Ana rong jinis pipa baja mulus galvanis, hot-dip galvanizing (hot-dip galvanizing) lan cold-dip galvanizing (electro-galvanizing). Hot-dip galvanizing nduweni lapisan galvanis sing kandel, sing nduweni kaluwihan lapisan seragam, adhesi sing kuat, lan umur layanan sing dawa. Nanging, cos ...
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