... surface should be smooth, clean,free from blister and roughness used in anti corrosion 1. High purity ... smooth, clean, free from blister and roughness, with low oil, and the products have good mechanical property. ... area, like steel microstructure anti-corrosion, wind and electric turbines frame, bridge, sluice gate, oil pipe on ... on sea, container, electric tower frame, nodular cast iron pipe and so on