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Materials of Construction -
Metals - Alloy C-22
September 29, 2004
|
Introduction Chemical Composition Corrosion Resistance Designation Specifications Physical Properties Mechanical Properties |
Associated Links |
Alloy C-22 is a versatile nickel-chromium-molybdenum-tungsten alloy with improved resistance to both uniform and localized corrosion as well as to a variety of mixed industrial chemicals. It has excellent resistance to oxidizing aqueous media including wet chlorine and mixtures containing nitric acid or oxidizing acids with chloride ions.
Alloy C-22 has exceptional resistance to a wide variety of chemical process environments, including strong oxidizers such as ferric and cupric chlorides, chlorine, hot contaminated solutions (organic and inorganic), formic and acetic acids, acetic anhydride and seawater and brine solutions.
Chemical Composition (wt% typical)
| Nickel | Ni | Balance |
| Cobalt | Co | 2.5 max |
| Chromium | Cr | 22.0 |
| Molybdenum | Mo | 13.0 |
| Tungsten | W | 3.0 |
| Carbon | C | 0.010 max |
| Iron | Fe | 3.0 |
| Silicon | Si | 0.08 max |
| Manganese | Mn | 0.5 max |
| Vanadium | V | 0.35 max |
UNS number N06022
Alloy C-22 falls with in the composition range specified but has more restricted composition requirements which leads to improved performance of the material.
| ASME | SB-574, SB-575, SB-619, SB-622, SB-626 |
| ASTM | B-574, B-575, B-619, B-622, B-626 |
| DIN | 17744 No. 2.4602 |
| TUV Wekstoffblatt | 479 |
| NACE | MR-01-75 |
| Density | 8690 kg/m³ (542.6 lb/ft³) @ 23.9ºC (75ºF) |
| Melting Point | 1357 to 1399ºC (2475 to 2550ºF) |
| Specific Heat | 414 J/kg K (0.099 BTU/lb ºF) @ 52ºC (125.6ºF) |
| 423 J/kg K (0.101 BTU/lb ºF) @ 100ºC (212ºF) | |
| 444 J/kg K (0.106 BTU/lb ºF) @ 200ºC (392ºF) | |
| Electrical Resistivity | 1.14 microhm m (44.8 microhm in) @ 24ºC (75ºF) |
| Thermal Conductivity | 10.1 W/m K (70 BTU in/ft² h ºF) @ 48ºC (118.4ºF) |
| 11.1 W/m K (77 BTU in/ft² h ºF) @ 100ºC (212ºF) | |
| 13.4 W/m K (93 BTU in/ft² h ºF) @ 200ºC (392ºF) |
| Hardness, Rockwell | Rb 93 (sheet) Rb 95 (plate) |
| Condition | Temperature | Ultimate Tensile Strength | Yield Strength @ 0.2% offset | Elongation in 50.8 mm (2 inches) | |
| Plate (6.4 - 19.1 mm) (1/4" - 3/4") |
Heat treated @
1211ºC (2050ºF) Rapid Quenched |
204ºC (400ºF) |
675 MPa (98 ksi) | 283 MPa (41 ksi) | 66% |
| Sheet (0.71 - 3.2 mm) (0.028 - 0.125 in) |
Heat treated @
1211ºC (2050ºF) Rapid Quenched |
204ºC (400ºF) | 703 MPa (102 ksi) | 303 MPa (44 ksi) | 57% |
