ASTM B468/ASME SB468 ALLOY 20 UNS N08020 NICKEL ALLOY SEAMLESS TUBING
Description:
Alloy 20 is a nickel-chromium-molybdenum alloy developed for applications involving sulfuric acid. Its corrosion resistance also finds other uses in the chemical, food, pharmaceutical, power generation and plastics industries. Alloy 20 nickel tubing resists pitting and chloride ion corrosion and its copper content protects it from sulfuric acid.
Typical applications include tanks, piping, heat exchangers, pumps, valves.
Typical applications: pollution control, chemical processing, pulp and paper production, and waste treatment.
Alloy 20 is a nickel–chromium–molybdenum stainless steel alloy developed for applications involving sulfuric acid. Its corrosion resistance also finds other uses in the chemical, food, pharmaceutical, power generation, and plastics industries. Alloy 20 resists pitting and chloride ioncorrosion and its copper content protects it from sulfuric acid. Alloy 20 is not a stainless steel but a nickel alloy (ASTM). Alloy 20 is often chosen to solve stress corrosion cracking problems, which may occur with 316L stainless.
It is also known as Carpenter 20. Cast versions are designated CN7M.
Stock Size Range:
OD: .125" - 1" Wall: .010 - .065
Specifications: ASTM B468, ASME SB468
Available tube product forms
Straight
Seamless
Typical Applications
Heat exchangers
Steam Generators
High temperature applications exposed to caustic solutions
Industries predominantly using this grade
Chemical processing
Nuclear and power
Oil and gas
What are the characteristics of Alloy 20?
- Excellent general corrosion resistance to sulfuric acid
- Excellent resistance to chloride stress corrosion cracking
- Excellent mechanical properties and fabricability
- Minimal carbide precipitation during welding
- Excels in resisting corrosion to hot sulfuric acids
Typical Chemical Composition %
| Nickel | 32.0-38.0 |
| Chromium | 19.0-21.0 |
| Iron | Remainder |
| Molybdenum | 2.0-3.0 |
| Sulfur | .035 max |
| Carbon | 0.07 max |
| Manganese | 2.0 max |
| Silicon | 1.00 max |
| Phosphorous | .045 max |
| Copper | 3.0-4.0 |
| Nb+Ta | 8 X C-1.0 |
Typical Mechanical Properties
| Annealed | KSI | MPA |
| Yield Strength (0.2% offset) | 35 ksi | 241 |
| Tensile Strength | 80 ksi | 551 |
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| Elongation % in 2" | 30.0 | |
Physical Properties (Room Temperature)
| Specific Heat (0-100°C) | 427 | J.kg-1.°K-1 |
| Thermal Conductivity | 9.4 | W.m -1.°K-1 |
| Thermal Expansion | 11.2 | mm/m/°C |
| Modulus Elasticity | 221 | GPa |
| Electrical Resistivity | 1.30 | μohm/cm |
| Density | 8.89 | g/cm3
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Product Tags:
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Heat Exchangers Nickel Alloy Tube Astm B468 / Asme Sb468 Alloy 20 Uns N08020 Images
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