... ,API 5CT-1043, API 5L-0699 Linzhou Fengbao Pipe Co.,Ltd. as a seamless pipe manufacturer in the worldwide marketplace ... machine, eddy current inspection, ultrasonic flaw detection and also equipment for impact test, tensile test, and metallographic analysis test. ... :2008 Quality system certification and API certification get passed. Manufacturing MethodHot rolled seamlessSize (OD)Casing:4-1/2”,5 ...