... A,B,X42,X46,X52,X56,X60,X65,X70,X High Quality Carbon Steel Drill Pipe We can produced drilling pipe( ... We are equipped with facilities of top quality in the world, such as hydraulic upset forging machine, walking beam quenching furnace,, hot ... and magnetic particle inspection. The whole process includes hot upset forging, heat treatment, hot straightening, could straightening, ultrasonic inspection on ...