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Credibility ,Alloy 20 (UNS N08020) is a nickel-iron-chromium austenitic alloy developed for maximum resistance to acid attack, particularly sulfuric acid. This super alloy has a high resistance to corrosion, crevice corrosion and pitting in chemicals containing phosphoric, sulfuric and nitric acids. It also contains niobium for stabilization against sensitization and resultant intergranular corrosion.
Alloy 20 (UNS N08020) is a combination of high corrosion resistance with mechanical properties and easy fabrication. Although designed originally to be used in sulfuric acid related industries, Alloy 20 (UNS N08020) is now a popular choice for a range of industries that include food, pharmaceutical and plastics industries. Furthermore, this super alloy is used in mixing tanks, heat exchangers, metal cleaning and pickling equipment, and piping.
The chemical composition of Alloy 20 is:
Ni | Fe | Cr | Cu | Mo | Nb | C | Mn | P | S | Si |
---|---|---|---|---|---|---|---|---|---|---|
32.00-38.00 | Balance | 19.0-21.0 | 3.0-4.0 | 2.0-3.0 | 8xC-1.0 max | .07 max | 2.0 max | .045 max | .035 max | 1.0 max |
Forms of Alloy 20 (UNS N08020) are:
The properties of alloy 20 (UNS N08020) are:
The mechanical properties of Alloy 20 (UNS N08020) are:
Form | Tensile Min. | Yield Min. (.2% offset) | Elongation Min. | Reduction of Area Min. |
---|---|---|---|---|
Bar (hot or cold finished) | 80 ksi | 35 ksi | 30% | 50% |
Sheet/Plate | 80 ksi | 35 ksi | 30% | - |
The ASTM specifications of Alloy 20 (UNS N08020) are:
Pipe Smls | Pipe Welded | Tube Smls | Tube Welded | Sheet/Plate | Bar | Forging | Fitting |
---|---|---|---|---|---|---|---|
B729 | B464 | B729 | B468 | B463 | B473 | B462 | B366 |
The applications of alloy 20 (UNS N08020) include:
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