Hangbo Alloy Group
Shanghai · Est. 2012
UNS S66286 / W.Nr. 1.4980 — Chemical composition, mechanical properties, heat treatment, and applications for aerospace fasteners, turbine hardware, and high-temperature bolting.
Alloy A-286 (UNS S66286 / W.Nr. 1.4980) is an iron-nickel-chromium superalloy strengthened by titanium and molybdenum additions and hardened by a precipitation-aging treatment. Often called Incoloy A-286, Pyromet A-286, or Cronifer 1525 Ti, it was one of the original precipitation-hardenable superalloys and remains a cost-effective choice when high strength and oxidation resistance are required up to about 700°C (1290°F). Its balanced chemistry gives mechanical properties comparable to some nickel-base alloys at a fraction of the cost.
Because of its excellent creep resistance, good fabricability, and corrosion resistance similar to austenitic stainless steels, A-286 is widely used for jet engine fasteners, turbine wheels, automotive turbochargers, nuclear components, and high-temperature springs and bolts. It is produced by vacuum induction melting (VIM) followed by vacuum arc remelting (VAR) or electroslag remelting (ESR) for critical aerospace grades.
The composition of A-286 is carefully balanced to provide a stable austenitic matrix, precipitation-hardening capability through Ni₃(Ti,Al) γ' phase, and solid-solution strengthening from molybdenum and chromium.
| Element | Min % | Max % |
|---|---|---|
| Iron (Fe) | Balance | Balance |
| Nickel (Ni) | 24.0 | 27.0 |
| Chromium (Cr) | 13.5 | 16.0 |
| Molybdenum (Mo) | 1.0 | 1.5 |
| Titanium (Ti) | 1.90 | 2.35 |
| Vanadium (V) | 0.10 | 0.50 |
| Manganese (Mn) | 1.0 | 2.0 |
| Boron (B) | 0.003 | 0.010 |
| Carbon (C) | — | 0.08 |
| Silicon (Si) | — | 0.50 |
| Aluminum (Al) | — | 0.35 |
| Cobalt (Co) | — | 1.0 |
| Copper (Cu) | — | 0.50 |
| Phosphorus (P) | — | 0.025 |
| Sulfur (S) | — | 0.015 |
| Lead (Pb) | — | 0.005 |
A-286 retains an austenitic face-centered-cubic structure from cryogenic temperatures to its maximum service temperature, giving excellent toughness and dimensional stability.
| Property | Value | Unit |
|---|---|---|
| Density | 7.94 | g/cm³ |
| Melting Range | 1364–1424 | °C |
| Specific Heat (21°C) | 460 | J/kg·K |
| Thermal Conductivity (21°C) | 15.9 | W/m·K |
| Electrical Resistivity (21°C) | 0.91 | μΩ·m |
| Modulus of Elasticity (21°C) | 205 | GPa |
| Mean Coefficient of Thermal Expansion (20–100°C) | 16.4 | μm/m·°C |
Mechanical properties vary significantly with condition. The table below shows typical values for solution-treated plus aged bar and forgings per AMS 5737 / ASTM A453 Grade 660.
| Property | Value |
|---|---|
| Tensile Strength | 1000–1300 MPa (145–188 ksi) |
| Yield Strength (0.2% offset) | 650–900 MPa (94–130 ksi) |
| Elongation in 2 inches | 15–25% |
| Reduction of Area | 25–40% |
| Hardness (Brinell) | 248–321 HB |
| Impact Strength (Charpy V-notch) | ≥ 40 J |
A-286 maintains useful strength to about 650°C and short-term strength to 700°C. Creep and stress-rupture life depend strongly on solution-treatment temperature; the higher 982°C (1800°F) solution treatment optimizes creep resistance, while the 899°C (1650°F) treatment gives higher room-temperature tensile strength.
| Temperature (°C) | Tensile Strength (MPa) | Yield Strength (MPa) | Elongation (%) |
|---|---|---|---|
| 21 (Room) | 1100 | 750 | 22 |
| 316 | 980 | 690 | 20 |
| 427 | 930 | 650 | 19 |
| 538 | 860 | 600 | 18 |
| 649 | 720 | 520 | 20 |
| 704 | 620 | 450 | 22 |
Standard commercial heat treatment for A-286 is solution treatment at 980–1000°C for 2 hours, oil or water quench, followed by aging at 700–720°C for 16 hours and air cool. Aerospace specifications such as AMS 5737 use a 1650°F (899°C) solution treatment plus age for maximum strength; AMS 5731 uses an 1800°F (982°C) solution treatment for improved creep resistance.
A-286 provides corrosion resistance similar to Type 310 austenitic stainless steel in many industrial environments. Its high chromium content forms a protective oxide scale, while nickel and molybdenum improve resistance to reducing media.
The combination of high strength, good oxidation resistance, and low material cost makes A-286 a popular choice across aerospace, energy, automotive, and chemical industries.
