Description of Hastelloy X
Hastelloy X is a high temperature and corrosion resistant nickel-based solid solution strengthened alloy. This alloy has outstanding resistance to oxidation and possesses exceptional strength at elevated temperatures. Molybdenum enables this alloy to be hard, strong, and suitable for welding applications. Alloy X exhibits good formability and machinability.
lloy X is non-magnetic. It has high strength up to 1500ºF (816ºC) and good oxidation resistance up to 2200ºF (1204ºC). This alloy is especially resistant to carburization and nitriding, conditions which cause failure in some high temperature alloys. It is used extensively in high temperature jet engine and chemical processing applications and is highly resistant to stress corrosion cracking in petrochemical applications. Industrial furnace applications incorporate Alloy X for its resistance to oxidizing and its ability to maintain good ductility after prolonged exposure to extremely high temperatures.
Shape: Sheet, Plate
UNS: N06002
Specifications: ASME SB-435, AMS 5536
Chemical Component
| Element | Min | Max |
|---|---|---|
| Molybdenum | 8.00 | 10.0 |
| Chromium | 20.5 | 23.0 |
| Iron | 17.0 | 20.0 |
| Tungsten | 0.20 | 1.00 |
| Cobalt | 0.50 | 2.50 |
| Carbon | 0.05 | 0.015 |
| Silicon | -- | 1.00 |
| Manganese | -- | 1.00 |
| Boron | -- | 0.01 |
| Phosphorus | -- | 0.04 |
| Sulfur | -- | 0.03 |
| Nickel | Remainder |
Machining
Hastelloy X machining can be performed with conventional methods. Carbide tools are preferred, but high-speed steel cutting tools can also be used. Machinability is similar to that of austenitic stainless steels. The alloys is tough and, therefore, requires rigid fixturing, low cutting speeds and ample cutting fluids, either water-base or sulfochlorinated oil. Additionally, finish grinding is recommended when very close tolerances are required.
Welding
Similar to other nickel alloys we supply, such as Inco 625 & Inco 718, Hastelloy X has excellent welding ability, particularly in conjunction with gas-tungsten-arc (GTA), plasma-arc, and electron-beam welding. Generally, parent metal weld filler is used with welding carried out on solution heat treated material. Often post-weld heat treatment is employed to reduce residual weld shrinkage stresses. Strength and ductility are good in the as-welded condition, but a full post-weld solution heat treatment or lower temperature stress relief (1800F min) is often applied to obtain optimum properties (dimensional stability, fatigue life) in weldments.
Forming
Hastelloy X has very good forming ability when solution heat treated and can be cold formed by most of the common methods including drawing, rolling, bending, spinning, drop hammering, punching and shearing. The solution-treated condition is optimum for cold-forming operations because it provides minimum hardness and maximum ductility. Nevertheless, as a result of Hast X’s toughness and hardenability, relatively high energy levels and frequent intermediate solution treatments are required during severe cold forming operations. When performing simple bending operations on a brake press, Hastelloy X seldom requires lubrication. However, when performing severe forming, heavy-duty lubricants such as metallic soaps, chlorinated or sulfochlorinated oils are required. Additionally, land oil, caster oil or sperm oil lubricants are recommended for intermediate forming. Generally, after final cold working, parts should be solution treated to restore the optimum combination of mechanical properties and corrosion resistance.
Corrosion Resistance
Hastelloy X possesses excellent corrosion and oxidation resistance. It also has good sea water corrosion resistance and thus attractive for marine applications.
Heat Treatment
Hastelloy X wrought products are normally supplied by the mills in the solution heat treated condition, which provides the optimum combination of mechanical properties and corrosion resistance for practically all applications. Hastelloy X solution heat treatment consists of exposure to 2150 F followed by rapid cooling. The hold time at 2150 F varies with the section size of the product, size of load and furnace characteristics. A rule of thumb that provides acceptable results for the Haste X product being treated is to hold for 1 hour per inch of thickness. The cooling rate from 2150 to 1000 F or below should be rapid enough to prevent carbide precipitation, which decreases corrosion resistance and toughness for Hastelloy X sheet products. Rapid air cooling is adequate for this process, however, oil or water quenching is frequently necessary for heavier sections. If surface oxidation can be tolerated, the Hastelloy X solution treatment can be carried out in air or in the normal mixture of air and combustion products in gas-fired furnaces. Alternatively, oxidation can be minimized by the use of an exothermic furnace atmosphere or it can be almost entirely prevented by dry hydrogen, dry argon or vacuum atmospheres.
Forging
Hastelloy x Forging should be carried out in the temperature range of 2150 to 1750 F with relatively moderate reductions per pass. Additionally, frequent reheating is required. Hast X hot upsetting is feasible when the length to be upset is no more than three times the diameter. Impact extrusion should be carried out near the upper end of the forging temperature range.
Characteristics
- Resistant to a wide range of corrosive media.
- Virtually immune to chlorine ion stress corrosion cracking
- Non-magnetic
- Excellent mechanical properties
HASTELLOY X SHEET APPLICATIONS
Becasue of its good resistance to stress-corrosion cracking and carburization, Hastelloy X is suitable for petrochemical processing equipment and all types of forming and welding. Alloy X sheet is used for various application within the oil refining, aerospace, manufacturing, and natural gas industries. Applications within these industries include but aren’t limited to:
- Afterburner components
- Cabin heaters
- Gas turbine operations
- Aircraft parts
- Industrial furnace
- In addition to Hastelloy X sheet, XOT also stocks Hastelloy X plate, bar, and forgings.
If you want to know more about the Hastelloy X, please Contact us .