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Mechanical cleaning of the surface of welded joints and the heat-affected zone of pipelines made of high-alloy and corrosion-resistant steels to a roughness of Rz 40 μm (V4) and no more than Rz 80 μm (V3) with removal of the convexity (reinforcement) of the weld, nominal pipeline diameter, 500, wall thickness up to 20 mm

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