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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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