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ISO 14788-2011 pdf free download
ISO 14788-2011 pdf free download.Continuous hot-dip zinc-5 % aluminium alloy coated steel sheet
TOles en acier revétues a chaud en continu d’alliage zinc-aluminium 5 %.
The product is normally suitable for welding, such as spot welding, roller-seam welding and fusion welding, if appropriate welding conditions are selected with special attention to the heavier coatings. When the carbon content increases above 0.15 %, spot welding becomes increasingly difficult. Because the heat of welding might have a significant effect on lowering the strength of grade 550, this grade is not recommended for welding.
Hot-dip zinc-5 % aluminium alloy coated steel sheet is a suitable base for paint, but the first treatment may be different from those used on uncoated steel. Pretreatment primers, chemical conversion coatings (chromate, phosphate or oxide type), and some paints specially formulated for direct application to zinc surfaces, are all appropriate first treatments for hot-dip zinc-5 % aluminium alloy coated sheet. In a painting schedule, It should be considered whether the product should be ordered with or without chemical passivation. Surfaces with certain passivation treatments (e.g. chromated) are not suitable for phosphating or the application of a pretreatment (etch) primer,
5.6 Surface treatment
5.6.1 Mill passivation
A chemical treatment may be applied to zinc-5 % aluminium aHoy coated steel sheet, to minimize the hazard of wet-storage stains during shipment and storage. However, the inhibiting characteristics of the treatment are limited and, if a shipment is received wet, the material shall be used immediately or dried.
Oiling of the as-produced zinc-5 % aluminium alloy coated steel sheet prevents marring and scratching of the soft surface during handling or shipping, and helps to minimize the hazard of wet-storage stains (known as white rust on this type of product). For these reasons, the purchaser is advised to consider specifying the zinc-5 % aluminium alloy coated steel in the oiled condition, provided this is compatible with his processing system.
5.7 Coated coil joining
Continuous-coil coating lines use various methods to join coil ends. These methods include lap welding, butt welding, and stitching. The shipment of coils containing the joined coil ends may be permitted if agreed upon between the manufacturer and purchaser.ISO 14788-2011 pdf free download.
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