1.seamless steel pipe ,Boiler pipe 2.OD:20mm--820mm, 1/2"--32" 3.Steel Grade: ... -1999,GB5310-1995,ASTM A106,ASTM A179ASTM A192,DIN 1629-1984,DIN 17175,BS3059.1-1987Application:structure steel pipe,boiler pipe,petroleum,gas.Our ... of managemennt:Dedicated manufacture,High quality,Dependent honesty,Best service. ASTM A179 Carbon Boiler Seamless steel pipe(1/2''-32'')