Hastelloy S™ Alloy
General Characteristics of Hastelloy S™ Alloy
Hastelloy S is a nickel-base high-temperature alloy that has excellent oxidation resistance to 2000ºF (1095ºC), along with good high-temperature and thermal fatigue strength
| Chemical Analysis | |
|---|---|
| C | Carbon 0.02 max |
| Mn | Manganese 0.30/1.00 |
| Si | Silicon 0.20/0.75 |
| Cr | Chromium 14.50/17.00 |
| Mo | Molybdenum 14.00/16.50 |
| Al | Aluminium 0.10/0.50 |
| Co | Cobalt 2.00 max |
| Cu | Coper 0.050 max |
| Fe | Iron 3.00 max |
| B | Boron .015 max |
| Ni | Nickel 67 (bal) |
Applications
This alloy was developed for conditions involving severely cyclical heating conditions where components must be capable of retaining their strength and ductility after long exposure. The alloy is used extensively in seal rings in gas turbine engines where its low coefficient of thermal expansion is also important.
Forging
Forging of Hastelloy S alloy should be carried out at 2100/1600ºF (1145/870ºC) up to the final 20% of cross-section reduction, this final 20% being carried out from about 1900ºF (1040ºC) to 1500ºF (815ºC).
Heat treatment
The alloy is solution treated at 1950ºF (1065ºC) and subsequently aged at temperatures from 800 through to 1600ºF (425 through 870ºC), where a whole range of tensile and impact properties may be obtained.
Machinability
The alloy may be machined in the annealed condition, providing the usual recommendations for high-nickel alloys are adhered to, namely positive feeds, slow speeds and rigid tools and equipment.
Weldability
The alloy may be welded by manual and automatic methods including gas-metal-arc and gas-tungsten- arc.
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