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AMS 5525 — A286 Sheet, Strip and Plate Solution-Treated
AMS 5525 is the SAE Aerospace Material Specification covering A286 (UNS S66286) sheet, strip and plate in solution-treated condition. Issued by SAE International, latest revision incorporates ASTM-A638-equivalent chemistry. AMS 5525 is the dominant aerospace sheet/plate spec for combustor liner shells, exhaust diffuser panels, structural reinforcement plates, and downstream blanking input for A286 flat washers and aerospace stamped components. Distinguished from AMS 5895 (aged sheet/strip) by heat-treatment condition — AMS 5525 is sol-treated only; AMS 5895 is sol-treated + precipitation-aged. See parent A286 AMS specifications hub, related A286 plate, A286 sheet, sister spec AMS 5895, and the canonical A286 chemical composition.
Spec Scope & Coverage
AMS 5525 covers A286 sheet (≤ 6 mm), strip (≤ 1.6 mm), and plate (6-100 mm) in solution-treated condition. Material is supplied as VIM-VAR melted ingot, hot-rolled to plate thickness, hot-rolled or cold-rolled to sheet thickness, then solution-treated 1800 °F (982 °C) per the spec, oil-quenched, and pickled. Hardness 24-28 HRC after sol-treatment; bar to be aged downstream. Used as raw input for: combustor liner shell forming, exhaust diffuser panels, blank input for flat washer stamping, and aerospace structural reinforcement plates.
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 |
AMS 5525 — A286 Sheet, Strip and Plate Solution-Treated — Spec Requirements
| Property | AMS 5525 requirement | Notes |
|---|---|---|
| Form | Sheet, strip, plate | Per spec — separate ranges for each form |
| Thickness range | Sheet ≤ 6 mm; plate 6-100 mm | Aerospace standard ranges |
| Heat treatment | Solution-treated 1800 °F (982 °C) | Sol only — NOT aged from mill |
| Tensile strength | ≥ 670 MPa (97 ksi) | Sol-treated condition |
| Yield strength | ≥ 380 MPa (55 ksi) | Sol-treated condition |
| Elongation | ≥ 25 % | In 50 mm gauge length |
| Hardness | 24-28 HRC | Sol-treated |
| Surface finish | Pickled | No mill scale; passivation on request |
| Magnetic permeability | < 1.005 | Per ASTM A342 verification |
When to Specify AMS 5525 — A286 Sheet, Strip and Plate Solution-Treated
- Combustor liner shell forming: AMS 5525 plate (6-25 mm) hot-formed to combustor liner shape, then sol-treated and aged after forming. Used by Siemens / GE / Mitsubishi gas-turbine combustor liner manufacturers.
- Exhaust diffuser panels: AMS 5525 plate 6-12 mm thickness for exhaust diffuser segment forming. Aerospace and industrial gas-turbine applications.
- Flat washer blanking input: AMS 5525 sheet 0.5-4 mm thickness blanked into A286 flat washers per DIN 125 / 9021 / ISO 7089.
- Aerospace structural reinforcement: AMS 5525 plate machined to mounting brackets, attach lugs, structural reinforcement gussets.
- Pre-aged sheet alternative: For aged sheet ready for use, specify AMS 5895 instead of AMS 5525.
AMS 5525 — A286 Sheet, Strip and Plate Solution-Treated — Frequently Asked Questions
What is AMS 5525?
SAE / AMS spec covering A286 (UNS S66286) sheet, strip, and plate in solution-treated condition. The dominant aerospace sheet/plate spec for combustor liner forming, exhaust diffuser panels, and downstream stamping into flat washers and other components.
What's the difference between AMS 5525 and AMS 5895?
AMS 5525: sol-treated only — material is soft (24-28 HRC), suitable for cold-forming and downstream aging. AMS 5895: sol-treated AND precipitation-aged — final hardness 29-32 HRC, ready for use without further heat-treatment. Choose by required forming + aging timing.
Is AMS 5525 the same as ASTM A638?
Different scope: AMS 5525 is aerospace sheet/strip/plate; ASTM A638 grade 660 is forgings. Chemistry is identical (UNS S66286). Choose by form: AMS 5525 for sheet/plate; ASTM A638 for forgings.
What thickness range does AMS 5525 cover?
Sheet ≤ 6 mm; strip ≤ 1.6 mm; plate 6-100 mm. Aerospace lots typically 1-12 mm thickness; nuclear / pressure-vessel lots may go to 100 mm.
Is AMS 5525 sol-treated material formable?
Yes — the sol-treated soft condition (24-28 HRC) is suitable for cold-forming, hot-forming, deep drawing, and stamping. Bend radius ≥ 2 × thickness. Aging done after forming to develop full strength.
What's the lead time on AMS 5525 sheet?
Standard sizes 0.5-12 mm thickness × up to 1500 × 6000 mm: 8-12 weeks from heat release. Larger plates 12-100 mm: 12-16 weeks. Aerospace AS9102 first-article: add 1-2 weeks.
Is AMS 5525 magnetic?
No. Magnetic permeability < 1.005 verified per ASTM A342 on every aerospace heat. Critical for non-magnetic combustor liner forming and aerospace electromagnetic-sensitive panel applications.
Can AMS 5525 be welded?
Yes — TIG / GTAW with matching A286 welding rod (AMS 5853). Sol-treated condition is the preferred starting condition for welding (avoid welding aged material due to strain-age cracking risk).
How does AMS 5525 chemistry differ from other A286 specs?
Chemistry is identical to all other A286 specs (UNS S66286 reference). Heat treatment differs (sol-treated only for AMS 5525) and form/size scope differs (sheet/plate for AMS 5525 vs bar for AMS 5731-5737).
Mechanical Properties per This Spec
| Property | Min value (sol-treated) | Notes |
|---|---|---|
| Tensile strength (MPa) | ≥ 670 | Sol-treated condition; aging by customer |
| Yield strength 0.2 % (MPa) | ≥ 380 | Sol-treated; rises to ≥ 655 after aging |
| Elongation (%) | ≥ 25 | In 50 mm gauge, sol-treated |
| Hardness HRC | 24-28 | Sol-treated; rises to 29-32 aged |
A286 Products Manufactured per This Spec
TorqBolt manufactures the following A286 products to this specification:
Mating & Related Specifications
Common mating and related A286 specifications used alongside this spec:
- AMS 5895 — Aged variant of sol-treated AMS 5525 — for direct use without further heat-treatment.
- ASTM A638 grade 660 — Forging spec for thicker plate / forged components.
- UNS S66286 — Underlying chemistry reference.
Drawing Call-Out Example
A286 sheet, AMS 5525, sol-treated, 4.0 mm thickness × 1500 mm × 6000 mm, pickled finish, EN 10204 3.1, magnetic permeability < 1.005.
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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