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Standard GB/T8162/8163/3087/5310, ASME B36 10, ASTM A106/A53, API 5L/5CT, DIN2448/1629, EN10210/10219 Steel Grade 10#, 20#,45#,16Mn, GRB, Q345B, X42-56, ST44, ST52,S355 O.D. 73MM-610MM W.T. SCH10...