Alloy 20

Alloy 20 is an austenitic stainless steel containing less than 50% iron developed for applications involving sulfuric acid. Its corrosion resistance also finds other uses in the chemical, petrochemical, power generation, and plastics industries. Alloy 20 resists pitting and chloride ion corrosion, better than 304 stainless steel and on par with 316L stainless steel. Its copper content protects it from sulfuric acid. Alloy 20 is often chosen to solve stress corrosion cracking problems, which may occur with 316L stainless. Alloy of the same name with the designation "Cb-3" indicates niobium (also known as columbium) stabilized.^[1]^[2]^[3]

Composition

Nickel, 32–38%
Chromium, 19–21%
Carbon, 0.06% maximum
Copper, 3–4%
Molybdenum, 2–3%
Manganese, 2% maximum
Silicon, 1.0% maximum
Niobium, (8.0 X C), 1% maximum
Iron, 31–44% (balance)

Other names

UNS N08020
DIN 2.4660
CN7M
Carpenter 20 CB-3
AL 20
Carlson Alloy C20
Nickelvac 23
Nicrofer 3620 Nb, also known as VDM Alloy 20^[3]

Specifications

ASTM B729, B464, B366, B463, B473, B462, A182, A351, ASTM A743
ASME SB729, SB464, SB366, SB473, SB462,SA 182, SA351
ANSI / ASTM A555-79
EN 2.4660^[4]
UNS N08020^[4]
Werkstoff 2.4660^[4]
Castings are designated CN7M

References

^ "Alloy 20 Datasheet" (PDF). Special Metals. Archived from the original (PDF) on 12 June 2018. Retrieved 8 June 2018.
^ "Alloy 20 Datasheet" (PDF). ATI Metals.
^ ^a ^b "Alloy 20 Material Data Sheet" (PDF). VDM Metals.
^ ^a ^b ^c "Alloy 20". ASMG Trading. Retrieved 16 June 2024.

This alloy-related article is a stub. You can help Wikipedia by expanding it.

[1] "Alloy 20 Datasheet" (PDF). Special Metals. Archived from the original (PDF) on 12 June 2018. Retrieved 8 June 2018.

[2] "Alloy 20 Datasheet" (PDF). ATI Metals.

[:0-3] "Alloy 20 Material Data Sheet" (PDF). VDM Metals.

[Roll-4] "Alloy 20". ASMG Trading. Retrieved 16 June 2024.

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