Carpenter 20

UNS N08020, 20CB-3

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.

Alloy 20 Fasteners

  • Lock Nuts
  • Set Screws
  • Dowel Pins
  • Pipe Plugs
  • Vented Screws
  • 12-Pt Flange Screws
  • Custom Fasteners


  • Plate &Sheet: ASTM B463, ASME SB463
  • Bar: ASTM B473, ASME SB473
  • Seamless Pipe & Tube: ASTM B729, ASME SB729

Material Properties

Material Properties: Alloy 20

Technical Data Sheet

Technical Data Sheet

Industries & Applications

Ready to order or have questions?

What Our Customers Are Saying About Nickel Systems

“Nickel Systems is proving to be a great supplier in our supply base.”

“Thanks for all your help. Your bolts prevented a plant shut down. I’m happy and they are extremely happy.”

“Thanks, you save me AGAIN!!! That is why YOU are the BEST! Thank you so much!”

“Thank you to you and your team, for efforts above and beyond! It is much appreciated.”