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Alloy 22

A nickel-chromium-molybdenum grade, Alloy 22 exhibits excellent resistance to both oxidising and reducing environments.

With the addition of tungsten, alloy 22 provides exceptional resistance to pitting and crevice corrosion, in oxidising acid halide environments.

Inventory

Product FormSize range fromSize range to
Alloy 22 welding wire0.89 mm3.175 mm GET A QUOTE
Alloy 22 sheet & plate0.96 mm50.8 mm GET A QUOTE
Alloy 22 round tubing6.35 mm50.8 mm GET A QUOTE
Alloy 22 round bar3.175 mm279.4 mm GET A QUOTE
Alloy 22 pipe0.375 in8 in GET A QUOTE
Alloy 22 pipe fittings0.375 in8 in GET A QUOTE
Alloy 22 flanges0.375 in8 in GET A QUOTE

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Pipe

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Pipe Fittings

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Flanges

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Welding Consumables

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Sheet & Plate

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Round Bar

Chemical Analysis

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

Applications

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Perfect for applications in the Chemical Processing Industry

Alloy 22 can be used in a variety of applications, here are just a few examples:

  • Reactors and pressure vessels
  • Nutsche pressure filters
  • Centrifugers and dryers
  • Agitators and mixers
  • Containment vessels and glove boxes
  • Pollution control equipments
  • Flue gas desulphurisation (FGD) lined ducts and dampers

About Alloy 22

Due to its high nickel content, Alloy 22 is immune to chloride-induced stress corrosion cracking.

The alloy demonstrates outstanding resistance to pitting and crevice corrosion particularly in high chloride containing environments.

Alloy 22 has exceptional resistance to a large range of chemical process environments, including ferric chlorides, chlorine, hot contaminated solutions, acetic acids, seawater and brine solutions. Alloy 22 is the ideal choice when considering alloys for use in extreme corrosive environments.

If you require any additional information on this alloy, then please don’t hesitate to contact us.

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

Specifications

UNS Number:
N06022
W.Nr.Number:
2.4602
ASTM Standards:
B366, B462, B564, B574, B575, B619, B622, B626, B775
ASME Standards:
SB366, SB574, SB619, SB622, SB626, SFA5.14 (ERNiCRMo-10)
Download the Alloy 22 Data Sheet Download

FAQs & Resources

Austenitic stainless steels and Nickel-based alloys have an austenite crystalline structure (γ-Fe) which is face-centred cubic (FCC). In this alloy the austenitic structure can be achieved by adding stabilising elements such as Nickel, Manganese and Iron into their solid solution. The addition of these elements, especially Nickel, improves the metallurgical stability, thermal stability and weldability. There is between 8-80% Nickel present in all austenitic heat resistant alloys. It helps reduce sigma formation. Nickel also improves, resistance to reducing acids and caustics, improving its performance against stress corrosion cracking particularly in chlorides and caustics.

Many producers in the Pharmaceutical and Bio Synthetic industries have chosen to replace glass vessels, GRP (glass reinforced plastic) lined vessels, glass lined vessels, flouroshield lined vessels and stainless steel vessels with alloy 22 vessels. Due to the following reasons, alloy 22 is the alloy of choice for pressure vessels, reactors, Nutsche pressure filters, centrifuges, dryers, glove boxes, containment vessels etc.

  • Used for the manufacture of multiple products rather than dedicated plants.
  • Eliminates costs of repair and down time of glass lined vessels (Tantalum patches).
  • Significantly improves heat transfer due to a general reduction in the wall thickness of process equipment, resulting from the increased strength of alloy 22, and thus leading to improved plant efficiency & product yields.
  • Eliminates problems associated with fluorine attack on glass process equipment.
  • Significantly reduces contamination & colouration of the end products.
  • Reduce plant outages and maintenance costs
  • Suitable fro use in the 'as-welded' condition due to its resistance to the formation of grain boundary precipitates (inter-metallic carbides) in the weld heat affected zone (HAZ).

Alloy 22 exhibits excellent corrosion resistance especially in oxidising conditions mainly due to its high Chromium and Nickel content. Moreover, the addition of Molybdenum and Tungsten give the alloy outstanding resistance to pitting and crevice corrosion. Alloy 22 is used in a wide variety of chemicals including oxidising acid chlorides, wet chlorine formic acids , acetic acids, ferric chlorides, cupric chlorides, sea water, brine and other mixed or contaminated chemical solutions (both organic and in-organic) where nitric acid or high levels of chlorides are present. With the Nickel content significantly higher than 40%, the alloy is immune to chloride induced stress corrosion cracking.

Yes, alloy 22 can be used for weld overlay applications because it demonstrates excellent thermal stability characteristics and resists the formation of grain boundary precipitates (inter-metallic carbides). Based on this alloy 22 is widely used as universal filler wire and weld overlay on lower grade materials to improve corrosion resistance.

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