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GB 20 carbon seamless steel pipe. This group of Chinese (GB) standard specifications covers carbon and alloy steel plates and forgings used in boilers and pressure vessels, high-strength low-alloy steels, heat-treatable steels, hot and cold-rolled plates for cold forming, steels for concrete reinforcement and prestressed concrete and GB Standard Classification and Use of Seamless PipeGenerally, China seamless steel pipes are made of 10, 20, 30, 35, 45 and other high-quality carbon steels such as 16Mn, 5 0086-731-88739521 sales@bestarpipe EnglishGB Standard for Seamless Steel Tube.docx