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    3. A286 Equivalent Material

    A286 Equivalent Material — UNS, AMS, ASTM, DIN Cross-Reference

    A286 equivalent grades — A286 is known by many designations across ASTM, AMS, DIN, EN, JIS, BS, and proprietary trade-name standards. All refer to the same iron-nickel-chromium precipitation-hardening superalloy with UNS S66286 chemistry. This cross-reference page provides the full list of equivalent designations, trade names, and applicable standards. Engineers selecting A286 should verify the specific spec called out on the drawing — different standards have slightly different chemistry tolerances and heat-treatment requirements. Quick answer: A286 = Alloy 660 = Iron Alloy 660 = UNS S66286 = DIN 1.4980 = X5NiCrTiMoVB25-15-2 = Incoloy® A286 = Pyromet® A286 = ATI A286™ = Tinidur® = Werkstoff 1.4980. See parent A286 stainless steel, related A286 vs Inconel 718, A286 vs 17-4 PH, A286 vs Waspaloy, A286 vs Nimonic 80A, and the canonical A286 chemical composition.

    About A286 (UNS S66286)

    UNS S66286 is the canonical Unified Numbering System designation for A286 — used as the reference chemistry across all subsidiary standards. Element ranges per UNS S66286: Fe balance, Ni 24.0-27.0 %, Cr 13.5-16.0 %, Ti 1.9-2.35 %, Mo 1.0-1.5 %, V 0.10-0.50 %, Al 0.35 max, B 0.001-0.010 %. All other A286 designations (DIN 1.4980, ASTM A453 grade 660, AMS 5731, etc.) reference UNS S66286 chemistry as the foundation; subsidiary specs add specific heat-treatment, dimensional, and inspection requirements.

    About Equivalent designations

    Trade-name and proprietary equivalents — major mill suppliers brand A286 under their own trade names: Incoloy® A286 (Special Metals Corporation, USA), Pyromet® A286 (Carpenter Technology, USA), ATI A286™ (Allegheny Technologies, USA), Tinidur® (German trade name, historical), TURBALOY® 286VM (United States Welding Corporation). All produce A286 to UNS S66286 chemistry. When ordering, specify the underlying standard (ASTM A453 grade 660, AMS 5732, etc.) rather than the trade name to avoid mill-substitution issues.

    A286 Equivalent Material — UNS, AMS, ASTM, DIN Cross-Reference — Side-by-Side Comparison

    DesignationStandard / originForm / scopeChemistry equivalentCommon usage
    UNS S66286Unified Numbering System (USA)Universal — all formsReferenceMaterial identifier
    A286 / A-286Common name (USA)Universal — all forms≡ UNS S66286Most-used name
    Iron Alloy 660ASTM common nameBolting≡ UNS S66286ASTM designation
    Alloy 660Common nameAll forms≡ UNS S66286Equivalent name
    AISI 660AISI common nameStainless steel≡ UNS S66286Older AISI designation
    DIN 1.4980German Werkstoff-Nr.Universal≡ UNS S66286European standard
    X5NiCrTiMoVB25-15-2DIN material designationUniversal≡ UNS S66286DIN long-form name
    ASTM A453 grade 660 Cl. A/B/C/DASTM standardBoltingVarious heat-treatsHigh-temperature bolting
    ASTM A638 grade 660 Type 1/2ASTM standardForgingsTwo heat-treat variantsForged stock
    ASTM B637ASTM standardBar, precipitation-hardenable≡ UNS S66286Industrial bar
    AMS 5525SAE / AMS specSheet, plate, sol-treated≡ UNS S66286Aerospace sheet
    AMS 5731SAE / AMS specBar / forging, sol-treated≡ UNS S66286Aerospace bar
    AMS 5732SAE / AMS specBar / forging, sol+aged≡ UNS S66286Aerospace mill-aged
    AMS 5734 / 5736SAE / AMS specBar / forging variants≡ UNS S66286Aerospace specific
    AMS 5737SAE / AMS specBar, sol+aged precision≡ UNS S66286Precision aerospace
    AMS 5853SAE / AMS specWelding wire≡ UNS S66286Matching A286 weld filler
    AMS 5895SAE / AMS specSheet/strip, aged≡ UNS S66286Aged aerospace sheet
    DIN 17240German standardHeat-resistant steels≡ UNS S66286Older German standard
    BS HR1 / HR51 / HR52British standardHeat-resistant steelsSimilar chemistryUK aerospace
    SAE J467SAE common nameStainless / heat-resistant≡ UNS S66286Material designation
    Incoloy® A286Special Metals trade nameMill brand≡ UNS S66286USA mill product
    Pyromet® A286Carpenter trade nameMill brand≡ UNS S66286USA mill product
    ATI A286™ATI trade nameMill brand≡ UNS S66286USA mill product
    Tinidur®German trade name (historical)Mill brand≡ UNS S66286European mill product

    When to Choose Each Alloy

    • Specify ASTM A453 grade 660 when: High-temperature bolting per ASTM A193-class designation. Class A through D defines specific heat-treatment + property combinations. The dominant US-spec for bolting.
    • Specify ASTM A638 grade 660 when: Forged components for pressure-bearing service. Type 1 and Type 2 differ in heat-treatment (sol 1650 °F vs 1800 °F) — choose by required strength vs stress-rupture priority.
    • Specify AMS 5732 when: Aerospace bar / forging, mill-aged, ready for fabrication without further heat-treatment. The most common aerospace mill spec.
    • Specify AMS 5737 when: Aerospace precision bar with tighter heat-treatment + hardness window. Used for high-volume cold-headed fasteners and aerospace machined components.
    • Specify DIN 1.4980 when: European drawings and aerospace standards. Chemistry identical to AMS 5731 / 5732; differences are language/unit conventions only.
    • Specify UNS S66286 when: Universal applicability — confirms the underlying chemistry without restricting to a specific subsidiary spec.

