Bar and Rod
Plate and Sheet
Strip
Pipe and Tube
Wire
Welding
Powder Material
Cast Products
Forged Products
Fittings
Fastening
Round Bar:
φ2–500 mm, 1–6 m length
Flat/Square Bar:
4–100 mm thickness/width
Hex Bar:
A/F 3–100 mm
Hollow Bar:
OD 20–300 mm
Sheet:
0.3–6 mm thickness
Medium Plate:
6–25 mm thickness
Heavy Plate:
25–100 mm thickness
Standard Strip:
0.05–3 mm thick,
10–600 mm wide
Precision strip:
0.01–0.5 mm thick,
tight tolerance ±0.005 mm
Foil:
0.005–0.1 mm thick
Seamless Tube:
OD 6–450 mm,
WT 1–50 mm,
1–12 m length
Welded Tube:
OD 10–600 mm,
WT 1–20 mm
Capillary Tube:
OD 1–10 mm,
WT 0.1–2 mm
Wire Form:
Cold Drawn Wire,
Bright Wire,
Spring Wire,
Fine Wire,
Ultra-fine Wire
General Diameter:
φ0.1–10 mm
Coil Weight:
50–500 kg,
customizable tolerance
Solid Wire:
φ0.8–4.0 mm
Flux-cored Wire:
φ1.2–4.0 mm
Welding Rod:
φ2.0–5.0 mm
Powder Form:
AM 3D Printing Powder,
Spherical Powder,
Gas-atomized Powder,
Water-atomized Powder
Particle Size:
10–150 μm
Sphericity:
≥90% for AM grade
Cast Ingot:
φ200–800 mm
Precision Casting:
min wall 0.5 mm
Cast Pipe:
OD 100–600 mm,
WT 10–50 mm
Forged Bar:
Φ35–500 mm
Forged Ring:
OD 200–2000 mm
Forging Weight:
1–5000 kg
Fittings Form:
Elbow, Tee, Reducer, Flange, Cap, Outlet, Lap Joint
Size range:
1/2''–24'' (DN15–DN600)
Wall thickness:
Sch10–Sch160, STD, XS, XXS
Pressure Class:
150–2500 LB
Fastening Form:
Bolt, Nut, Screw, Stud, Washer, Pin, Rivet
Metric: M3–M64
Imperial: #4–2.5''
Length: 6–500 mm
S66286 is a precipitation-hardenable iron–nickel–chromium austenitic superalloy with additions of titanium, molybdenum, vanadium, aluminium and boron. This datasheet presents the material within the American (ASTM / SAE-AMS / UNS) standard system.
Strengthening is achieved by precipitation of a gamma-prime [Ni₃(Ti,Al)] phase during aging, giving high strength combined with good ductility and excellent fabricability. The nickel and chromium contents provide good corrosion and oxidation resistance — its aqueous corrosion behaviour is comparable to 316L austenitic stainless steel. It retains useful strength for long-term service up to 704 °C (1300 °F), short-term to 816 °C, and intermittent to 982 °C, while remaining ductile, non-magnetic and tough down to −196 °C.
The alloy is widely used for aircraft and industrial gas-turbine components (turbine wheels, shafts, blades, vanes, afterburner parts), high-temperature fasteners and stud bolts, turbocharger wheels, and non-magnetic cryogenic equipment in petrochemical and offshore oil and gas service. It is normally supplied in the solution-annealed and aged condition.
Typical room-temperature values, solution-treated and aged condition.
| Property | Value | Unit |
|---|---|---|
| Density | 7.94 | g/cm³ |
| Melting range | 1370–1430 | °C |
| Young's modulus (20 °C) | 201 | GPa |
| Thermal conductivity (20 °C) | 12.7 | W/m·K |
| Specific heat capacity (20 °C) | 419 | J/kg·K |
| Magnetic permeability (200 Oe) | 1.0011 | Essentially non-magnetic |
| Maximum service temperature (long-term) | ~704 | °C |
| Maximum service temperature (short-term) | ~816 | °C |
| Cryogenic service capability | Down to –196 | °C |
Limiting composition per ASTM A453 Gr 660 / AMS 5732 (UNS S66286).
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Iron | Fe | Balance | — | Base element; austenitic matrix |
| Nickel | Ni | 24.0 | 27.0 | Austenite stabiliser; forms γ′ with Ti/Al |
| Chromium | Cr | 13.5 | 16.0 | Oxidation and corrosion resistance |
| Titanium | Ti | 1.90 | 2.35 | Primary γ′ [Ni₃(Ti,Al)] former; key strengthener |
| Molybdenum | Mo | 1.0 | 1.5 | Solid-solution strengthening |
| Vanadium | V | 0.10 | 0.50 | Strengthening; carbide former |
| Aluminium | Al | — | 0.35 | γ′ former; deoxidiser |
| Boron | B | 0.001 | 0.010 | Grain-boundary strengthening; creep resistance |
| Carbon | C | — | 0.08 | Controlled |
| Manganese | Mn | — | 2.00 | Deoxidiser |
| Silicon | Si | — | 1.00 | Deoxidiser |
| Phosphorus | P | — | 0.040 | Residual impurity |
| Sulphur | S | — | 0.030 | Residual impurity |
Typical properties for Grade 660 Type 2 / Class 660B, solution-treated and aged.
