ASTM A213 T91 is a specification for seamless ferritic alloy-steel boiler tubes. It is part of the ASTM A213 standard, which covers a wide range of tubes used for high-temperature service in various .

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GB 3087 Grade 20 boiler pipes are usually made of low carbon steel, which has good weldability and mechanical properties. Grade 20 indicates its specific chemical composition and strength properties.

ASTM A335 pipes are made from various grades of ferritic alloy steel, which typically include chromium and molybdenum as key alloying elements.

ASTM A209 is a standard specification for seamless carbon-molybdenum alloy-steel boiler and superheater tubes.

The carbon content of T22 alloy pipe is less than 0.15%, and the composition also contains elements such as manganese, phosphorus, sulfur, silicon and molybdenum. The maximum hardness of this steel pipe is 163 HB, the minimum yield strength is 205MPa, and the minimum tensile strength is 415MPa.