Steel surface should be no visible grease and dirt, and there is no attachment not firm scale, rust, paint and other impurities (water soluble salt and welding residue).

钢材表面应无可见的油脂和污物，并且没有附着不牢的氧化皮、铁锈和油漆涂层及其它杂质（水溶性盐和焊接残渣）。

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Steel surface should be no visible grease and dirt, and there is no attachment not firm scale, rust, paint and other impurities (water soluble salt and welding residue).

钢材表面应无可见的油脂和污物，并且没有附着不牢的氧化皮、铁锈和油漆涂层及其它杂质（水溶性盐和焊接残渣）。

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