Overview
HASTELLOY Alloy S is a nickel-chromium-molybdenum superalloy containing Ni bal, Cr 16, Mo 15, and minor additions of La and B, specifically designed for high-temperature service up to 1200°C (2192°F). The rare earth lanthanum (La) addition provides exceptional oxidation resistance through the formation of a stable, adherent oxide scale, while the boron addition enhances creep resistance and high-temperature strength. The alloy is widely used in aerospace, gas turbine, and industrial heating applications where superior thermal stability and oxidation resistance are required.
Description (English)
HASTELLOY Alloy S is supplied in the sheet solution heat-treated condition, delivering yield strength of 496 MPa, tensile strength of 890 MPa, elongation of 51%, and hardness of HRB 93. The alloy is manufactured to multiple AMS aerospace standards covering bars and forgings (AMS 5711), sheet/plate/strip (AMS 5873), and wire (AMS 5838). The high tensile strength (890 MPa) combined with good ductility (51%) and exceptional oxidation resistance makes the alloy ideal for the most demanding high-temperature structural applications. HASTELLOY S is widely used in gas turbine combustion components, industrial furnace parts, and aerospace high-temperature hardware.
Size Range
- Bar: Ø 6 - 250 mm, Length up to 6000 mm
Grade Specification
| System | Value |
|---|---|
| 🇺🇸 AMS | 5711 |
Chemical Composition
| Element | Value |
|---|---|
| Ni | bal |
| Cr | 16 |
| Mo | 15 |
| Fe | 3max |
| Co | 2max |
| W | 1max |
| Mn | 0.5 |
| Si | 0.4 |
| Al | 0.2 |
| La | 0.02 |
| B | 0.015max |
| C | 0.02max |
Mechanical Properties
| productCenter.property | Value |
|---|---|
| Yield Strength (0.2% offset) | 496 MPa |
| Tensile Strength | 890 MPa |
| Elongation (in 2 in) | 51% |
| Hardness | HRB 93 |
Physical Properties
| Property | Unit | Value |
|---|---|---|
| Density | g/cm³ | 0.305 lb/cu in |
| Specific Gravity | - | 8.44 |
| Melting Point | °C | 2530 °F |
| Specific Heat (32-212°F) | J/kg·K | 0.097 Btu/lb/°F |
| Thermal Expansion Coefficient (32-212°F) | ×10⁻⁶/K | 6.5 in/in/°F × 10⁻⁶ |
| Thermal Conductivity (32-212°F) | W/m·K | 80 Btu/sq ft/hr/°F/in |
| Electrical Resistivity (68°F) | μΩ·cm | 740 ohms/cir mil ft |
| Tensile Modulus of Elasticity | GPa | 30.3 × 10⁶ psi |
Applications
- - Gas turbine combustion components
- - Industrial furnace parts and fixtures
- - Aerospace high-temperature hardware
- - Combustion liners and chambers
- - High-temperature fasteners
- Heat treatment equipment
- - Rocket engine components