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Alloy 22

ASME B168, EN 2.4856, INCONEL 625

Forms

Applications

Alloy 22 Applications

Alloy 22 has a broad field of application in the chemicals and petrochemicals industry and is used for components
in organic processes that contain chloride and for catalytic systems. The material is especially effective in hot, contaminated mineral acids, solutions, organic acids (such as formic acid and acetic acid) or sea water.

Other fields of application are:

  • Acetic acid production.
  • Pharmaceuticals industry.
  • Fine chemicals.

Alloy 22 is a nickel-chromium-molybdenum alloy with tungsten and extremely low carbon and silicon content.

Alloy 22 is characterized by:

  • Extraordinary resistance across a wide range of corrosive media under oxidizing and reducing conditions.
  • Particularly high resistance to crevice, pitting, and stress corrosion.
Alloy 22 Plate Standards
Sheet, Plate B 575 SB 575 17750
17744
6208
9722
Strip B 575 SB 575 17744 18274
6280
Rod, Bar B 574
B 564
SB 574
SB 564
17744
17752
-
Wire - - 17744 -
Alloy 22 Designations
EN 2.4602 – NiCr21Mo14W
ISO NiCr21Mo14W3
UNS N06022
Alloy 22 Chemical Composition
Min 20.0 12.5 Balance 2.0 2.5 - - - - - -
Max 22.5 14.5 Balance 6.0 3.5 2.5 0.50 0.35 0.08 0.025 0.015 0.02
Alloy 22 Physical Properties
8.7 g/m3 at 20 ℃ (543 lb/ft3) at 68 ℉ 1,360 - 1,400 ℃(2,470 - 2,550 ℉) 240
Specific Heat 406/0.097 444/0.106 495/0.118 533/0.127 -/- -/-
Thermal Conductivity 9.4/65.2 13.4/92.9 19.5/135 23.2/161 -/- -/-
Electrical Resistivity 121 123 127 129 - -
Modulus Of Elasticity 206/29.9 197/28.6 178/25.8 167/24.2 150/21.8 143/20.7
Co-efficient of Thermal Expansion -/- 12.4/6.89 13.7/7.61 14.9/8.28 15.8/8.78 16.2/9.0
Alloy 22 Mechanical Properties
Yield Strength
MPa/ksi
310/45 270/39.2 195/28.3 175/25.4
Tensile Strength
MPa/ksi
690-950/100-138 -/- -/- -/-
Elongation
%
45 - - -

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WELDING

Welding Alloy 22

When welding nickel alloys and special stainless steels, the following information should be taken into account:

The generally applicable safety recommendations, especially for avoiding dust and smoke exposure must be observed.

A separately located workplace, which is specifically separated from areas in which C-steel is being processed, must be
provided. Maximum cleanliness is required, and drafts should be avoided during gas-shielded welding.

Welding Filler

The following welding filler is recommended:
  • FM 622 (mat. no. 2.4635).
  • ISO 18274 – S Ni 6022 (NiCr21Mo13Fe4W3.
  • AWS 5.14 – ERNiCrMo10.
  • ISO 18274 – S Ni 6059 (NiCr23Mo16).