|
Knowledge for
the Sulphuric Acid Industry
Introduction
General
Definitions
Instrumentation
Plant Safety
Metallurgial
Processes
Metallurgical
Sulphur Burning
Acid Regeneration
Lead Chamber
Technology
Gas Cleaning
Contact
Strong Acid
Acid Storage
Loading/Unloading
Transportation
Sulphur Systems
Liquid SO2
Boiler Feed Water
Steam Systems
Cooling Water
Effluent Treatment
Utilities
Construction
Maintenance
Inspection
Analytical Procedures
Materials of Construction
Corrosion
Properties
Vendor Data
Google Search
| |
Materials of Construction - Metals - Alloy C-22
September 29, 2004
Introduction
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.
Back to top
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 |
Back to top
Corrosion Resistance
Click Here
Designation
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.
Back
to top
Specifications
| 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 |
Back to top
Physical
Properties
| 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) |
Back to top
Mechanical Properties
| 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% |
Back to top
|
