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Mechanical cleaning of the surface of welded joints and the near-weld zone of pipelines made of high-alloy and corrosion-resistant steels to a roughness of more than Rz 20 μm (V5) and no more than Rz 40 μm (V4) with removal of the convexity (reinforcement) of the weld, nominal pipeline diameter, 350, wall thickness up to 0.394 in

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