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       Large diameter spiral steel pipe plays an important role in urban construction, water supply and drainage, power plant and other projects. Generally, the surface of large-diameter spiral steel pipe fittings shall reach near white level. With this rust removal grade, almost all oxide scale, rust and other dirt can be removed, and the depth of anchor pattern can reach 40 ~ 100 μ M fully meet the adhesion requirements between the anti-corrosion coating and the steel pipe, and the spray (throwing) derusting process can reach the near white level with low operation cost and stable and reliable quality.

        When a certain amount of rust occurs on the large-diameter spiral steel pipe, it shall be treated according to certain derusting methods and methods to ensure the quality and performance of the large-diameter spiral steel pipe, which can be used in different industries and fields and make an important contribution and role for the construction industry.

        In order to achieve the ideal derusting effect, the abrasive should be selected according to the surface hardness, original corrosion level, required surface roughness and coating type of large-diameter spiral steel pipe equipment. For single-layer epoxy, two-layer or three-layer polyethylene coating, it is easier to achieve the ideal derusting effect by using the mixed abrasive of steel sand and steel shot. Steel shot can strengthen the steel surface, while steel sand can etch the steel surface.






The mixed abrasive of steel sand and steel shot has good derusting effect even when it is used on the surface of grade C and D rusted steel.

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