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Mechanical cleaning of welded joints and heat-affected zones of pipelines made of high-alloy and corrosion-resistant steels to a roughness of more than Rz 20 μm (V5) and not more than Rz 40 μm (V4) without removing the convexity (reinforcement) of the weld, nominal pipeline diameter: up to 15, wall thickness up to 3 mm

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