Hangbo Alloy Group manufactures and supplies Alloy A-286 in the following forms, with mill test certificates and third-party inspection available:
| Standard | Description |
|---|---|
| AMS 5731 | Bars, Rings, Forgings & Tubing — 1800°F solution treatment |
| AMS 5732 | Bars, Rings, Forgings & Tubing — 1800°F solution + age |
| AMS 5734 | Bars, Rings, Forgings & Tubing — 1650°F solution treatment |
| AMS 5737 | Bars, Rings, Forgings & Tubing — 1650°F solution + age |
| AMS 5525 | Sheet, Strip & Plate |
| AMS 5853 | Sheet, Strip & Plate |
| ASTM A453 Grade 660 | High-temperature bolting |
| ASTM A638 | Forgings, forging stock and bar |
| ASME SA-638 | Boiler and pressure vessel forgings |
| BS HR 52 / HR 650 | British aerospace specifications |
| ISO 15156-3 / NACE MR 0175 | Sour service oil & gas |
| W.Nr. 1.4980 | German material designation |
Hangbo Alloy Group is a leading Alloy A-286 supplier and manufacturer in China, stocking round bars, wire, forgings, plates, and machined fasteners. We provide mill test certificates, third-party inspection (SGS, TUV), and competitive price quotes for global buyers.
Email: [email protected] | Phone / WhatsApp: +86-136-1165-6360
Alloy A-286 (UNS S66286 / W.Nr. 1.4980) is an iron-nickel-chromium precipitation-hardenable superalloy designed for applications requiring high strength and good corrosion resistance up to about 700°C (1290°F). It is often classified as an austenitic stainless steel or a low-cost nickel-iron superalloy.
Alloy A-286 contains 24.0–27.0% nickel, 13.5–16.0% chromium, 1.0–1.5% molybdenum, 1.90–2.30% titanium, 0.10–0.50% vanadium, 0.003–0.010% boron, 1.0–2.0% manganese, up to 0.08% carbon, balance iron. Small amounts of aluminum, cobalt, copper and lead are also controlled.
The density of Alloy A-286 is 7.94 g/cm³ (0.287 lb/in³), slightly lower than many nickel-base superalloys, which helps reduce component weight in aerospace fasteners and turbine hardware.
Alloy A-286 has a melting range of approximately 1364–1424°C (2487–2595°F), depending on exact composition and test method.
Common standards include AMS 5731, AMS 5732, AMS 5734, AMS 5737, AMS 5853, ASTM A453 Grade 660, ASTM A638, ASME SA-638, BS HR 52, BS HR 650, ISO 15156-3 / NACE MR 0175, W.Nr. 1.4980 and UNS S66286.
Typical heat treatment is solution treatment at 980–1000°C (1800°F) for 2 hours, oil or water quench, followed by aging at 700–720°C (1300–1400°F) for 16 hours and air cool. A 1650°F (899°C) solution treatment plus age gives higher tensile/yield strength, while 1800°F (982°C) solution treatment plus age optimizes creep and stress-rupture strength.
In the annealed condition tensile strength is 600–750 MPa. After solution plus aging, typical tensile strength reaches 1000–1300 MPa, yield strength 650–900 MPa, with good elongation and impact toughness. Spring temper plus aged wire can reach 1300–1500 MPa.
Alloy A-286 is suitable for long-term service up to about 650°C (1200°F) and short-term exposure to 700°C (1290°F). Above 700°C, microstructural coarsening can reduce strength and creep resistance.
Alloy A-286 offers lower cost and lower density than Inconel 718, with good strength to 650°C. Inconel 718 provides higher strength and better creep resistance above 650°C, especially for aerospace turbine discs and critical rotating hardware. A-286 is preferred when cost and weight are critical and operating temperatures are moderate.
Yes, Alloy A-286 can be welded in the solution-treated condition using GTAW/TIG, GMAW/MIG, resistance and electron beam welding. It is prone to hot cracking in the aged condition, so welding is usually done before final aging, with a post-weld age cycle to restore strength.
Alloy A-286 has corrosion resistance comparable to austenitic stainless steels in many environments, with good oxidation resistance up to 980°C (1800°F) and good resistance to sulfurous atmospheres at elevated temperature. It resists mild acids, seawater and chloride stress corrosion cracking better than many steels.
Typical applications include jet engine fasteners, turbine wheels and blades, afterburner parts, supercharger components, automotive exhaust valves and turbochargers, nuclear reactor hardware, chemical processing high-pressure valves and flanges, and high-temperature springs and bolts.
Hangbo Alloy Group supplies Alloy A-286 as round bars, wire rods, cold-drawn wire, precision forgings, rings, discs, plates, sheets and strips, as well as machined fasteners and custom components. Sizes and specifications can be tailored to customer requirements.
Pricing depends on product form, size, specification, quantity and raw material nickel/chromium prices. Contact Hangbo Alloy Group at [email protected] or call/WhatsApp +86-136-1165-6360 for a competitive quote. We typically respond within 10 minutes.
For standard round bars and wire, MOQ is generally 100 kg and lead time is 2–4 weeks. Custom forgings and machined parts require 4–6 weeks depending on complexity. Stock items can ship within 3–5 days.
For quotations, material certifications, or technical support on Alloy A-286 (UNS S66286), contact Hangbo Alloy Group. We typically respond within 10 minutes and ship worldwide from our Shanghai facility.
Email: [email protected]
Phone: +86-136-1165-6360
WhatsApp: +86 13611656360
Request a quotation for Alloy A-286 round bars, wire, forgings, plates, or machined fasteners. We stock standard sizes and accept custom orders.