Hot Dipped Galvanized Steel Coil

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OVERVIEW OF HOT DIPPED GALVANIZED STEEL COIL

Hot-dip galvanizing refers to the process of applying a protective zinc coating to a steel sheet or iron sheet, in order to prevent rusting. As the full hard steel has undergone acid washing followed by a rolling process through the zinc pot, a layer of zinc film is applied to the sheet’s surface. Henceforth, hot dipped galvanized steel sheet in coil (GI) is produced. High quality hot dipped galvanized steel coil with reasonable price is a popular steel product with high level of corrosion resistance, paintability, and workability. It is frequently used in a broad spectrum of industries and sectors. As China hot dipped galvanized steel coil suppliersand galvanized steel sheet suppliers,Cumic is determined to supply high quality galvanized steel coilin China. Meanwhile, Cumic could give customers reasonable hot dipped galvanized steel coil price.

FEATURES OF HOT DIPPED GALVANIZED STEEL COIL

1

Thanks to the self-sacrificing characteristic of zinc, hot dipped galvanized steel coils are capable of outstanding performance in regard to anti-corrosion ability processability.

2

The galvanized steel sheet supplierand galvanized steel sheet companycan select and produce the desired amount of zinc gilded and in particular enables thick zinc layers (maximum 120g/m2).

PARAMETER OF HOT DIPPED GALVANIZED STEEL COIL

Standard	JIS / EN / ASTM Standard
Grades	SGCC/SGCD/SGCE,SGHC,SGC280GD/SGC340/SGC400/SGC440/SGC490/SGC570
	S220GD/S250GD/S280GD/S320GD/S350GD/S550GD
	SS230/SS250/SS275/SS340/SS380/SS410/SS480/SS550
	A653 CS-A/ CS-B, ASTM A653Gr.33/Gr.37/Gr.40/Gr.50/Gr.80,
	DX51D/DX52D/DX53D/DX54D/DX56D etc.
	H220PD/H300PD/H180YD/H200YD/H260YD
	H180BD/H220BD/H260BD/H300BD
	H260LAD/H340LAD/H420LAD
	DP590/DP780
Coating	Z60-Z450 or G40/G60/G90/G120/G150
Spangle	Regular spangle / Minimized spangle / Zero spangle
Sizes	Thickness:0.12mm-4.5mm Width: 900mm-1500mm

APPLICATION OF CHINA GALVANIZED STEEL COIL

Applications in the steel structure industry

Hot rolled galvanized is mainly used in the steel structure industry for light steel houses and plants, whose main building skeleton are made of galvanized cold-formed steel, mainly C-beams, Z-beams, floor bearing plates and steel guttering, with thickness specifications of mainly 1.5-3.5mm. Because of the light weight, high strength, beautiful shape, fast construction, less pollution, good wind and earthquake resistance of steel buildings, China galvanized steel coil is an environmentally friendly "green building materials".

Applications in the railroad coach manufacturing industry

The outer shell, inner shell and top and bottom plates of passenger carriages are manufactured using types of galvanized steel sheetchina. Hot-rolled galvanized sheet replaces cold-rolled sheet, simplifying the process, speeding up the manufacturing cycle and extending the service life of the vehicle. The average amount of hot-rolled gi sheet for saleused per bus is 15 tons, including 4.5 tons for 1-2.75mm. The national annual bus manufacturing capacity is about 10,000 units, and it is estimated that about 45,000 tons of hot-rolled galvanized sheet are needed.

Applications in the automotive industry

The amount of coated steel plates for automobiles in developed countries has accounted for more than 60% of the amount of thin plates, and the automobile industry in China has been developing rapidly in recent years. It is an inevitable trend to widely use galvanized sheets as auto body coverings to improve corrosion resistance. From the automotive use of galvanized sheet, its use specifications are more, the dosage is relatively large, mainly used in the bottom plate of the car, various beams, beam reinforcement plate, support, bracket and connection plate. As it is used in hidden parts, it does not require high surface quality and deep punching performance, thus some parts can be processed with hot substrate galvanized sheet instead. The specification of hot galvanized sheet for automotive consumption is mainly 1.5-3.0mm.

PRODUCTS DEVELOPMENT OF GALVANISED STEEL COIL

With the development of hot-rolled technology, the quality of galvanised steel coil products has been improving and the thickness has been gradually decreased. The use of hot-rolled sheet as raw material to produce hot-rolled galvanized sheet has replaced the traditional sheet galvanization, which has not only broadened the use of hot-rolled galvanized sheet, but also crowded out the market share of hot-rolled galvanized sheet with cold-rolled sheet as the substrate. Internationally, hot-rolled galvanized sheets have been widely adopted.

With the progress of hot rolling technology, especially the maturity of thin slab casting and rolling (CSP) technology, the thickness of hot-rolled steel strip is becoming thinner and thinner. In recent years, the country has built a number of CSP production lines. The design of the thinnest rolling specifications up to 0.8mm. CSP technology is used in large numbers, objectively for the hot-rolled galvanized plate to provide better mechanical properties and specifications of thinner hot-rolled raw materials.

PROCESS INTRODUCTION TO HOT DIPPED GALVANIZED STEEL COILS

The principle of hot dipped galvanizing is simply that a cleaned iron part is dipped into a zinc bath through the wetting action of a plating aid, and the steel reacts with the molten zinc to form an alloyed film. A good hot dip galvanizing operation is one in which all processes are under strict control and the functions of the process are thoroughly performed. Poor operation of the previous process can result in a chain of adverse reactions in the subsequent processes, which can significantly increase operating costs or result in poor hot dipped galvanized steel coils. If the pre-treatment is poor, the molten zinc will not react with the steel to form the most perfect galvanized film. If the post-treatment is poor, the appearance of the galvanized film will be damaged and the value of the product will be reduced.

ADVANTAGES OF CHINA GALVANIZED STEEL SHEET

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