Grade D Sucker Rod is made of fine alloy steel. It is featured by high strength,
            better plasticity and long service life after heat treatment. It is suitable for the             deeper oil well in the non-corrosion or light-corrosion medium. Super-high             strength sucker rod newly developed by our company is made of the special alloy             steel.

            This kind of rod has the same size, structure and parameters as Grade D sucker             rod except having higher strength.Its strength can exceed 965 Mpa but its
            plasticity is not lowered. Super-high strength sucker rodis used for deep oil well             and big-pump capacity oil well in the non-corrosion or light-corrosion environment.

            Before manufacture, the advanced spectrometer is applied for conducting material             analysis. , During manufacture, the magnetic leakage detector is used to defect             steel pipe one by one. In the course of calcinations, the infrared thermometer is             used to monitor the heating temperature. Then the steps are thermal insulation,             air-hast or quenching. After auto control heating & straightening, the impeller             cleaning is applied along surface, for the purpose of increasing product’s             endurance strength. The head of sucker rods will be painted automatically after             processed by autoimmunization lathe to guarantee the product quality. During             whole process, there are integral quality control measures.