · ASTM A453 grade 660 · ASTM A638 grade 660 · ASTM B637 · DIN 1.4980 · UNS S66286.
Canonical A286 reference: A286 chemical composition · A286 mechanical properties · A286 heat treatment · alloy comparisons (vs Inconel 718 · vs Waspaloy).
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