... X60,X65,X70,X High Quality Carbon Steel Drill Pipe We can produced drilling pipe(API5D,APISEPC7,API5CT) of 2-3/8", ... hot upset forging, heat treatment, hot straightening, could straightening, ultrasonic inspection on pipe body and pipe end, magnetic particle inspection ... the requirements of API Specification, heat treatment is on the basis of the actual chemical analysis of each heat of steel.Strict ...