... :1 - 80mm Brand:Tigersteel Certificate:ISO,API API 5CT carbon seamless steel pipe 1)Standard:GB, DIN, JIS, ASTM2)Grade:10 ... ,ST37,ST52,16Mn,A53-A369,API J55-API P110,Cr-Mo alloy3)OD:20 - 1,067mm Thickness:1 - 80mm4)Length:6 ... c.Boiler pipes d.Conveyance of electricity API 5CT carbon seamless steel pipe