7/27/2019 Alloy 22 Data Sheet

1/2

Corrosion Materials Alloy 22 is a fully austenitic,nickel-chromium-molybdenum-tungsten alloy withbetter overall corrosion resistance compared to othernickel-chromium-molybdenum alloys, includingC276, C4 and Alloy 625. The high chromium contentprovides good resistance to oxidizing media while themolybdenum and tungsten content give good resistanceto reducing media. Some applications for Alloy 22include waste incinerators, waste water processing,pollution control (ue-gas desulfurization), nuclear fuelreprocessing/spent fuel containers, pickling systems,chemical manufacturing, just to name a few.

Maximum service temperature for Alloy 22 is 1250F dueto the formation of detrimental phases which form abovethis temperature.

Resistance to CorrosionAlloy 22 displays exceptional resistance to a broad rangeof corrosive environments. It has excellent resistance tooxidizing aqueous media including wet chlorine andmixtures containing nitric acid or oxidizing acids withchlorine ions. Resistance to reducing acids such as sulfuricand hydrochloric can also be expected. Other corrosivechemicals to which the alloy has resistance are oxidizingacid chlorides, wet chlorine, formic and acetic acids,ferric and cupric chlorides, sea water, brine and manymixed or contaminated chemical solutions, both organicand inorganic. Alloy 22 also offers optimum resistance toenvironments where reducing and oxidizing conditionsare encountered in process streams. This is benecial inmulti-purpose plants where such upset conditions occurfrequently.

Fabrication and Heat TreatmentAlloy 22 can be formed using standard processes usedfor Ni alloys. Although ductile enough to be formed bycold working, intermediate annealing may be necessarydue to work hardening. Forging should be between beperformed between 1750F and 2050F followed by rapidcooling. Annealing can be performed at a temperaturerange between 2020F and 2150F followed by a rapidquench. Cooling at an accelerated rate avoids theformation of detrimental phases which form between1400F and 1800F. Welding can be by gas tungsten-arc,gas metal-arc, and shielded metal-arc processes.

Alloy 22UNS N06022 / W.Nr. 2.4602

Your Corrosion Alloy Specialist

ISO 9001-2008 CertiedISO Registered Since 1993

Mechanical PropertiesTypical Room Temperature Tensile Properties of Annealed Material

Product Form Tensile 0.2% Yield Elongation Hardness(ksi) (ksi) (%) (HRb)

Plate (0.25" 1.75") 112 53 62 89Sheet (0.038" 0.15") 122 63 54 93Bar (0.50" 5.50") 115 55 60 89

Cold-Worked Sheet Properties

Percent Cold Tensile 0.2% Yield Elongation Reduction (ksi) (ksi) (%)

10% 130 93 3920% 151 127 23

30% 170 151 1340% 192 174 950% 206 183 10

Density@ Room Temp. 0.314 lb/in.3

Elastic Modulus @ 70F 29.9 x 106 psiMelting Point 2475F 2550FSpecic Heat @ 126F 0.099 Btu/lbFThermal Conductivity @ 118F 70 Btuin/ft2hFPermeability @ 200 oersted (15.9 kA/m) 1.001Electrical Resistivity @ Room Temp. 44.8 m

Temperature - F Coefcient - in./in.F200 6.9400 6.9600 7.0800 7.41000 7.71200 8.1

Physical Properties

Coefcient of Thermal Expansion

CM015-04, Rev. 6

Chemical Composition

Ni ................Balance S ...............0.02 Max.Cr ............20.0 22.5 C .............. 0.015 Max.Mo ..........12.5 14.5 P .............. 0.02 Max.

W .................2.5 3.5 V ..............0.35 Max.Fe ..............2.0 6.0 Mn ........... 0.50 Max.Co .............2.5 Max. Si .............. 0.08 Max.

* - Specimens did not break.

Average Impart Strength

Product Condition V-NotchForm Impact Strength

Heat-treated Room Temp. *260 ft.-lb.Plate at 2050F,

-320F *259 ft.-lb.Rapid Quench

7/27/2019 Alloy 22 Data Sheet

2/2

Aqueous Corrosion Data

CM015-04, Rev. 6

Alloy 22 - Form ASTM ASME Stahl-Eisen-Profblatt VdTV European StandardBar B5641, B574, G28-A/B SB5641, SB574 1877 Method II 4792 EN10204 - 3.1.BPlate/Sheet/Strip A4803, B575, G28-A/B SB 575 1877 Method II 479 EN10204 - 3.1.B

Seamless Tube/Pipe B622, G28-A/B SB622 1877 Method II / EN10204 - 3.1.B

Welded Tube B626 Class III4, G28-A/B SB626 Class III4 1877 Method II / EN10204 - 3.1.BWelded Pipe B6195 Class I or II, B7756 , G28-A/B SB6195 Class I or II, SB7756 1877 Method II / EN10204 - 3.1.B

Applicable Specications

1. Applicable to 3 1/2" diameter and above. 2. Haynes International Material only. 3. Specication for atness. 4. Bead-worked and annealed. 5. Up to andincluding 8" schedule 40. 6. Above 8" schedule 40, annealed with no ller.

Media Common Name Temp. F (C) Corrosion Rate (mpy)

99% C2H4O2 Acetic Acid Boiling Nil10% FeCl3 Ferric Chloride Boiling 188% CH2O2 Formic Acid Boiling