C22

Alloy C22 is an improved alloy for use in a range of aggressive industrial environments. Alloy C22 has excellent resistance to pitting and crevice corrosion in oxidizing and acid chloride environments, and is practically immune to chloride stress corrosion cracking (SCC). Alloy C22 has superior weldability, and alloy C22 weld fillers are used to join other corrosion resistant alloys such as Alloy C-276 and AL-6XN® alloy.

Chemistry

 NiCrMoMnSiCSPCuVWFe
MIN -- 20.0 12.5 -- -- -- -- -- -- -- 2.5 --
MAX balance 22.5 14.5 0.5 0.08 0.015 0.02 0.02 2.5 0.35 3.5 6.0

Specifications

ASME SB 574
ASME SB 575
ASME SB 619ASME SB 619 Class I or II
ASME SB 622
ASTM B 574
ASTM B 575ASTM B 619
ASTM B 619 Class I or IIIASTM B 622NACE MR0175UNS N06022

Inventory

C22 Forged Billet, C22 Plate, C22 Sheet, C22 Weld Wire

Common Trade Names

Alloy C22

Features

  • Better overall corrosion resistance than Alloy C-276
  • Outstanding resistance to chloride pitting, crevice corrosion and stress corrosion cracking
  • Excellent resistance to oxidizing aqueous environments (wet chlorine and mixtures containing nitric acid and chloride ions)

Applications

  • Stack liners
  • Ducts
  • Dampers
  • Scrubbers
  • Heat exchangers
  • Reaction vessels
  • Evaporators

Physical Properties

Density: 0.314 lb/in3
Melting Range: 2475-2550°F
Electrical Resistivity: 651 Ohm - circ mil/ft

Temperature, °F 32 212 392 572 752 932
Coefficient* of Thermal Expansion, in/in°F x 10-6 -- 6.0 6.0 6.2 6.4 6.5
Modulus of Elasticity Dynamic, psi x 10^6 6.4 7.1 7.7 8.4 9.2 10.0

* 70°F to indicated temperature.

Mechanical Properties

Average Tensile Data, Plate

Temperature, °F 70 200 400 600 800 1000 1200 1400
Ultimate Tensile Strength, ksi 114 107 98 95 92 88 83 76
0.2% Yield Strength, ksi 54 49 41 36 35 34 32 31
Elongation, % 62 65 66 68 68 67 69 68
Hardness MAX, HRB 95 -- -- -- -- -- -- --