Hastelloy® C-22®

Hastelloy® C-22® - Inconel® 622 - UNS N06022 - W. Nr. 2.4602 - Alloy 22 - NiCrMoW Alloy

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Table of Contents
Datasheet Chemistry
Inventory Applications
General Data Mechanical Properties
Specifications Machining, Welding, & Processing

Alloy 22, also known as HASTELLOY® C-22®, is a nickel-chromium-molybdenum alloy with enhanced resistance to pitting, crevice corrosion, and stress corrosion cracking. This alloy is resistant to the formation of grain boundary precipitates, specifically in the weld-heat affected zone. This attribute makes alloy C-22® suitable for use in the as-welded condition. C-22® has outstanding resistance to both reducing and oxidizing media. Due to these corrosion resistant properties, alloy 22 can be used where challenging conditions are likely to occur. The alloy has been proven to possess excellent weldability and high corrosion resistance as consumable filler wires and electrodes. Alloy C-22® also has proven results as a filler wire in many applications.

C-22® can easily be cold-worked because of its ductility. Cold-forming is the preferred method of forming. Cold working requires more energy during production because the alloy is stiffer than austenitic stainless steels. For comparison, a 0.28" thick sheet in the heat-treated at 2050°F, rapid quenched condition, has an average olsen cup depth of 0.49".


View or download Haynes' Hastelloy® C-22® datasheet here


Nominal Composition (Weight%)
Ni 56 Bal.
Cr 22
Mo 13
Fe 3
Co 2.5 max.
W 3
Mn 0.5 max.
Si 0.08 max.
C 0.01 max.
V 0.35 max.
Cu 0.5 max.
*Composition information provided by Haynes' datasheet on Hastelloy® C-22®, available here.

Typical Inventory

Round Bar, Loose Coil, Sheet, Plate, Tubing, Fittings


C-22 is used in severely corrosive media with high chloride and temperature applications such as buffer solutions, active pharmaceutical ingredients (API), fabric softeners, cleaning supplies, and fish, soy and chili sauce.

General Data

Alloy C-22 is a great alternative when super austenitic stainless steels (AL-6XN®, 904L, and 254 SMO®) and duplex stainless steels (2205 and 2507) will not withstand extremely aggressive media. This is because it is a nickel-chromium-molybdenum-tungsten alloy with better overall resistance to uniform and localized corrosion than any other Ni-Cr-Mo alloys such as Hastelloy C-276, C-4, and alloy 625.

  • No crevice and pitting corrosion, no product accretion.
  • Highly corrosion resistant.
  • Can be cold-worked to enhance properties.

Mechanical Properties

The typical properties listed can usually be provided in rounds, sheet, strip, plate, & custom forgings. We have the equipment to produce small quantities in special sizes to meet our customers’ specific needs.

Typical Strength & Elongation at Room Temperature
Form Ultimate Tensile Ksi (MPa) Yield Strength Ksi (MPa) Elongation %
Sheet 0.028-.0125" 116 (800) 59 (407) 57
Plate 0.25-0.75" 114 (786) 54 (372) 62
Bar 0.5-2.0" 111 (765) 52 (359) 70
Haynes' datasheet on Hastelloy® C-22®

Common Specifications

Note that the specifications listed are common for this alloy but are for reference only and may be specific to a certain form. The specifications listed are not comprehensive nor indicative of any edition, revision, or similar such as an amendment. Please, reach out to our sales department to request the Material Test Report (MTR) or to confirm your required specifications.

Form Standard
Identification UNS N06022, W. Nr. 2.4602
Bar ASTM B574, ASTM B564, ASME SB574, ASME SB564
Sheet, Plate, or Strip ASTM B575, ASTM B906, ASME SB575, ASME SB906
Pipe - Seamless ASTM B622, ASME SB622
Pipe - Welded ASTM B619, ASME SB619
Tube - Seamless ASTM B622, ASME SB622
Tube - Welded ASTM B626, ASME SB626
Fitting ASTM B366, ASTM B462, ASME SB366, ASME SB462
Forging ASTM B564, ASME SB564
Weld Wire UNS N06022/ AWS A5.14 ERNiCrMo-10/ ASME IX F-No. 43
Weld Electrode Haynes® 122/ UNS W86022/ AWS A5.11 ENiCrMo-10/ ASME IX F-No. 43


Nickel and cobalt based alloys can be difficult to machinine. However, it should be emphasized that these alloys can be machined using conventional production methods at satisfactory rates. These alloys harden rapidly, generate high heat during cutting, weld to the cutting tool surface and offer high resistance to metal removal because of their high shear strengths. The following are key points which should be considered during machining operations:

  • CAPACITY - Machine should be rigid and overpowered as much as possible.
  • RIGIDITY - Work piece and tool should be held rigid. Minimize tool overhang.
  • TOOL SHARPNESS - Make sure tools are sharp at all times. Change to sharpened tools at regular intervals rather than out of necessity. A 0.015 inch wear land is considered a dull tool.
  • TOOLS - Use positive rake angle tools for most machining operations. Negative rake angle tools can be considered for intermittent cuts and heavy stock removal. Carbide-tipped tools are suggested for most applications. High speed tools can be used, with lower production rates, and are often recommended for intermittent cuts.
  • POSITIVE CUTS - Use heavy, constant, feeds to maintain positive cutting action. If feed slows and the tool dwells in the cut, work hardening occurs, tool life deteriorates and close tolerances are impossible.
  • LUBRICATION - lubricants are desirable. Soluble oils are recommended especially when using carbide tooling.

Haynes' datasheet on Hastelloy® C-22®

Hastelloy® and C-22® are registered trademarks of Haynes International Inc.

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