Hastelloy® X
Material Data Sheet
Hastelloy® X alloy is an austenitic nickel-based alloy containing 47.5% Nickel, 22% Chromium and 18.5% Iron, with small amounts of Cobalt, Molybdenum and Tungsten for excellent resistance to oxidation at elevated temperatures.
Hastelloy® X alloy is a solid solution strengthened, offering outstanding strength at high temperatures. It has great high temperature and stress rupture characteristics above 790oC or 1450oF. It is suitable for use in applications at temperature limits about 1200oC or 2200oF. Hastelloy® X has high magnitudes of chromium, nickel, and molybdenum that offer excellent corrosion resistance properties similar to high nickel alloys more commonly in corrosion applications.
Hastelloy® X is basically known for providing high heat and oxidation resistance as well as excellent resistance to chloride stress corrosion cracking and outstanding resistance to reducing and carburizing conditions. It has been noticed to be extremely resistant to stress corrosion cracking in petrochemical applications.
Hastelloy® X has superior forming and welding properties. It is forgeable and because of its high ductility, it is easily cold worked. The work hardening rate of the alloy is similar to that of austenitic stainless steels and demonstrates good machinability in the annealed form. It is weldable by fusion and resistance welding procedures. Hastelloy® X is weldable through manual as well as automatic methods such as shielded metal arc welding, gas tungsten arc, and gas metal arc welding processes.
| Element | Content (%) |
|---|---|
| Nickel, Ni | Balance |
| Chromium, Cr | 20.50 – 23.00 |
| Iron, Fe | 17.00 – 20.00 |
| Molybdenum, Mo | 8.00 – 10.00 |
| Manganese, Mn | ≤ 1.00 |
| Silicon, Si | ≤ 1.00 |
| Aluminum, Al | ≤ 0.50 |
| Cooper, Cu | ≤ 0.50 |
| Cobalt,Co | 0.50 – 2.50 |
| Tungsten, W | 0.20 – 1.00 |
| Carbon, C | 0.05 – 0.15 |
| Titanium, Ti | ≤ 0.15 |
| Phosphorus, P | ≤ 0.04 |
| Sulfur, S | ≤ 0.03 |
| Boron, B | ≤ 0.01 |
| Properties | Metric | Imperial |
|---|---|---|
| Density | 8.22 g/cm3 | 0.297 lb/in3 |
| Melting Range | 1260 – 1355°C | 2300 – 2470°F |
| Properties | Metric | Imperial | Tensile Strength, Ultimate | 615 MPa | 89200 psi |
|---|---|---|
| Tensile Strength, Yield | 245 MPa | 35500 psi |
| Elongation at Break | 49.5 % | 49.5 % |
| Modulus of Elasticity | 205 GPa | 29700 ksi |
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