Galvalume Steel Coil

Galvalume steel is also called Aluminum-Zinc Alloy Coated Steel, Zincalume steel, aluminized zinc steel (aluzinc steel), SGLC, The galvalume metal is composed of 55% aluminium, 43.4% zinc and 1.6% silicon solidified at 600 ~C. Its whole structure consists of aluminium-iron-silicon-zinc, forming a compact quaternary crystal alloy. The surface of the galvalume steel sheet is characterized by smooth, flat and gorgeous stars, and its base color is silver white. The special coating structure makes it have excellent corrosion resistance. The normal service life of galvalume steel sheet is up to 25a, and its heat resistance is good. It can be used in high temperature environment at 315 C. The adhesion between coating and paint film is good, and it has good processing performance. It can be punched, sheared and welded. The surface conductivity is very good.
The galvalume & aluzinc steel coil in 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 coil.
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.
 

Weight Of AI-Zn Coating

The recommended nominal Al-Zn alloy coating weight is listed in the table below. Considering the use environment of galvalume steel sheet for construction purposes, the recommended minimum nominal coating weight is 50/50 g/m².

Coating type	Recommended coating weight
Al-Zn alloy	30/30,40/40,50/50,60/60, 75/75,90/90
a: Coating mass 50g/m： equals to a coating thickness of 13.3pm approximately.

Item	Classification	Symbol
Coating type	Al-Zn alloy	AZ
Surface finish	Regular spangle	R
	Minimized spangle	M
	Skin passed	S
Surface treatment	Chromate passivated	c
	Non-chromate passivated	C5
	Chromate passivated + oiling	CO
	Non-chromate passivated+oiling	CO5
	Anti-fingerprint	N
	Non-chromate anti-fingerprint	N5
	Non-chromate high weather resistance anti-fingerprint	NW
	Oiling	0
	No treatment	U

Surface Treatment Of Galvalume Steel Sheet Aluzinc Steel Sheet Process

Decoiling – Cleaning – Annealing – Zinc pot – Cooling – Air knife – Straightening – Post-treatment – Coiling

Detailed Steps Of The Galvalume Steel Sheet Processing

Step 1:
Pre-treatment: After the cold-rolled coil arrives in the galvalume workshop, after passing through the uncoiler, through the degreasing section and the reduction furnace, the steel coil is cleaned and its components are reduced to the extent that it can be galvanized.

Step 2:
Central section: The most critical technology is this step. After passing through the zinc pot, a layer of zinc layer is plated on the surface of the steel plate. After coming out of the zinc pot, it is cooled and shaped by the cooling tower.

Step 3:
Post-processing: The steel plate finally comes to the post-processing stage after various processes. After finishing, straightening and passivation, and finally coiling.

Applications For Galvalume Steel Sheet

Construction: civil and industrial building roofs, facades, substrates for painted rolls, garage doors.
Industrial instruments: electric control cabinets, industrial freezers, vending machines.
Usually, building roofs are the most widely used.


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A: Yes, for regular sizes sample is free but buyer need to pay freight cost.