Gray Steel Roof Panels

Gray Steel Roof Panels

1. Prepainted Galvalume Steel Coil

PPGL is pre-painted galvalume steel, also known as Aluzinc steel. The galvalume & aluzinc steel coil uses the cold-rolled steel sheet as a substrate and solidified by 55% aluminum, 43.4% zinc and 1.6% silicon at 600 °C. It combines the physical protection and high durability of aluminum and the electrochemical protection of zinc. It is also called aluzinc steel coil.

Advantage:

Strong corrosion resistance, 3 times that of galvanized steel sheet.

The density of 55% aluminum is smaller than the density of zinc. When the weight is the same and the thickness of the plating layer is the same, the area of the galvalume steel sheet is 3% or larger than that of the galvanized steel sheet.

Gray Steel Roof Panels Specification

Product Name	PPGL,Gray Steel Roof Panels
Technical Standard	AISI, ASTM, BS, DIN, GB, JIS3312
Material	CGCC, DX51D,Q195,Q235
Thickness	0.13-1.20 mm
Width	600-1250mm
Zinc Coating	AZ30--AZ170, Z40--Z275
Color	all RAL Colors, or According to Customers Require/Sample
Coil ID	508/610mm
Top Side	Top paint: PVDF,HDP,SMP,PE,PU; Primer paint: Polyurethance, Epoxy, PE
Back side	Back paint:epoxy,modified polyester
Surface	Glossy (30%-90%) or Matt
Coil Weight	3-8 tons per coil
Package	Standard export package or customized
Hardness	soft (normal), hard, full hard(G300-G550)
T Bend	>=3T
Reverse Impact	>=9J
Pencil hardness	>2H
Salt Spray Resistance	>=500 hours

The total thickness of the pre-painted galvalume steel coil is composed of the base steel – coating -primer – top paint – protective layer thickness. The top paint thickness is 10-25μm, and the back paint thickness is 5-20μm. The thinner the base steel thickness, the higher the price of the ppgi steel coil, because the processing cost becomes higher.

Usually the paint coating material is polyester (PE) and the color of the back paint is white grey. The color can be customized according to the RAL color card or customer samples. Special patterns can be made, such as wood grain, flower print, camouflage, brick.

PPGI Production Process Flow Chart

Unrolling → Stitching machine → Entrance loop → Pretreatment → Initial coating → Bake → Cool down → Fine coating → Bake → Embossed film → Export loop → Inspection station → Cut → Coiling

In the above process, if the cleaning degreasing process is not handled well, the adhesion of the primer of the color coated plate to the galvanized sheet is not good, and it is easy to cause the top coat of the color coated steel coil to fall off during the press forming process.

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