... A,B,X42,X46,X52,X56,X60,X65,X70,X High Quality Carbon Steel Drill Pipe We can produced drilling pipe( ... , magnetic particle inspection, friction welding, seam inspection. We strictly carry out API spec Q1 quality control system and API Spec 5DP production ... inspection for raw material, magnetic particle inspection to pipe end, ultrasonic inspection on pipe body, inspection on weld seam linearity testing ...