Hastelloy C22 chemical composition
Hastelloy C22 is a corrosion-resistant Nickel-Chromium-Molybdenum alloy with added Tungsten and other elements that provide excellent performance in both oxidizing and reducing environments. It is designated under UNS N06022 and often referenced by the Werkstoff number 2.4602.
This alloy is widely used in chemical processing, pollution control, heat exchangers, and environments where corrosion resistance is critical.
Chemical Composition
Element
Composition (% by weight)
Nickel (Ni) Balance (major portion)
Chromium (Cr) 20.0 – 22.5%
Molybdenum (Mo) 12.5 – 14.5%
Tungsten (W) 2.5 – 3.5%
Iron (Fe) 2.0 – 6.0%
Cobalt (Co) ≤ 2.5%
Manganese (Mn) ≤ 0.50%
Silicon (Si) ≤ 0.08%
Vanadium (V) ≤ 0.35%
Carbon (C) ≤ 0.01 – 0.015% depending on standard
Phosphorus (P) ≤ 0.02%
Sulfur (S) ≤ 0.02%
Notes:
Nickel is the base metal and constitutes the largest proportion of the alloy.
The ranges above reflect typical compositions available per ASTM/ASME sourced references.
3. Standards & Designations
Hastelloy C22 is standardized across multiple specifications for different product forms:
UNS: N06022
Werkstoff No.: 2.4602
EN: NiCr21Mo14W (approx.)
Common ASTM/ASME standards covering C22 product forms include:
ASTM B575 / ASME SB575 – Plate, Sheet & Strip
ASTM B574 / ASME SB574 – Bars & Rods
ASTM B622 / ASME SB622 – Seamless Pipe & Tubing
ASTM B619 / ASME SB619 – Welded Pipe & Tubing
4. Why These Elements Matter
Nickel: Provides the structural matrix, ductility, and corrosion resistance.
Chromium: Adds resistance to oxidation and pitting corrosion.
Molybdenum & Tungsten: Improve resistance in reducing environments and against localized corrosion.
Low Carbon: Limits carbide precipitation in heat affected zones, improving weldability and corrosion resistance after welding.
5. How to Use This Composition Data
Material Selection: Verify materials against these composition ranges in your project specifications.
Quality Assurance: Ensure supplier material test reports show composition within these limits.
Standards Compliance: Match UNS/ASTM designations when specifying C22 for procurement.
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