Specifications
Surface Treatments
Certifications
- ISO 9001 - 2015 Certified
- PED 2014/68/EC
- NACE MR0175/ISO 15156-2
- NORSOK M-650
- DFAR
- MERKBLATT AD 2000 W2/W7/W10
AMS 5734 — A286 Bar Solution-Treated
AMS 5734 is the SAE Aerospace Material Specification covering A286 (UNS S66286) bar and forging in solution-treated condition. Material is vacuum-induction-melted plus vacuum-arc-remelted (VIM-VAR) for aerospace inclusion control, hot-worked, then solution-treated 1800 °F (982 °C) and oil-quenched. Used as raw stock for downstream aging and machining of aerospace components. Distinguished from AMS 5731 by tighter aerospace AQMS controls and consumable-electrode-melt requirement. See parent A286 AMS / ASTM specifications hub, related A286 round bar, sister specs AMS 5731, AMS 5732, AMS 5737, AMS 5736.
Spec Scope & Coverage
AMS 5734 covers A286 bar and forging in solution-treated condition. VIM-VAR melted ingot, hot-worked to bar diameter, solution-treated 1800 °F (982 °C) per the spec, oil-quenched. Hardness 24-28 HRC after sol-treatment; bar to be aged downstream. Used as raw stock for downstream cold-heading, machining, and forging operations where aerospace consumable-electrode-melt traceability is required.
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 |
AMS 5734 — A286 Bar Solution-Treated — Spec Requirements
| Property | AMS 5734 requirement | Notes |
|---|---|---|
| Form | Bar, forging | Aerospace VIM-VAR |
| Melt practice | VIM + VAR (consumable electrode) | Inclusion control standard |
| Heat treatment | Solution-treated 1800 °F (982 °C) | Aging done downstream |
| Tensile (sol-treated) | Per spec — typically 670 MPa | Customer ages to develop full strength |
| Hardness (sol-treated) | 24-28 HRC | Sol-treated condition |
| Surface finish | Hot-rolled pickled | No mill scale |
| Magnetic permeability | < 1.005 | Per ASTM A342 |
| AQMS | AS9100D | Aerospace AQMS required |
When to Specify AMS 5734 — A286 Bar Solution-Treated
- Aerospace cold-heading raw stock: AMS 5734 sol-treated bar feeds cold-heading into A286 hex bolts, SHCS with downstream aging.
- VIM-VAR aerospace requirement: Specify AMS 5734 when aerospace double-melt (VIM + VAR) is mandated by drawing — not all AMS 5731 mills supply VIM-VAR.
- Pre-aged alternative: For aged bar ready for use, specify AMS 5732 or AMS 5737.
- Industrial alternative: ASTM B637 for non-aerospace applications.
Mechanical Properties per This Spec
| Property | Min value (sol-treated) | After customer aging |
|---|---|---|
| Tensile strength (MPa) | ≥ 670 | ≥ 895 |
| Yield strength 0.2 % (MPa) | ≥ 380 | ≥ 585 |
| Hardness HRC | 24-28 | 29-32 |
A286 Products Manufactured per This Spec
Mating & Related Specifications
- AMS 5731 — Sol-treated bar — alternate without strict VIM-VAR requirement.
- AMS 5732 — Mill-aged variant — ready for use.
- AMS 5736 — Sol-treated + aged from VIM-VAR melt.
Drawing Call-Out Example
A286 bar, AMS 5734, VIM-VAR melt, sol-treated, ⌀ 25.4 mm × 3000 mm length, hot-rolled pickled finish, EN 10204 3.1, AS9100D AQMS.
AMS 5734 — A286 Bar Solution-Treated — Frequently Asked Questions
What is AMS 5734?
SAE / AMS spec covering A286 (UNS S66286) bar and forging in solution-treated condition with VIM-VAR (vacuum-induction-melted + vacuum-arc-remelted) consumable-electrode melt practice. Customer performs aging downstream.
AMS 5734 vs AMS 5731 — which to specify?
AMS 5734: VIM-VAR consumable-electrode melt required (aerospace inclusion control). AMS 5731: VIM-only or VIM-VAR acceptable. Specify AMS 5734 when drawing requires double-melt; AMS 5731 for general aerospace bar without strict melt-practice requirement.
Is AMS 5734 cheaper than AMS 5732?
Slightly — AMS 5734 omits the aging step, saving 16 hours of furnace time. Customer must perform aging downstream. Typical 5-10 % cost savings vs AMS 5732 from the same VIM-VAR mill.
What's the heat-treatment temperature for AMS 5734?
Solution-treatment 1800 °F (982 °C) for 1 hour per inch of section, oil-quench. NO aging at the mill — customer ages downstream at 1325 °F (718 °C) for 16 hours.
Can AMS 5734 bar be used directly without aging?
NO — sol-treated condition has only ~380 MPa yield. Must be aged downstream to develop full A286 mechanical properties (130 ksi tensile / 95 ksi yield).
Is AMS 5734 magnetic?
No. Magnetic permeability < 1.005 verified per ASTM A342. Compatible with non-magnetic instrumentation and aerospace electromagnetic-sensitive applications.
What's the lead time on AMS 5734 bar?
Standard sizes 5-50 mm: 4-6 weeks from heat release. Larger sizes 50-200 mm: 6-10 weeks. Aerospace AS9102 first-article: add 1-2 weeks. VIM-VAR mill scheduling may add 2-3 weeks.
Can AMS 5734 be NACE MR0175 compliant?
Yes after aging — when aged hardness ≤ HRC 35 (HV ≤ 327) per NACE MR0175 / ISO 15156-3. Specify on PO.
What products use AMS 5734 stock?
Aerospace fasteners (cold-headed from sol-treated bar, then aged), aerospace machined components (machined sol-treated, aged after final geometry), and forged blanks for downstream forging operations.
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.
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