| Customization: | Available |
|---|---|
| Application: | Aviation, Electronics, Industrial, Medical, Chemical |
| Standard: | JIS, GB, DIN, BS, ASTM, AISI |
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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).
The chemical composition of HASTELLOY(r) S alloy is outlined in the following table.
| Weight % | |
| Nickel | 67 Balance |
| Cobalt | 2 max. |
| Chromium | 16 |
| Molybdenum | 15 |
| Iron | 3 max. |
| Silicon | 0.4 |
| Manganese | 0.5 |
| Carbon | 0.02 max. |
| Aluminum | 0.25 |
| Boron | 0.015 max. |
| Lanthanum | 0.02 |
| Tungsten | 1 max. |
| Grade | UNS | DIN | EN | AMS | ASTM | JIS | |
| Hastelloy S |
N06635 |
|
AMS 5711
AMS 5838
AMS 5873
|
- | |||
The following table shows the physical properties of Hastelloy S.
| Properties | Metric | Imperial |
| Density | 8.75 g/cm³ | 0.316 lb/in³ |
| Melting point | 1360°C | 2480°F |
The mechanical properties of Hastelloy S are given in the following table.
| 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 |
The thermal properties of Hastelloy S are displayed in the following table.
| Properties | Metric | Imperial |
| Thermal expansion co-efficient (@ 20-93°C/68- 99°F) | 11.5 µm/m°C | 6.39 µin/in°F |
| Thermal conductivity (@ 200°C/392°F) | 14.0 W/mK | 97.2 BTU.in/hr.ft².°F |
Hastelloy S is widely used in gas turbine engines because of its outstanding high-temperature performance and minimal thermal expansion. The alloy is valued for maintaining strength and structural integrity under the cyclical heating typical in gas turbines, making it ideal for components like seal rings, which benefit from its thermal stability and oxidation resistance. This ensures reliable performance and longevity, critical for the efficiency and safety of gas turbine operations.
In chemical processing, Hastelloy S is preferred for equipment that faces corrosive environments and high temperatures. Its excellent resistance to pitting and crevice corrosion makes it ideal for reactors, heat exchangers, and pipes handling aggressive chemicals, ensuring the safety and efficiency of chemical processes. The alloy's ability to withstand harsh environments without degrading is crucial for maintaining operational integrity and reducing maintenance costs.
The pharmaceutical industry requires materials that resist corrosion and maintain hygiene. Hastelloy S meets these needs with its broad corrosion resistance and high-temperature stability, making it ideal for pharmaceutical manufacturing equipment where product purity and contamination prevention are crucial. The alloy's durability and reliability allow it to withstand the rigorous cleaning and sterilization processes common in this industry, ensuring consistent performance and safety in pharmaceutical production.
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