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Carbon and carbon-manganese steel seamless steel tubes and pipes for shipGB/T5312
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Seamless steel tubes for structural purposeGB/T8162
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Cold-drawn or cold-rolled precision seamless steel tubesGB/T3639
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Seamless steel tubes for high-pressure for chemical fertilizer equipementsGB/T6479
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Seamless steel tubes and pipes for high pressure boilerGB/T5310
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Seamless steel tubes for low and medium pressure boilerGB/T5310
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Seamless steel tubes for liquid serviceGB/T8163
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Seamless steel tubes for petroleum crackingGB/T9948
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Seamless medium carbon steel boiler and superheater tubes ASTM A210