    Applications by Industry

    • Aerospace specifying: AMS 5732 / 5737 dominant on US-spec aerospace drawings. NAS 1351 / 6603 for finished fasteners. AS9100D AQMS lot-traceability.
    • European aerospace: DIN 1.4980 and EN 10269 dominant on Airbus, Eurocopter, Snecma drawings.
    • Petrochemical: ASTM A453 grade 660 Class A / B for bolting. ASTM A182 grade A286 for flanges. ASTM B637 for general industrial bar.
    • Nuclear: ASTM A453 grade 660 + ASME III subsection NB / NF acceptance. EN 10204 3.2 third-party witness standard.
    • Industrial gas turbine: AMS 5731 / 5732 for bolting; ASTM A638 grade 660 for forgings. Matched A286 hex bolts + flat washers + hex nuts for casing-split bolted joints.
    • Defence / Mil-spec: MIL-S-25027 (self-locking nuts), MS 90725 / 90726 (hex bolts), NAS 1351 / 6603 (SHCS / 12-point) all reference UNS S66286 / AMS 5732 chemistry.

    A286 Equivalent Material — UNS, AMS, ASTM, DIN Cross-Reference — Frequently Asked Questions

    Are all A286 designations equivalent?

    Yes — A286, A-286, Iron Alloy 660, Alloy 660, AISI 660, UNS S66286, DIN 1.4980, X5NiCrTiMoVB25-15-2, Incoloy® A286, Pyromet® A286, ATI A286™, Tinidur® all refer to the same iron-nickel-chromium precipitation-hardening superalloy with UNS S66286 chemistry. Subsidiary specs differ in heat-treatment and inspection requirements only.

    What's the most authoritative A286 designation?

    UNS S66286 — the universal Unified Numbering System designation. All other names reference UNS S66286 chemistry. For ordering, specify the applicable subsidiary spec (ASTM A453 grade 660, AMS 5732, etc.) which incorporates UNS S66286 chemistry plus heat-treatment + dimensional requirements.

    What's the difference between Incoloy® A286 and Pyromet® A286?

    Both are A286 trade names from different US mills (Special Metals Corp and Carpenter Technology respectively). Material is identical (UNS S66286). When ordering, specify the underlying standard (e.g. AMS 5732) rather than the trade name to allow mill flexibility.

    Is DIN 1.4980 the same as A286?

    Yes — DIN 1.4980 (Werkstoff Nr.) and X5NiCrTiMoVB25-15-2 (DIN long-form material designation) are German equivalents of A286. Chemistry is identical to UNS S66286 within the spec tolerance bands.

    What's the relationship between Iron Alloy 660 and A286?

    Iron Alloy 660 is the ASTM A453 grade 660 designation — same alloy as A286. The '660' nomenclature comes from the original ASTM grade number; A286 is the common-name designation. Both reference UNS S66286.

    Is AISI 660 still an active designation?

    AISI 660 is largely deprecated; UNS S66286 has replaced it as the standard reference. Older drawings may still cite AISI 660 — treat as equivalent to UNS S66286 / A286.

    How do AMS 5731 vs AMS 5732 differ?

    AMS 5731: solution-treated only — downstream user performs aging. AMS 5732: solution-treated AND precipitation-aged from the mill, ready for use. AMS 5731 is preferred when aging needs to be timed with downstream fabrication; AMS 5732 is the most common mill-aged spec.

    Are British BS HR1 / HR51 / HR52 equivalent to A286?

    BS HR-series covers heat-resistant steels with similar chemistry to A286. Chemistry tolerance bands may differ slightly per the specific HR designation. For UK aerospace and modern drawings, AMS 5732 / DIN 1.4980 / UNS S66286 are preferred over BS HR-series.

    Should I specify trade name (Pyromet® A286) or standard (AMS 5732)?

    Always specify the underlying standard (AMS 5732, ASTM A453 grade 660, etc.) — this allows mill flexibility and avoids trade-name-specific lock-in. Trade names like Pyromet® A286 are useful for material identification but should not be the only specification on a drawing.

    Related Comparisons & A286 Reference

    Compare A286 against other precipitation-hardening alloys: A286 vs Inconel 718 · A286 vs 17-4 PH · A286 vs Waspaloy · A286 vs Nimonic 80A · A286 equivalent grades cross-reference.

    Canonical A286 reference: A286 chemical composition · A286 mechanical properties · A286 heat treatment · A286 machinability · AMS / ASTM specifications hub.

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