High-performance alloy material for industrial engineering and critical application conditions.
1. Hastelloy X Material Introduction
Hastelloy X is a high-iron nickel-based superalloy strengthened by chromium and molybdenum. It possesses outstanding oxidation and corrosion resistance, moderate durability and creep strength below 900℃, as well as excellent hot/cold formability and weldability. It is widely manufactured into aircraft engine combustion chambers and other high-temperature components, suitable for long-term service under 900℃ and short-term working temperature up to 1080℃. Available supply forms include plates, strips, seamless tubes, bars, forgings, rings and precision castings.
2. Hastelloy X Chemical Composition
| Alloy | C | Cr | Ni | Co | W | Mo | Al | W | Fe | B | Cu | Mn | Si | P | S |
| Hastelloy X | 0.05 | 20.5 | Bal | 0.5 | 0.2 | 8.0 | – | – | 17.0 | – | – | – | – | – | – |
| 0.15 | 23.0 | 2.5 | 1.0 | 10.0 | 0.50 | 0.15 | 20.0 | 0.010 | 0.50 | 1.0 | 1.0 | 0.025 | 0.015 |
3. Hastelloy X Physical Performance
| Density | 8.3g/cm³ |
| Melting point | 1260～1355℃ |
4. Hastelloy X Mechanical Properties
Mechanical property requirements for different product forms specified in Hastelloy X standards are shown below:
| Product form | Room temperature tensile properties | 815℃ creep rupture properties | Other requirements | ||||
| σP0.2/MPa | σb/MPa | δ5/% | σ/MPa | Time t/h | Elongation δ5/% | ||
| Minimum value | |||||||
| Cold rolled thin plate Cold rolled strip Cold drawn tube Bar Ring forging Precision casting② |
310 310 310 275 275 200 |
725 760② 690 690 690 380 |
35 30① 25 30 30 10 |
110 – – 105 105 – |
24 – – 24 24 – |
8.0 – – 10.0 10.0 – |
180° bendable 180° bendable Expand & flare test HBS≤241 HBS≤241 HBS≤96 |
① For strip thickness δ<0.25mm: σb≥725MPa, δ5≥25%.
② Precision casting at 815℃: σb≥240MPa, δ5≥12%. After heat treatment at 800℃ for 50h followed by air cooling, HRC ≤24.
5. Hastelloy X Microstructure
The alloy is supplied in solid solution state with austenite matrix, plus a small amount of TiN and M6C carbides. Long-term aging at 700-900℃ mainly precipitates M12C and M3B2 phases, accompanied by trace μ and L phases. After aging at 700℃ for 200h, a small amount of σ phase appears; while after aging at 800℃, σ phase disappears, trace M23C6 precipitates and minor L phase may form. Long-term aging leads to aging hardening, reduced plasticity and decreased high-temperature strength.
Standards specify grain size of supplied cold rolled thin plate shall be Grade 4~8.
6. Material characteristics
Forming performance: The alloy has excellent hot and cold workability. Forging heating temperature: 1170℃±10℃, finish forging temperature ≥950℃; slab hot rolling heating: 1150℃±10℃, finish rolling temperature ≥850℃; ring hot rolling heating: 1170℃±10℃.
Welding performance: Good weldability, applicable for GTAW, seam welding and spot welding. Hastelloy X or HGH3113 filler wire is recommended for argon arc welding.
7. Application Field
Hastelloy X features excellent high-temperature and corrosion resistance, suitable for various high-temperature service environments with corrosive media such as chemical industry equipment.
8. Hastelloy X product specifications & delivery status
1. Product types: Custom forgings, round bars, steel plates, rings, seamless tubes, strips, welding wires in all sizes.
2. Delivery state:
Seamless tube: Solid solution + pickled bright surface, customizable length
Plate: Solid solution treated, pickled, edge trimmed
Tube: Solid solution, pickled bright + RT ultrasonic flaw detection
Forging: Solid solution + aging/annealing + machined surface
Bar: Forged, polished or machined surface
Strip: Cold rolled, solid solution soft state, deoxidized surface
Wire: Solid solution pickled coiled wire or straight wire; solid solution straight wire with fine polishing finish
