Heavy Weight Drill Pipe What we produce 1, Integrated HWDP    With features: Integral heat treatment so that heat treated averagely. Integral forged that unified mechanical properties be assured   2, Friction welding HWDP which joints and pipe body produced separately. With features: 1,tool joints made separately 2,sufficient heat treatment, physical property optimized 3,easy for threading and surface treatment, more accurate on dimensional control 4,length guaranteed and tailored as per customer request   3, Integraral Spiral HWDP   Features: 1, Except the API standard steel grade of AISI 4145H, Our proprietary steel grade is obtainable 2, Proprietary designed intermediate frequency heat treatment technique to make full-length heat treating so the service life be improved. 3, CNC lathes guarantees the precise of grooves   You may choose or be advised 1, 4 kinds of hard banding can be chosen, Arnco Series hard banding,           Iron-matrix powder Alloy Tungsten Carbide Particle TCS titanium   2, Double shoulder may be obtained   3, Cold rolling on threads can be obtained