Galvannealed Sheet Description

Galvannealed Steel Sheet is a sheet material made by hot-dip galvanizing and subsequent annealing process. It combines the advantages of galvanized steel and annealing process, has high corrosion resistance and good surface treatment ability, and is widely used in automobile manufacturing, construction, home appliances and other fields.

After the GI steel plate is hot-dip galvanized, the iron and zinc in the coating are diffused into each other by heating and annealing to form an iron-zinc alloy layer. This alloy layer enhances the strength and hardness of the material while improving the surface machinability, such as welding and painting performance.

Galvanized Coil Specification

Standard: JIS G3302, ASTM A653M/A924M, EN10327,etc

Grade: SGCC, DX51D, S350GD, S550GD, CS type A, etc

Thickness: 0.10mm-6.0mm

Width: 600mm-1500mm, or as per client’s request

Spangle: Big, Regular, Minimized, Zero

Surface treatment: Passivation, Oiled, Passivation+Oils, Skin-Pass, etc

Zinc coating: Z40-Z275

GI Sheet Thickness

Galvanized Coil Surface Structure:Small,Large,Zero.Select as per your requirement

Zinc Spangle is a surface morphology of hot-dip pure zinc coil, when the steel strip passes through the zinc pot, the surface is coated with liquid zinc, and then in the process of natural solidification of the zinc layer, the zinc grain nucleus grows and zinc spangle appears.The surface of the hot-dip pure galvanized coils produced had zinc sparks of various sizes and shapes.

Galvanized steel sheet is cut from galvanized steel coil, the base material is cold rolled steel, it has good processing performance. The galvanized sheet coated with a zinc layer,features a smooth, flat,uniform thickness, strong adhesion, no peeling during processing, good corrosion resistance,and excellent adhesion to paint film. It can withstand high temperatures up to 315 ℃ and has excellent surface conductivity. The surface is smooth and clean, the size is accurate, the board surface is straight, the spangles are even and beautiful.

GI Coil Surface Structure

Galvanized Steel Features

Galvanized steel coils have high adhesion,corrosion resistance, and precisely controlled coating thickness. In addition,Galvanized steel is easy to process and weld, and also has a long service life when exposed to the atmosphere.

• Excellent anti-corrosion:

Galvanised Steel has excellent corrosion resistance,the zinc coating layer has better electrochemical protection on steel than painting and plastic coating.It can last for decades of years without any problem of peeling off,and also higher collosion and scratch resistance.

• Strong durability: ​

Not only will the zinc coating play the role of a physical barrier but also protects the steel underneath through electrochemical reactions (sacrificial anode action) when the coating is scratched or damaged.

• Good workability:

Hot-dip galvanized steel coils maintain the processability of steel, and the zinc layer is thin and uniform, which does not affect the performance of steel during processing and forming.

• Thermal resistance

Galvanized steel has good thermal resistance,can be used for long time without discoloration below 230℃, and it will discolor when it exceeds 250℃.

GI Sheet Processing Service

We offer value-added services including polishing, annealing, heat treatment, and welding for GI steel.
Process Service:Bending,Welding,Decoiling,Punching,Cutting,Moulding,or as requirement

GI Coil Packing

Galvanized Coil Material Testing

• Mechanical Testing Such as Tensile of Area
• Hardness Test
• Chemical Analysis – Spectro Analysis
• Positive Material Identification – PMI Testing
• Hardness Test
• Micro and MacroTest
• Pitting Resistance Test
• Flaring Test
• Intergranular Corrosion (IGC) Test

FAQ

Q: Do you provide samples ? is it free or extra ?
A: The sample could provide for customer free,but the freight will be covered by customer account.

Q: Do you accept the third-party inspection?
A: Yes,absolutely we accept.

Q: How could you guarantee your products?
A: Each piece of products is manufactured by certified workshops, inspected by HNJBL piece by piece according to national QA/QC standard. We also could issue the warranty to customer to guarantee the quality.

Q: How can I get your quotation as soon as possible?
A: The email will be checked within 6 hours,and the Wechat and WhatsApp will be online 24 hours.Please send us your requirement and order information,specification(Steel grade,size,quantity,destination port),we will work out the best price soon.