steel pipesteel pipe: Outer diameter:21.3-219mm Wall thickness:0.4-13mm ... , ASTMStandard: ASTM A106-2006Grade: 10#-45#, A53-A369Grade: 20#, A53(A,B), A106(B,C)Thickness: 1 - 48 inchSection Shape: RoundOuter ... , USE:Petroleum,chemical,power,gas,metallurgy,shipbuilding,constructio,etc.SEAMLESS pipe : ISO 9001CERTIFICATE. BUTT WELDED FITTING: Production acc. to the standard ...