What is the ASTM equivalent of C22 material?
Superalloys contain a variety of elements in various combinations to achieve the desired effect. They have good creep and oxidation resistance. They come in different shapes and are used at very high temperatures and mechanical stresses, and where high surface stability is required. Cobalt-based, nickel-based, and iron-based alloys are three types of superalloys. All of these can be used at temperatures above 540°C (1000°F).
Hastelloy(r) C22(r) is a nickel-chromium-molybdenum alloy. It has high corrosion resistance and metallurgical stability. It does not sensitize during heating or welding. The following datasheet provides more detailed information about Hastelloy(r) C22(r).
Chemical Composition
The following table shows the chemical composition of Hastelloy(r) C22(r).
| Element | Content (%) |
|---|---|
| Chromium, Cr | 20-22.5 |
| Molybdenum, Mo | 12.5-14.5 |
| Tungsten, W | 2.5-3.5 |
| Cobalt, Co | 2.5 min |
| Iron, Fe | 2-6 |
| Manganese. Mn | 0.5 max |
| Vanadium, V | 0.35 min |
| Silicon, Si | 0.08 max |
| Phosphorus, P | 0.02 max |
| Sulfur, S | 0.02 max |
| Carbon, C | 0.015 max |
| Nickel, Ni | Remainder |
Machinability
Hastelloy(r) C22(r) can be machined using high speed steel tools. Carbide tools are used for milling or turning. Machining operations can be performed using conventional coolants.
Forming
Hastelloy(r) C22(r) can be easily hot or cold formed and then heat treated.
Welding
Hastelloy(r) C22(r) can be welded using all welding methods except arc welding.
Heat Treatment
Hastelloy(r) C22(r) is heat treated by annealing at 1122°C (2050°F) and then quenching.
Forging
Hastelloy(r) C22(r) is hot forged at 1149°C (2100°F) and then heat treated.
Hot Working
Hastelloy(r) C22(r) has good hot working capabilities.
Cold Working
Hastelloy(r) C22(r) is capable of cold working.
Aging
Machinability
Hastelloy(r) C22(r) can be machined using high speed steel tools. Carbide tools are used for milling or turning. Machining operations can be performed using conventional coolants.
Forming
Hastelloy(r) C22(r) can be easily hot or cold formed and then heat treated.
Welding
Hastelloy(r) C22(r) can be welded using all welding methods except arc welding.
Heat Treatment
Hastelloy(r) C22(r) is heat treated by annealing at 1122°C (2050°F) and then quenching.
Forging
Hastelloy(r) C22(r) is hot forged at 1149°C (2100°F) and then heat treated.
Hot Working
Hastelloy(r) C22(r) has good hot working capabilities.
Cold Working
Hastelloy(r) C22(r) has cold working capabilities.
Aging
Hastelloy(r) C22(r) is aged at 510 to 1038°C (950 to 1900°F) to increase its tensile strength and hardness. However, if the aging temperature is above 760°C (1400°F), the V-notch impact strength may be reduced.
Hardening
Hastelloy(r) C22(r) cannot be hardened by heat treatment or cold working.
Applications
Hastelloy(r) C22(r) is used in the manufacture of different types of chemical process equipment such as:
Chlorination systems
Flue gas scrubbers
Outlet ducts and chimney linings in power plants, pulp and paper bleaching plants, sulphur dioxide scrubbers and weld overlays on metals with poor corrosion resistance
Acid production and pickling systems.
