ASTM A213 tubing is a specification that covers seamless ferritic and austenitic alloy steel tubes intended primarily for use in heat-transfer equipment such as boilers, superheaters, and heat exchangers. These tubes are manufactured to withstand elevated temperatures, high pressure, and demanding service environments where thermal efficiency and structural integrity are critical. Due to their alloy composition, ASTM A213 tubes exhibit excellent mechanical strength, oxidation resistance, and corrosion resistance, making them suitable for long-term operation in harsh industrial conditions.
https://www.octalpipe.com/info/astm-a213-sa213-t9-t11-t22-t91-alloy-and-st-103219477.html