... ,Gr320Executive StandardGB3087-1999,GB5310-1995,ASTM A106,ASTM A179ASTM A192,DIN 1629-1984,DIN 17175,BS3059.1-1987Application:structure steel pipe,boiler pipe,petroleum ... of managemennt:Dedicated manufacture,High quality,Dependent honesty,Best service. ASTM A192 Carbon Boiler Seamless steel pipe(1/2''-32'')