Alloy 20, also known as "Carpenter 20" and "20CB-3", was developed by Carpenter Technology as an upgrade to 316 Stainless. It is classified as a super-austenitic due to iron being its most abundant component. The UNS system classifies it as nickel-based alloy even though its nickel content is less than half. Alloy 20 resists hot sulfuric acid. It is often found in chemical mixers and fertilizer manufacturing equipment. Generally, it is an economical alternative to Alloy C276 and other higher nickel content materials.
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