High Quality Carbon Steel Drill Pipe 1.OD: 10. ... B,X42,X46,X52,X56,X60,X65,X70,X High Quality Carbon Steel Drill Pipe We can produced drilling ... . Regards, We are equipped with facilities of top quality in the world, such as hydraulic upset forging machine ... , walking beam quenching furnace,, hot and cold straighten device, friction welding machine, middle frequency heat treatment, numerical ...