| Property | Value | Source |
|---|---|---|
| Ultimate tensile strength | 895 MPa (130 ksi) | Manufacturer / ASTM A453 |
| 0.2% proof strength (yield, min) | 725 MPa (105 ksi) | Manufacturer / ASTM A453 |
| Elongation at break (min) | 15 % | Manufacturer / ASTM A453 |
| Reduction of area (min) | 18 % | Manufacturer |
| Hardness | 24–35 HRC | Manufacturer |
| Charpy impact (–196 °C, min avg) | 40 J | Manufacturer |
| Tensile strength at 700 °C | ≥620 MPa | Multiple sources |
Strength is developed by solution treatment followed by aging (γ′ precipitation); a second aging treatment may be used to meet specific properties. Values are typical; confirm against the mill test certificate for each delivery.
| Environment | Performance | Notes |
|---|---|---|
| Aqueous corrosion | Good | Comparable to 316L austenitic stainless steel |
| High-temperature oxidation | Good | Useful to ~704 °C long-term; similar to Type 310 stainless |
| General atmospheric / mild media | Excellent | Cr + Ni content |
| Creep / stress-rupture | Excellent | γ′ + boron grain-boundary strengthening; key selling point |
| Sour service (H₂S) | Acceptable | Listed in NACE MR0175 / ISO 15156 (with limits) |
| Cryogenic toughness | Excellent | Retains ductility and toughness to –196 °C |
| Magnetic response | Non-magnetic | Permeability ~1.0011 |
A precipitation-hardening alloy. Strength is developed by solution treatment + aging (not by cold work).
Solution Treatment Temperature: ~900–980 °C (typical), followed by oil quench or rapid cooling Purpose: Dissolves γ′ and puts Ti/Al into solution.
Aging Temperature: ~720 °C for ~16 hours, air cool Purpose: Precipitates γ′ [Ni₃(Ti,Al)] for high strength and creep resistance. A second (double) aging treatment may be applied for specific property targets.
Supplied condition is normally hot-worked, solution-annealed and single-aged.
Weldable by conventional fusion processes; GTAW/TIG is preferred. As a γ′-strengthening alloy, it can be susceptible to strain-age cracking, so welding is generally done in the solution-annealed condition followed by post-weld solution treatment and aging to restore properties.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Good (preferred) | AWS A5.9 / A286 matching filler (AMS 5731-type) |
| GMAW / MIG | Good | AWS A5.9 / A286 matching filler (AMS 5731-type) |
| Resistance / EB / laser | Suitable | Matching/autogenous |
Post-weld solution treatment + aging is recommended for full strength; minimise restraint to avoid strain-age cracking.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Preferred condition | Solution-annealed (machine before final aging where possible) |
| Work hardening | High rate; rigid setup, positive rake, sharp tooling |
| Cutting | Low-to-moderate speed, ample feed, generous coolant |
| Coolant | Flood coolant essential |
Forming Processes
| Process | Notes |
|---|---|
| Hot working | Carried out above the solution range; rapid cool |
| Cold forming | Possible in solution-annealed condition; high work-hardening rate |
| Final aging | After forming/machining to develop full strength |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Aircraft gas turbines | Turbine wheels, shafts, blades, vanes, casings | High strength + creep resistance to 704 °C |
| Industrial gas turbines | Discs, hardware, afterburner parts | Elevated-temperature strength |
| Aerospace fasteners | Bolts, studs, high-temperature fasteners | High strength; AMS-qualified |
| Automotive | Turbocharger wheels, high-temperature fasteners | Strength + oxidation resistance |
| Oil and gas | Non-magnetic downhole tools, stud bolts | Strength + non-magnetic + sour-service (NACE) |
| Cryogenic | Non-magnetic cryogenic equipment | Toughness and strength to –196 °C |
| Product Form | ASTM Standard | AMS Standard |
|---|---|---|
| Bar (high-temp bolting) | ASTM A453 Gr 660 | AMS 5731 / 5732 / 5737 |
| Bar (general / precipitation-hardening) | ASTM A638 Gr 660 · ASTM B637 | AMS 5734 / 5853 |
| Wire | — | AMS 5731-related |
| Forgings | ASTM A453 / A638 Gr 660 | AMS 5732 |
| Plate and sheet | ASTM A453-related | AMS 5525 / 5858 |
Grade designations: 660 Type 2, Class 660B / 660D. Listed in NACE MR0175 / ISO 15156. Also known as Alloy 660.
| UNS | Ni % | Cr % | Mo % | Other | Best Used For |
|---|---|---|---|---|---|
| S66286 | 24–27 | 13.5–16 | 1.0–1.5 | Ti 1.9–2.35 | High-strength + creep to 704°C; turbine, fasteners |
| N07718 | 50–55 | 17–21 | 2.8–3.3 | Nb 4.75–5.5 | Higher strength (≥1240 MPa); turbine discs |
| N09925 | 42–46 | 19.5–22.5 | 2.5–3.5 | Ti 1.9–2.4 | Age-hardenable + sour-service (NACE) |
| N07001 | bal | 18–21 | 3.5–5 | Co 12–15 | Sustained service >700°C |
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