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
Hastelloy S is a nickel-based high-temperature alloy with a unique combination of thermal stability, low thermal expansion and oxidation resistance. This datasheet presents the material within the American (ASTM / ASME / UNS) standard system.
Developed for applications involving severely cyclical heating conditions, Hastelloy S retains its strength, ductility and metallurgical integrity after long-time high-temperature exposure. It combines excellent thermal stability with a low coefficient of thermal expansion and excellent oxidation resistance to about 1093 °C (2000 °F), together with good high-temperature and thermal-fatigue strength, and it retains strength and ductility after ageing at 427 to 871 °C (800 to 1600 °F). A small lanthanum (rare-earth) addition promotes oxidation resistance. Strengthening is by solid solution; the alloy is not precipitation-hardened. It is supplied in the solution heat-treated condition.
Typical applications include gas-turbine engine seal rings — where the low thermal-expansion coefficient is particularly important — and other low-stress high-temperature components; the alloy is also an excellent dissimilar-metal filler.
| Property | Value | Unit |
|---|---|---|
| Density | 8.75 | g/cm³ |
| Melting range | 1335–1380 | °C |
| Elastic modulus | 212 | GPa |
| Coefficient of thermal expansion (20–100 °C) | 11.6 | µm/m·°C |
| Thermal conductivity (20 °C) | 9.5 | W/m·K |
| Specific heat (20 °C) | 423 | J/kg·K |
| Structure | Austenitic (FCC), single phase | — |
| Element | Symbol | Min % | Max % | Role in Alloy |
|---|---|---|---|---|
| Nickel | Ni | Balance | — | Base element; high-temperature strength |
| Chromium | Cr | 14.5 | 17.0 | Oxidation resistance |
| Molybdenum | Mo | 14.0 | 16.5 | Solid-solution strengthening |
| Iron | Fe | — | 3.0 | Residual |
| Cobalt | Co | — | 2.0 | Residual |
| Tungsten | W | — | 1.0 | Solid-solution strengthening |
| Aluminium | Al | 0.10 | 0.50 | Oxidation resistance |
| Silicon | Si | 0.20 | 0.75 | Oxidation resistance |
| Manganese | Mn | 0.30 | 1.00 | Deoxidiser |
| Lanthanum | La | 0.01 | 0.10 | Rare-earth; promotes oxidation resistance |
| Carbon | C | — | 0.02 | Low; stability |
Solution heat-treated condition, typical values for UNS N06635.
| Condition | Property | Value |
|---|---|---|
| Solution annealed | Tensile strength (UTS) | ≥835 MPa (121 ksi) |
| Solution annealed | 0.2% yield strength | ≥445 MPa (65 ksi) |
| Solution annealed | Elongation at break | ≥49 % |
| After ageing (427–871 °C) | Strength / ductility | Retained |
| — | Elastic modulus | 212 GPa |
Confirm against the mill test report. The alloy retains strength and ductility after long-time exposure and ageing, which underlies its use under severely cyclical heating.
| Environment | Performance | Notes |
|---|---|---|
| High-temperature oxidation (to 1093 °C) | Excellent | Lanthanum-enhanced scale |
| Thermal cycling / thermal fatigue | Excellent | Low expansion; metallurgical stability |
| Thermal stability after ageing | Excellent | Strength/ductility retained 427–871 °C |
| Dimensional stability | Excellent | Low coefficient of thermal expansion |
| Aqueous corrosion | Moderate | Not the primary design purpose |
The combination of high chromium and molybdenum with a lanthanum addition gives excellent oxidation resistance to about 1093 °C and outstanding thermal stability and thermal-fatigue strength, making the alloy well suited to severely cyclical high-temperature service.
A single-phase solid-solution alloy; not hardenable by precipitation. Properties are set by solution annealing; hardening is by cold work.
Solution Anneal Solution anneal at approximately 1066 °C (1950 °F) followed by air cooling (or rapid cooling) to retain a uniform single-phase structure. Ageing at 538 to 871 °C (1000 to 1600 °F) restores ductility and strength after exposure. The alloy is not strengthened by precipitation; cold work raises strength.
Excellent weldability; readily welded by the gas-tungsten-arc and gas-metal-arc processes. Owing to its toughness and ductility, Hastelloy S is also widely used as an excellent dissimilar-metal filler for joining other high-temperature alloys.
| Welding Process | Applicability | Filler / Consumable |
|---|---|---|
| GTAW / TIG | Excellent | Matching S filler |
| GMAW / MIG | Good | Matching filler |
| As filler metal | Excellent | Dissimilar-metal joints |
Weld on solution-annealed material with clean surfaces; the alloy is also valued as a dissimilar-metal filler.
Machining Guidelines
| Parameter | Recommendation |
|---|---|
| Machinability | Difficult; work-hardens, rigid setups, sharp tooling |
| Speeds | Slow speeds, positive feeds, no dwelling |
| Coolant | Ample coolant |
Forming Processes
| Process | Notes |
|---|---|
| Cold forming | Easily cold worked; work-hardens |
| Hot forming | 872–1149 °C (1600–2100 °F); solution anneal afterward |
| Industry | Typical Components | Key Requirements |
|---|---|---|
| Aero gas turbine | Seal rings, low-stress hot components | Low expansion + thermal fatigue |
| Power generation | High-temperature cyclic components | Thermal stability |
| Welding | Dissimilar-metal filler metal | Ductility + stability |
| High-temperature | Components under cyclical heating | Oxidation + fatigue resistance |
| Product Form | ASTM Standard | AMS |
|---|---|---|
| Plate, sheet and strip | ASTM B435 | AMS 5711 / 5838 |
| Bar, billet and wire | ASTM B435 | AMS 5873 |
| Pipe and tube | UNS N06635 | — |
| Wrought fittings | ASTM B366 | — |
Nickel-chromium-molybdenum high-temperature alloy with lanthanum. UNS N06635.
| Alloy | Cr % | Mo % | Strengthening | Best Used For |
|---|---|---|---|---|
| Hastelloy S | 14.5–17 | 14–16.5 | Solid solution + La | Low-expansion high-temp; gas-turbine seal rings, dissimilar filler |
| Hastelloy X | 20.5–23 | 8–10 | Solid solution | High-temperature oxidation; gas turbines |
| Hastelloy N | 6–8 | 15–18 | Solid solution + M₆C | Molten fluoride salts; molten-salt reactors |
| Hastelloy C-276 | 14.5–16.5 | 15–17 | Solid solution | Reducing media, wet chlorine |
| Hastelloy W | 4–6 | 23–26 | Solid solution | Dissimilar-metal welding filler |
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