... ,third party inspection supported. 4,API 5CT-1043, API 5L-0699 Linzhou Fengbao Pipe Co.,Ltd. as a seamless pipe ... get passed. Manufacturing MethodHot rolled seamlessSize (OD)Casing:4-1/2”,5”,5-1/2”,6-5/8 ... 8-5/8”,9-5/8”,10-3/4”,11-3/4”,13-3/8”,16”,18-5/8”,20 ... 2-3/8”,2-7/8”,3-1/2”,4”,4-1/2”GradeH40,J55,K55,N80API ConnectionsRound thread(STC ... seamless steel pipe manufacturer Linzhou Fengbao Pipe Co.,Ltd.