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Standard for carbon steel seamless steel tubes for ships: Carbon steel seamless steel tubes for ships (GB5213-85) are used to manufacture ships' Class I pressure piping systems and Class II pressure piping systems. Now widely used.
Carbon steel seamless steel tube boilers and superheated carbon steel seamless tubes for ships . Carbon steel seamless steel pipe wall temperature does not exceed 450 °C, alloy steel seamless pipe wall temperature exceeds 450 °C.