galvanized steel pipe : Outer diameter:21.3-219mm Wall thickness:0.4-13mm ... #, A53(A,B), A106(B,C)Thickness: 1 - 48 inchSection Shape: RoundOuter Diameter: 21 - 610 mmPlace of Origin: Hebei China (Mainland ... , USE:Petroleum,chemical,power,gas,metallurgy,shipbuilding,constructio,etc.SEAMLESS pipe : ISO 9001CERTIFICATE. BUTT WELDED FITTING: Production acc. to the standard ...