白色亜鉛メッキ屋根シート

White zinc galvanized roofing sheet is a profiled steel plate that uses galvanized steel sheet to be rolled and cold-formed into various wave shapes. It is widely used as roofs, walls and interior and exterior wall decorations of civil buildings, warehouses, special buildings, large-span steel structure houses etc.

Thickness: {{0}}.11mm ~ 0.7mm

Width: 665mm ~ 1100mm

Length: 1800mm ~ 3600mm

Standard: JIS G 3302/ ASTM A653/ EN10346

Grade: SGCC/ SGCH/ TYPE A/ TYPE B/ DX51D/ DX52D/ DX53D etc.

Zinc Coating: 30g/m² ~ 275g/m²

MOQ: 5Tons

1. White rust. The surface of the white zinc galvanized roofing sheet is immersed in moisture or rain, and at a certain temperature, the zinc is oxidized to produce white powder. The anti-corrosion ability of the surface with white rust is greatly reduced, which affects its use.

2. Uneven galvanized layer. The zinc layer on the surface of the galvanized corrugated roofing sheet is uneven, uneven in thickness, and even small particles on the surface. There is excess zinc liquid on the surface of the steel coil coming out of the galvanizing pot. The excess zinc liquid is blown off with an air knife (jet high-pressure gas) to control the thickness of the zinc layer. The gas pressure of the air knife, the distance between the air knife and the steel coil, and the speed of the steel coil will directly affect the thickness of the zinc layer. If the air knife supply is unstable or the air knife pressure is insufficient, the galvanized layer will accumulate, that is zinc scars.

3. Scratches and abrasions etc. When the raw galvanized coil passes through the tension straightening machine, the straightening machine has foreign matter that causes surface scratches and abrasions.

4. Chromic acid dirt. In order to improve the corrosion resistance of the white zinc galvanized roofing sheet, a very thin passivation layer is formed on the surface of the galvanized original board, which can be completed by chromic acid treatment, that is, chromizing treatment. However, if the chromic acid treatment is poor and there is residual liquid, the surface of the galvanized sheet will appear light yellow band or stains, or even black spots.

Packing: 20 pieces staggered, covered with PVC film, moisture proof paper and steel plain sheets, upper and lower package with steel protection corners, and tighten the whole package with at least seven steel belts by machine.

On-time delivery and good after-sales service.

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