Aya dua jenis pipa baja seamless galvanized, hot-dip galvanizing (hot-dip galvanizing) jeung tiis-dip galvanizing (electro-galvanizing). Hot-dip galvanizing ngabogaan lapisan galvanized kandel, nu boga kaunggulan palapis seragam, adhesion kuat, sarta hirup layanan panjang. Sanajan kitu, cos ...
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