Alloy C22
Introduction :
Alloy C22, is a versatile austenitic nickel-chromium-molybdenumtungsten alloy with enhanced resistance to pitting, crevice corrosion and stress corrosion cracking. The high chromium content provides good resistance to oxidizing media while the molybdenum and tungsten content give good resistance to reducing media. This nickel alloy also has excellent resistance to oxidizing aqueous media including wet chlorine and mixtures containing nitric acid or oxidizing acids with chlorine ions.
Alloy C22 has resistance to 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. This nickel alloy 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.
Available C22 Tube Product Form
- Straight
- Coiled
- Seamless
- Seam welded and cold redrawn
- Seam welded, cold redrawn and annealed
Typical Applications for Alloy C22
- Processing Equipment
- Heat Exchangers
- Hydraulic systems
- Vessels
Industries Predominantly Using This Alloy
- Chemical processing
- Oil and gas
Typical Manufacturing Specification
- ASTM B622
- ASTM B626
- Also Individual Customer Specifications.
Chemical Composition for Allloy C22
| Element | Min | Max |
|---|---|---|
| C | 0.17 | 0.25 |
| Si | – | 0.4 |
| Mn | 0.4 | 0.7 |
| P | – | 0.045 |
| S | – | 0.045 |
| Cr | – | 0.4 |
| Cu | – | 0.5 |
| Mo | – | 0.1 |
| Ni | – | 0.4 |
Mechanical Properties for Alloy c22
| Temper | Annealed | |
|---|---|---|
| Tensile Rm | 111 | ksi (min) |
| Tensile Rm | 765 | MPa (min) |
| R.p. 0.2% Yield | 52 | ksi (min) |
| R.p. 0.2% Yield | 359 | MPa (min) |
| Elongation (2” or 4D gl) | 25 | % (min) |
Physical Properties for Alloy c22
| Properties | ||
|---|---|---|
| Specific Heat (0-100°C) | 414 | J.kg-1.°K-1 |
| Thermal Conductivity | 10.2 | W.m -1.°K-1 |
| Thermal Expansion | 6.9 | μm/μm/°C |
| Modulus Elasticity | 206 | GPa |
| Electrical Resistivity | 4.48 | μohm/cm |
| Density | 8.69 | g/cm3 |
Alloy C22 Avaliability
- Alloy C22 Seamless Pipe 1/4″ – 8″
- Alloy C22 Weld Pipe 1/2″ – 24″
- Alloy C22 Butt-Weld Fittings 1/2″ – 24″
- Alloy C22 Flanges 1/2″ – 24″
- Alloy C22 Pressure Fittings 1/4″ – 2″
- Alloy C22 150# Fittings 1/4″ – 2″
- Alloy C22 Tubing 1/4″ – 1″
- Alloy C22 Valves 1/2″ – 12″
- Alloy C22 Bar 1/8″ – 11″
- Alloy C22 Plate 1/8″ – 3″
Alloy C22 Specifications
B622, B619, B622, B626, B575, B574, B564, B366
Alloy C22 Tensile Requirements
- Tensile Strength 115
- Yield Strength 55