... Quality 1.WT:4-70mm OD:25-370mm 2.Certification:API 3.Professional manufacturer ASTM A106 GR.B Carbon Steel Pipe ... ,Boiler industry16-824×2-100 Casing pipe J55 N80, P110API SPEC 5CT-- oil pipe for oil well, Coupling Cylinder60-630×1 ... .5-4.5 line pipe A5L GR.B, X52,X60 API-for petroleum,natural gas, industrial dilivery(gas,water,oil)60 ...