Alloy 20
Chemical Composition %
| C | Cb | Cr | Cu | Mn | Mo | Ni | P | S | Si | Ta |
|---|---|---|---|---|---|---|---|---|---|---|
| Max | 8 times | Max | Max | Max | Max | 8 times | ||||
| 0.07 | Carbon - 1.00 | 19.0-21.0 | 3.0-4.0 | 2.0 | 2.0-3.0 | 32.0-38.0 | 0.045 | 0.035 | 1.0 | Carbon - 1.00 |
Availability
- Seamless Pipe 1/2" - 8"
- Weld Pipe 1/2" - 12"
- Butt-Weld Fittings 1/2" - 12"
- Flanges 1/2" - 12"
- Pressure Fittings 1/2" - 2"
- 150# Fittings 1/4" - 2"
- Tubing 1/4", 3/8", 1/2"
- Valves 1/2" - 12"
- Bar 1" - 8"
Specifications
- ASTM
- B729, B464, B366, B473, B462
- ASME
- SB729, SB464, SB366, SB473, SB462
Description
Alloy 20 is one of the so-called "Super" stainless steels that was designed for maximum resistance to acid attack. It's nickel, chromium, molybdenum and copper content contribute to its overall resistance to chlorideon stress corrosion cracking and general pitting attack. The alloy is stabilized with columbium to minimize carbide precipitation during welding. It has good mechanical properties and can be fabricated with comparative ease. Athough the alloy was designed for use in sulfuric acid related industries, it finds wide usage throughout the chemical processing industry. It also is used for processing pharmaceuticals, food, gasoline, solvents, plastics, explosives, synthetic fibers and many other products.
Design Features
- Superior resistance to stress-corrosion cracking in boiling 20 to 40% sulfuric acid.
- Excellent general corrosion resistance to sulfuric acid.
- Excellent resistance to chloride stress corrosion cracking.
- Excellent mechanical properties and fabricability.
- Minimal carbide precipitation during welding.
Typical Applications
- Chemical and allied industries
- Food and dye production
- Heat exchangers
- SO 2 scrubbers and other severe environments
- Tanks
- Pickling racks
- Valves
Tensile Requirements
- Tensile Strength (KSI) 80
- Yield Strength (KSI) 35KSI can be converted to MPA (Megapascals) by multiplying by 6.895.