Incoloy A-286 (UNS S66286) - Fe-Ni-Cr Precipitation Hardening Superalloy Supplier of Round Bars, Bolts & Plates | Shanghai Hangbo Alloy Group
Date: 2026年7月25日 Categories: News Views: 412
By Shanghai Hangbo Alloy Group Co., Ltd. - China Supplier | ISO 9001:2015 Certified | Est. 2012
Contact: sales@hangboalloy.com | hangbo@nickel-alloy.com | WhatsApp (Lisa): +86 13611656360
Quick Answer: What Is Incoloy A-286?
Incoloy A-286 (UNS S66286 / W.Nr. 1.4980) is an iron-nickel-chromium precipitation-hardening superalloy that delivers high tensile strength (>=895 MPa aged) and excellent creep rupture resistance to ~700C at approximately 40-50% lower raw material cost than Inconel 718. It is the industry-standard alloy for high-temperature bolting (ASTM A453 Grade 660), gas turbine discs, jet engine afterburner components, and turbocharger wheels. Shanghai Hangbo Alloy Group supplies A-286 as round bars, forged bolts, and plates with full AMS 5731/5732/5737 certification.
Industry Pain Point: Gas turbine engineers routinely specify Inconel 718 for intermediate-temperature components operating at 500-650C because "it's the strongest option available." But 718's niobium content (5%) makes it 2-3x the cost of A-286, and for components that will never exceed 700C, that premium buys nothing. A-286 meets the same ASME allowable stress values as 718 up to 650C at roughly half the material cost.
Key Properties at a Glance
| Property | Value |
|---|---|
| UNS Number | S66286 |
| W.Nr. | 1.4980 |
| Alloy Family | Fe-Ni-Cr Precipitation-Hardening Superalloy |
| Density | 7.92 g/cm3 (0.286 lb/in3) |
| Melting Range | 1370-1430C (2500-2600F) |
| Gamma-Prime Solvus | ~730C |
| Max Service Temp. | ~700C (~1300F) |
| Tensile Strength (RT, Aged) | >= 895 MPa (>= 130 ksi) |
| Yield Strength (RT, Aged) | >= 585 MPa (>= 85 ksi) |
| Elongation (RT, Aged) | >= 15% |
| Key Standards | ASTM A453 Gr.660, ASTM A638, AMS 5731/5732/5737 |
Product Overview
Incoloy A-286 occupies the commercially critical space between the austenitic stainless steels (304/316/310) and the premium nickel-base superalloys (718, Waspaloy). It is chosen when the application demands precipitation-hardening strength -- the 2:1 strength advantage over annealed austenitic stainless -- but the budget cannot justify Inconel 718.
The hardening mechanism is classical gamma-prime precipitation: nickel and titanium combine to form coherent, ordered Ni3Ti precipitates (FCC L12 structure, ~10-30 nm diameter) that impede dislocation motion through order-hardening. The gamma-prime volume fraction is approximately 8-12% -- lower than 718's ~20-25%, explaining A-286's lower absolute strength but superior weldability.
Three practical advantages:
- Iron-based (~55% Fe): Raw material cost ~half of nickel-base superalloys.
- Precipitation hardenable: Two-step aging doubles yield strength vs annealed condition.
- Forgiving heat treatment: Robust aging response across wide annealing temperature range.
Shanghai Hangbo Alloy Group supplies A-286 solution-annealed for customer aging, or fully heat-treated per AMS 5731.
Executive Standards
| Product Form | ASTM | ASME | AMS | W.Nr. |
|---|---|---|---|---|
| High-Temp Bolting | ASTM A453 Gr.660 | ASME SA-453 | - | 1.4980 |
| Bar & Forgings | ASTM A638 Gr.660 | ASME SA-638 | AMS 5731/5732/5737 | EN 10088-3 |
| Plate & Sheet | ASTM A638 | - | AMS 5525 | - |
| Welding Filler | AWS A5.14 ERNiFeCr-1 | - | AMS 5808 | - |
Chemical Composition (wt.% per AMS 5731)
| Element | Min | Max | Role |
|---|---|---|---|
| Nickel (Ni) | 24.0 | 27.0 | Gamma matrix; essential for Ni3Ti precipitate |
| Chromium (Cr) | 13.5 | 16.0 | Oxidation resistance to ~700C |
| Iron (Fe) | Balance | - | Cost-reduction element |
| 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 | Refines precipitate distribution |
| Boron (B) | 0.003 | 0.010 | Critical - improves creep ductility 2-3x |
| Carbon (C) | - | 0.08 | Grain-boundary TiC for creep resistance |
Mechanical Properties
Room-Temperature (Aged)
| Property | Value | Standard |
|---|---|---|
| Tensile Strength | >= 895 MPa (>= 130 ksi) | AMS 5731 |
| Yield Strength 0.2% | >= 585 MPa (>= 85 ksi) | AMS 5731 |
| Elongation (A5) | >= 15% | AMS 5731 |
| Hardness | 24-35 HRC | - |
Elevated-Temperature (Typical)
| Temp (C) | Tensile (MPa) | Yield (MPa) | Elongation (%) |
|---|---|---|---|
| 20 | 1000 | 690 | 22 |
| 400 | 870 | 590 | 20 |
| 550 | 780 | 540 | 18 |
| 650 | 600 | 440 | 20 |
| 700 | 400 | 300 | 25 |
Heat Treatment
Step 1 - Solution Annealing: 900-980C (1650-1795F), 1-2 hours, oil quench or water quench. Air cooling not acceptable for sections >=6 mm.
