... ,X52,X56,X60,X65,X70,X High Quality Carbon Steel Drill Pipe We can produced drilling pipe(API5D,APISEPC7,API5CT) of 2-3 ... on pipe body and pipe end, magnetic particle inspection, friction welding, seam inspection. We strictly carry out API spec Q1 quality control ... All threads are machined by CNC Lathes and inspected with API Spec standard thread gauges. To improve the galling-resistance during ...