NeoNickel

Alloy 22

A nickel-chromium-molybdenum-tungsten alloy, Alloy 22 offers outstanding corrosion resistance in highly aggressive environments across a wide range of industries.

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Characteristics of Alloy 22

Alloy 22, also known as Hastelloy® C-22 and Inconel® 22, is a high-performance corrosion-resistant alloy made from nickel, chromium, molybdenum, and tungsten.

It offers outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC), even in highly aggressive chloride-rich and acidic environments. Engineered to perform in both oxidising and reducing conditions, Alloy 22 is trusted across chemical processing, marine, aerospace, and pollution control industries.

  • Exceptional corrosion resistance in oxidising and reducing environments, resisting ferric chlorides, hydrochloric acid, seawater, and brine solutions.
  • High mechanical strength maintained at elevated temperatures.
  • Outstanding resistance to pitting, crevice corrosion, and stress corrosion cracking (SCC).
  • Excellent weldability and fabrication flexibility.
  • Long-term durability in highly aggressive service environments.
  • UNS Number: N06022
  • Werkstoff Number: 2.4602
  • ASTM: B564, B574, B575, B619, B622, B626, B366, B462, B775

Product availability

We stock Alloy 22 in a variety of product forms to suit different applications and fabrication methods, including coil, coiled weld wire, flanges, seamless pipe, welded pipe, pipe fittings, plate, round bar, round tube, sheet and welding wire. To view available sizes and submit an inquiry, use the dropdown selector below.

To view available sizes and submit an enquiry, use the dropdown selectors below.
Coil
4 Products
Coiled Weld Wire
1 Product
Flanges
1 Product
Pipe (Seamless)
7 Products
Pipe (Welded)
59 Products
Pipe Fittings
1 Product
Plate
44 Products
Round Bar
83 Products
Round Tube
71 Products
Sheet
24 Products
Welding Wire
9 Products

Chemical analysis

%NiCrMoFeWCoCMnSiVPS
MinBalance2012.522.5-------
Max-22.514.563.52.50.0150.50.080.350.020.02

Key Properties

  • Density: 8.61g/cm³
  • Melting Range: 1351-1387°C
  • Hardness: 89 HRB
  • Specific Heat Capacity: 381 J/kg.°C
  • Electrical Resistivity: 1.215µΩ.m
  • Curie Temperature: < -196°C
  • Poisson's Ratio: 0.3

Mechanical & Physical Properties

Mechanical & Physical Properties-196⁰C20⁰C100⁰C200⁰C300⁰C400⁰C
Ultimate Tensile Strength for sheet ≤ 50 mm thick690-950
Ultimate Tensile Strength for bar ≤ 90 mm thick690-951
0.2% Yield Strength for sheet ≤ 50 mm thick310270225195175
0.2% Yield Strength for bar ≤ 90 mm thick310290245215195
Elongation, % for sheet ≤ 50 mm thick45
Elongation, % for bar ≤ 90 mm thick45
Charpy Impact V-notch men value / J96120
Thermal Conductivity 10.111.113.415.517.5
Modulus of Elasticity / 105MPA2.051.971.85

Aqueos Corrosion Data

MediaCommon NameTemp. °F (°C)Corrosion Rate (mpy)
99% C2H4O2Acetic AcidBoilingNIL
10% FeCl3Ferric ChlorideBoiling1
88% CH2O2Formic AcidBoiling<1
1% HClHydrochloric AcidBoiling3
5% HClHydrochloric Acid158 (70)19
10% HClHydrochloric AcidBoiling400
5% HCl + 42 g/l Fe2(SO4)3Mixed Acid150 (66)2
5% HCl + 2% HFMixed Acid158 (70)59
5% HFHydrofluoric Acid158 (70)14
85% H3PO4Phosphoric AcidBoiling13
44% P2O5Phosphoric Oxide240 (116)21
38% P2O5 + 2000ppm ClMixed Acid185 (85)1
38% P2O5 + 0.5% HFMixed Acid185 (85)7
10% HNO3Nitric AcidBoiling<1
65% HNO3Nitric AcidBoiling134
5% HNO3 + 6% HFMixed Acid140 (60)67
5% HNO3 + 25% H2SO4 + 4% NaClMixed AcidBoiling12
5% HNO3 + 1% HClMixed AcidBoiling<1
5% HNO3 + 2.5% HClMixed AcidBoiling2
8.8% HNO3 +15.8% HClMixed Acid126 (52)4
2% H2SO4Sulphuric AcidBoiling5
10% H2SO4Sulphuric AcidBoiling12
20% H2SO4Sulphuric AcidBoiling33
50% H2SO4Sulphuric Acid174 (79)16
80% H2SO4Sulphuric Acid199 (93)68
10% H2SO4 + 1% HClMixed Acid194 (90)94
25% H2SO4 + 200 ppm Cl-Mixed Acid158 (70)11
23% H2SO4 + 1.2% HCl + 1% FeCl3 + 1% CuCl2ASTM G28BBoiling8
50% H2SO4 + 42g/l Fe2(SO4)3ASTM G28ABoiling40

Applications of Alloy 22

Due to its unparalleled corrosion resistance and high mechanical strength, Alloy 22 is widely utilised in demanding industrial applications, including:

Chemical Processing Industry

  • Reactors & Pressure Vessels – Handles highly corrosive chemicals and extreme temperatures
  • Piping Systems & Heat Exchangers – Long-term performance in harsh environments

Aerospace & Defense

  • Jet Engine Components & Exhaust Systems – High-temperature oxidation resistance
  • Containment Vessels & Glove Boxes – Protection against chemical exposure

Marine & Offshore Engineering

  • Seawater Cooling Systems – Exceptional resistance to saltwater corrosion
  • Subsea Equipment & Piping – Long-term durability in high-pressure environments

Pollution Control & Environmental Technologies

  • Flue Gas Desulphurisation (FGD) Systems – Resistance to acidic emissions
  • Scrubbers & Waste Treatment Units – Ensures durability in corrosive waste disposal

With its proven performance and durability, Alloy 22 is the preferred choice for industries operating under extreme conditions.

Benefits of Choosing Alloy 22

Alloy 22 offers a powerful combination of corrosion resistance, mechanical strength, and fabrication flexibility, making it an excellent choice for critical applications across numerous sectors.

  • Extends Equipment Life: Exceptional corrosion resistance reduces material degradation, extending service intervals and component lifespan.
  • Reliability and Safety: Provides dependable performance in highly corrosive and extreme environments, improving operational reliability and safety.
  • Cost-Efficient Maintenance: Superior material durability reduces maintenance frequency and lowers long-term operational costs.
  • Versatile Industry Applications: Supports a wide range of sectors, including chemical processing, marine engineering, pharmaceutical manufacturing, aerospace, and pollution control.
  • Flexibility in Fabrication: Excellent weldability and formability simplify production processes and enhance design flexibility.

Alloy 22 is the ideal material solution for industries requiring proven long-term protection, operational efficiency, and reduced maintenance demands. For further advice or to request a quote, contact our team today.

Proud members of the British Valve & Actuator AssociationProud members of the British Valve & Actuator Association