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ASTM A213 T11 is the part of ASTM A213 Standard Specification for Seamless Ferritic and Austenitic Alloy-Steel Boiler, Superheater, Heat-Exchanger Tubes.

ASTM A250 alloy boiler tube is a resistance welded carbon-molybdenum and chromium-molybdenum alloy steel tube used in boilers and superheaters.

DIN 17175 12CrMo195 is a specification that covers seamless tubes of heat-resistant steels. The material 12CrMo195 is a low-alloy steel commonly used for high-temperature applications.

‌EN 10083-2 C45E‌ is a medium carbon steel with high strength and hardness. It is suitable for manufacturing some mechanical parts that require high strength and wear resistance, such as shafts, gears, hubs, etc.