... ,X46,X52,X56,X60,X65,X70,X High Quality Carbon Steel Drill Pipe We can produced drilling pipe(API5D,APISEPC7,API5CT) of 2-3 ... . Welcome your freely contact. Regards, We are equipped with facilities of top quality in the world, such as hydraulic upset forging machine ... defects. All threads are machined by CNC Lathes and inspected with API Spec standard thread gauges. To improve the galling-resistance ...