About Alloy
Hastelloy S alloy (UNS N06635) is a nickel-base, high-temperature alloy with a unique combination of properties. It has excellent thermal stability, low thermal expansion and excellent oxidation resistance to 2000°F (1093°C). In addition, the alloy has good high-temperature and thermal fatigue strength. S alloy retains its strength and ductility after aging at temperatures of 800 to 1600°F (427 to 871°C).
S alloy was developed for applications involving severely cyclical heating conditions where components must be capable of retaining their strength, ductility, and metallurgical integrity after long-time exposure. It is used extensively as seal rings in gas turbine engines where its low thermal expansion coefficients is also important.
All wrought forms of S alloy are supplied in the solution heat treated condition unless otherwise specified. The standard heat-treatment is 1950°F (1066°C) followed by cooling in air or hydrogen. Since the alloy is very stable, cooling rates from slow-fumace cooling to rapid ice-brine quenching have virtually no effect on the mechanical properties.
Hastelloy S alloy can be readily forged and, because of its excellent ductility, can be cold worked. It can be welded by both manual and automatic welding methods including gas tungsten arc (GTAW), and gas metal arc (GMAW). Forging should be performed from 2100°F (1145°C) to 1600°F (871°C) up to the final 20 percent cross-section reduction. The final 20 percent reduction should be done from about 1900°F (1038°C) to 1500°F (816°C).
In summary, Hastelloy S is a high-performance alloy known for its exceptional resistance to high-temperature corrosion and oxidation, making it well-suited for applications in industrial furnaces, chemical processing, and other industries where exposure to extreme temperatures and aggressive conditions is a concern. Its versatility, reliability, and resistance to corrosion make it a valuable material for critical components in demanding industrial applications.
Product Form
AMS 5711 Bar and Forging
AMS 5838 Welding Wire
AMS 5873 Sheet, Strip and Plate
Chemical Composition
| Elements | Content (%) |
| Nickel, Ni | 67 |
| Chromium, Cr | 14.5 - 17 |
| Molybdenum, Mo | 14 - 16.5 |
| Iron, Fe | 3 |
| Cobalt, Co | 2 |
| Tungsten, W | 1 |
| Copper, Cu | 0.35 |
| Manganese, Mn | 0.30 - 1.0 |
| Silicon, Si | 0.20 - 0.75 |
| Aluminum, Al | 0.10 - 0.50 |
| Carbon, C | 0.020 |
| Phosphorous, P | 0.020 |
| Boron, B | 0.015 |
| Sulfur, S | 0.015 |
| Lanthanum, La | 0.010 - 0.10 |
Property
| Properties | Metric | Imperial |
| Tensile strength (@ 1093°C/1999°F, thickness 1.10-1.60 mm/0.0433-0.0630 in.) | 110 MPa | 16000 psi |
| Yield strength (@ 1093°C/1999°F, thickness 1.10-1.60 mm/0.0433-0.0630 in., 0.2% offset) | 52 MPa | 7540 psi |
| Elastic modulus | 212 GPa | 30700 ksi |
| Elongation at break (@ 982°C/1800°F, thickness 1.10-1.60 mm/0.0433-0.0630 in., in 50.8 mm) | 46% | 46% |
| Charpy Impact (V Notch; solution heat-treated, not aged) | 190 J | 140 ft-lb |
Application
Aerospace Applications: Such as turbine engines and jet engine components that operate under high stress and elevated temperatures.
Industrial Furnaces: Components like heat exchangers, furnace muffles, and retorts that are exposed to extreme heat and oxidizing conditions.
Heat Exchangers: Especially those used in environments where both high temperatures and corrosive fluids are present.
Chemical Processing: Equipment that requires good mechanical properties and oxidation resistance at high temperatures, such as reactors, columns, and piping for aggressive chemicals.
Power Generation: Parts for applications like high-temperature boilers and advanced steam turbines.
Nuclear Engineering: Utilized in environments where materials need to maintain structural integrity under radiation and high temperatures.
Petrochemical Industry: Components that experience high temperatures and corrosive environments, including in cracking and reforming operations.
High-Temperature Fasteners: Bolts, nuts, and other fasteners exposed to high heat and mechanical stress.
Automotive Industry: In high-performance and race-car engine components that need to operate under extreme temperatures and stress conditions.
Heat Treatment Fixtures: Components exposed to frequent heating and cooling cycles, such as baskets, trays, and other fixtures used in heat treatment processes.
LNG (Liquefied Natural Gas) Processing: Components for equipment.
Your enquiry
Can't find the information you need? Please contact us directly.