Alloy 22 / UNS N06022

Description

Corrosion Material’s Alloy 22 is a fully austenitic, nickel-chromium-molybdenum-tungsten alloy with better overall corrosion resistance compared to other nickel-chromium-molybdenum alloys, including C276, C4 and Alloy 625. The high chromium content provides good resistance to oxidizing media while the molybdenum and tungsten content give good resistance to reducing media. Some applications for Alloy 22 include waste incinerators, waste water processing, pollution control (flue-gas desulfurization), nuclear fuel reprocessing/spent fuel containers, pickling systems, chemical manufacturing, just to name a few.

Maximum service temperature for Alloy 22 is 1250°F due to the formation of detrimental phases which form above this temperature.

Resistance to Corrosion

Alloy 22 displays exceptional resistance to a broad range of corrosive environments. It has excellent resistance to oxidizing aqueous media including wet chlorine and mixtures containing nitric acid or oxidizing acids with chlorine ions. Resistance to reducing acids such as sulfuric and hydrochloric can also be expected. Other corrosive chemicals to which the alloy has resistance are oxidizing acid chlorides, wet chlorine, formic and acetic acids, ferric and cupric chlorides, sea water, brine and many mixed or contaminated chemical solutions, both organic and inorganic. Alloy 22 also offers optimum resistance to environments where reducing and oxidizing conditions are encountered in process streams. This is beneficial in multi-purpose plants where such “upset” conditions occur frequently.

Fabrication and Heat Treatment

Alloy 22 can be formed using standard processes used for Ni alloys. Although ductile enough to be formed by cold working, intermediate annealing may be necessary due to work hardening. Forging should be between be performed between 1750°F and 2050°F followed by rapid cooling. Annealing can be performed at a temperature range between 2020°F and 2150°F followed by a rapid quench. Cooling at an accelerated rate avoids the formation of detrimental phases which form between 1400°F and 1800°F. Welding can be by gas tungsten-arc, gas metal-arc, and shielded metal-arc processes.

Specifications

N08020, ASTM B473, ASME SB473, COLD DRAWN, HOT FINISHED, EN 10204-3.1

Common Trade Names

INCONEL® alloy 22, HASTELLOY® C-22® alloy

INCONEL® is a registered trademark of the Special Metals Corporation group of companies. HASTELLOY® is a registered trademark of Haynes International Inc.

Data Sheet

Chemical Composition:

Element Nickel Chromium Molybdenum Tungsten Iron Carbon Silicon
Avg. Nominal % Balance 22.0 13.5 3.0 4.0 0.015 Max 0.08 Max

Products

Alloy 22 Plate

Alloy 22 Fittings

Alloy 22 Tube

Alloy 22 Pipe

Alloy 22 Bar

Alloy 22 Sheet

Alloy 22 Fasteners

Alloy 22 Flanges

Alloy 22 Welding Product

Alloy 22 Coil

Alloy 22 Plate Shapes

Alloy 22 Custom Profiles

Alloy 22 Forgings

Alloy 22 Machined Parts

Alloy 22 Welded Components