Step 2 - Precipitation Aging: 720C (1325F), 16 hours, air cool. Precipitates fine Ni3Ti particles (~10-30 nm).
Boron effect: Boron at 0.003-0.010% segregates to grain boundaries, suppressing creep. Without boron, notch sensitivity; with boron, rupture life 2-3x longer.
Industry Applications
| Industry | Typical Component | Why A-286? |
|---|---|---|
| Gas Turbines | Turbine discs, casings, bolting | ASME stress matches 718 to 650C at 50% cost |
| Jet Engines | Afterburner components, fasteners | Oxidation + strength to 700C |
| Automotive | Turbocharger wheels | Net-shape forging + single aging step |
| High-Temp Fasteners | ASTM A453 Gr.660 studs/bolts | Standard for bolting above 500C |
| Cryogenics | Superconducting magnet supports | No ductile-to-brittle transition to -269C |
| Springs | Compression springs | Retains spring temper to 650C |
Quality Assurance (7-Stage)
- Raw material purity verified by OES
- VIM melt chemistry: Ti +/-0.08%, B by ICP-OES
- Hot working: IR pyrometry, reduction >=4:1
- Solution anneal: digital chart +/-5C, quench delay <=30 sec
- Age hardening: hardness 24-35 HRC, tensile per lot
- NDE: 100% UT for bars >=50mm, PMI every piece
- EN 10204 3.1 MTC, SGS/TUV witness available
Frequently Asked Questions
Q1: What is A-286 used for?
High-temperature bolting (ASTM A453), gas turbine discs, jet engine afterburner components, turbocharger wheels, springs, and cryogenic supports -- at 40-50% lower cost than Inconel 718.
Q2: What is the density?
7.92 g/cm3 -- 6% lighter than Inconel 718.
Q3: What is the maximum service temperature?
~700C (1300F). Gamma-prime solvus at ~730C.
Q4: What is the melting point?
1370-1430C (2500-2600F).
Q5: What is the tensile strength?
>=895 MPa (>=130 ksi) aged per AMS 5731.
Q6: What is the yield strength?
>=585 MPa (>=85 ksi) aged. ~440 MPa at 650C.
Q7: How does A-286 compare to Inconel 718?
A-286: iron-based, 40-50% lower cost, 50C higher service ceiling, superior weldability. 718: nickel-based, 40% stronger at RT. Choose A-286 when temperature is the limit, 718 when stress is the limit.
Q8: What heat treatment?
(1) Solution anneal 900-980C, oil/water quench. (2) Age 720C/16h, air cool.
Q9: Is A-286 weldable?
Yes -- one of the most weldable precipitation-hardening superalloys. GTAW/GMAW with ERNiFeCr-1.
Q10: Why is boron important?
Suppresses grain-boundary creep, increasing rupture life 2-3x.
Q11: Price per kg?
$15-25/kg EXW -- 40-50% less than Inconel 718. Email sales@hangboalloy.com.
Q12: Magnetic?
Slightly magnetic. For non-magnetic, use Inconel 718.
Q13: Product forms?
Round bars (6-300 mm), bolt blanks (ASTM A453), plates (3-50 mm), forgings, wire.
Q14: International shipping?
Yes -- FOB/CIF/DAP to 40+ countries. Stock 2-4 weeks; mill 8-12 weeks.
Q15: Cryogenic service?
Yes -- FCC matrix has no ductile-to-brittle transition to -269C.
Q16: Heat-to-heat consistency?
VIM melting: Ti control +/-0.08%, tensile variation <=40 MPa.
Contact Shanghai Hangbo Alloy Group
| Channel | Details |
|---|---|
| Company | Shanghai Hangbo Alloy Group Co., Ltd. - China Supplier |
| Website | www.nickel-alloy.com |
| sales@hangboalloy.com | |
| WhatsApp (Lisa) | +86 13611656360 |
| Address | Shanghai, China |
