... .seamless steel pipe ,Boiler pipe 2.OD:20mm--820mm, 1/2"--32" 3.Steel Grade:20,20G,A179,A106 B,A192 ... 1/2"- 32"Steel Grade20,20G,A 179,A106 B,A192,st37.0,st44.0,ST35.8,ST45 ... 1995,ASTM A106,ASTM A179ASTM A192,DIN 1629-1984,DIN 17175,BS3059.1-1987Application:structure steel pipe,boiler pipe,petroleum, ... ,High quality,Dependent honesty,Best service. ASTM A106 Carbon Boiler Seamless steel pipe(1/2''-32'')