High Quality Carbon Steel Drill Pipe 1.OD: 10.3-1219.2mm 2.WT: ... ,X56,X60,X65,X70,X High Quality Carbon Steel Drill Pipe We can produced drilling pipe(API5D,APISEPC7,API5CT) of 2-3/8",2 ... Specification, heat treatment is on the basis of the actual chemical analysis of each heat of steel.Strict full-length inspection especially on the ...