API 5L X70 is a specific grade of steel pipe used in the oil and gas industry. It is part of the API 5L specification, which sets standards for the manufacturing of steel pipes for transporting fluids, such as oil, natural gas, and water.

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.