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ASTM A192 A335 A213 St37 St52 Cold Drawn 28 Inch 30 Inch Large Diameter Seamless Boiler Tubes, Find Details and Price about Boiler Water Boiler from ASTM A192 A335 A213 St37 St52 Cold Drawn 28 Inch 30 Inch Large Diameter Seamless Boiler Tubes - TIANJIN BOER KING STEEL CO., LIMITED