1. What is C22 Hastelloy material?
Nickel (Ni): ~60%
Chromium (Cr): ~22%
Molybdenum (Mo): ~13%
Tungsten (W): ~3%
Small amounts of cobalt (Co), manganese (Mn), silicon (Si), and carbon (C).
Exceptional resistance to pitting, crevice corrosion, and stress-corrosion cracking in harsh environments.
High tolerance to oxidizing and reducing acids, chlorides, and wet chlorine.
Good mechanical properties at both room and elevated temperatures.
2. What is C22 used for?
Chemical processing: Reactors, heat exchangers, and pipes for handling acids (e.g., sulfuric, hydrochloric, and phosphoric acids).
Petrochemical and oil refining: Equipment for processing sour gases and crude oil containing chlorides.
Waste treatment: Components in scrubbers, incinerators, and systems handling corrosive effluents.
Pharmaceutical and food industries: Equipment requiring high purity and resistance to aggressive chemicals.
Marine applications: Offshore components exposed to saltwater and chloride-rich environments.
3. What is the ASTM standard for Hastelloy C22?
ASTM B575: Standard specification for welded nickel and nickel-alloy pipe.
ASTM B574: Standard specification for nickel and nickel-alloy forgings.
ASTM B619: Standard specification for welded nickel and nickel-alloy tubes.
ASTM B576: Standard specification for nickel and nickel-alloy plate, sheet, and strip.
4. What is equivalent to Hastelloy C22 material?
ISO/EN: W.Nr. 2.4602 (NiCr21Mo14W)
UNS: N06022
DIN: 2.4602
JIS: NW6022
Hastelloy C-276 (N10276): Slightly higher molybdenum content, suitable for more severe reducing environments.
Hastelloy C-2000 (N06200): Contains copper for improved resistance to sulfuric acid.
5. What is the strength of Hastelloy C22?
Tensile strength: ≥ 730 MPa (106 ksi)
Yield strength (0.2% offset): ≥ 310 MPa (45 ksi)
Elongation at break: ≥ 40%
Hardness (Rockwell B): ≤ 95
Tensile strength: ~550 MPa (80 ksi)
Yield strength: ~240 MPa (35 ksi)
