What is SECC EG electro-galvanised steel sheet? Applications in Mechanical Engineering, Electrical Cabinets, Cable Trays and Ladders

What is EG steel sheet? In-depth concept of SECC electro-galvanised steel

EG steel sheet, also known as EG electro-galvanised steel sheet or SECC electro-galvanised steel, is a type of cold-rolled steel coated with a zinc layer by electro-galvanising (Electro Galvanizing). The material surface has a characteristic metallic blue color due to the very thin and uniform galvanised layer, creating the EG effect which is often called EG steel sheet in the mechanical industry.

Unlike hot-dip galvanised steel sheet (GI – Galvanized Iron), electro-galvanised steel sheet is not zinc-coated by dipping into a molten zinc bath, but uses electric current to deposit zinc ions onto the cold-rolled steel surface. This method allows very precise control of the coating layer thickness, creating a smooth, flat surface with high aesthetic appeal.

In international standards, EG electro-galvanised steel sheet is often designated as SECC (Steel Electrolytic Chromated Coil) or EG steel (Electro Galvanized Steel). This material is widely used in precision mechanics, manufacturing of electrical cabinets, cable trays, industrial equipment, and products requiring high precision.

Structure of EG electro-galvanised steel sheet material

EG steel sheet is produced through several consecutive stages, including:

• Base steel: cold-rolled steel (Cold Rolled Steel – CR) with high precision
• Coating layer: electro-galvanised zinc by electrolysis
• Surface treatment layer: anti-corrosion chromate layer creating EG color

Thanks to the thin but very uniform electro-galvanised coating, the material has good oxidation resistance in indoor environments, while maintaining higher flatness and precision compared to hot-dip galvanised steel sheet.

Why does electro-galvanised steel sheet have an EG color?

The characteristic blue color of EG steel sheet is not paint, but the result of the chromate coating surface treatment after electro-galvanising. This chromate layer helps increase anti-corrosion and oxidation resistance, and creates a light metallic blue color on the metal surface.

This chromate layer makes electro-galvanised steel sheet have a bright, smooth surface with high aesthetic appeal, very suitable for products requiring mechanical fabrication or a beautiful surface.

Distinguishing EG steel sheet from hot-dip galvanised steel sheet

• EG steel sheet: electro-galvanised, thin coating layer, beautiful surface, used in mechanics
• Galvanised steel sheet: hot-dip, thick coating layer, good outdoor anti-corrosion
• EG steel sheet: high precision, easy to bend and stamp
• Galvanised steel sheet: better weather resistance

Therefore, in the mechanical industry, EG steel sheet is used more than galvanised steel sheet when precision and aesthetics are required.

Structure of EG electro-galvanised steel sheet

EG electro-galvanised steel sheet is produced from cold-rolled steel (CR) then fed into an electro-galvanising line to coat a thin zinc layer onto the surface.

• Base layer: cold-rolled steel with high precision
• Coating layer: electro-galvanised zinc
• Surface layer: characteristic EG color

Thanks to the thin and uniform electro-galvanised coating, SECC steel sheet has a very beautiful surface, is easy to paint, easy to fabricate, and has minimal peeling.

Technical advantages of EG steel sheet (SECC) in mechanical fabrication and industrial equipment

EG steel sheet (SECC electro-galvanised steel) is widely used in precision mechanics, electrical cabinets, cable trays, and industrial equipment due to advantages that hot-dip galvanised steel sheet or ordinary cold-rolled steel cannot easily meet. These advantages come not only from the galvanised coating, but also from the nature of the cold-rolled steel base material and the high-precision electro-galvanising method.

1. High precision due to using cold-rolled steel as base

Electro-galvanised steel sheet is produced from cold-rolled steel (CR), which is a type of steel with very small dimensional tolerances, a flat and uniform surface. This gives EG steel sheet high stability in terms of thickness, flatness, and hardness, suitable for parts requiring precision fabrication.

In applications such as electrical cabinets, cable trays, machine casings, or bent and stamped parts, the precision of the base material directly determines the quality of the product after fabrication.

2. Thin but very uniform electro-galvanised coating

Unlike hot-dip galvanised steel sheet, the coating layer of EG steel sheet is created by electrolysis, allowing control of the zinc layer thickness to be very small but extremely uniformly distributed over the entire surface.

Thanks to the uniform coating layer, the material has the following advantages:

• Smooth surface, no roughness
• Easy to paint, easy to re-coat
• No coating peeling during bending and stamping
• Fewer errors during fabrication

This is why electro-galvanised steel sheet is used more in precision mechanics than hot-dip galvanised steel sheet.

3. Excellent bending, stamping, cutting, and forming capabilities

Due to the thin coating layer firmly adhering to the base steel, EG steel sheet can withstand cold fabrication processes such as bending, stamping, forming, cutting, and rolling without the coating layer peeling.

In the production of cable trays, electrical cabinets, or mechanical parts, the material often undergoes many forming stages. If the coating layer is too thick or uneven, the surface will easily crack or peel, reducing anti-corrosion capability.

Electro-galvanised steel sheet effectively solves this problem thanks to its thin but firmly adhering coating layer.

4. Beautiful surface, high aesthetic appeal, suitable for finished products

The surface of EG steel sheet has a slight sheen, a characteristic metallic blue color due to the anti-corrosion chromate layer. This treatment layer helps the material resist oxidation while maintaining a clean and uniform surface.

As a result, electro-galvanised steel sheet is often used for:

• Electrical cabinet casings
• Industrial electrical equipment
• Household appliances
• Machine casings
• Products requiring powder coating

Compared to hot-dip galvanised steel sheet, the surface of EG steel sheet is smoother and easier to achieve higher paint quality.

5. Good anti-corrosion in indoor environments

The galvanised coating combined with the chromate layer helps electro-galvanised steel sheet have good oxidation resistance in dry or indoor environments. Although its corrosion resistance is not as high as hot-dip galvanised steel sheet, it is sufficient for most mechanical and equipment applications.

In practice, most electrical cabinets, cable trays, and machine casings are used indoors or in controlled environments, so EG steel sheet is the optimal choice between durability and precision.

6. Suitable for mass production and industrial fabrication

Due to its high precision, beautiful surface, and good fabrication capability, EG steel sheet is very suitable for large-volume industrial production, where stable material, fewer errors, and easy quality control are required.

This is why the mechanics, industrial electricity, cable tray, equipment manufacturing, and machine manufacturing industries often use electro-galvanised steel sheet instead of ordinary galvanised steel sheet.

Applications of EG electro-galvanised steel sheet in practice

EG electro-galvanised steel sheet is widely used in various industries:

• Electrical cabinet fabrication
• Cable tray manufacturing
• Machine casing fabrication
• Precision mechanics
• Industrial equipment manufacturing
• Bending and stamping fabrication according to drawings

Products requiring high flatness, aesthetic appeal, and precision often use electro-galvanised steel sheet instead of galvanised steel sheet.

Why do many construction projects choose large-width electro-galvanised steel sheet?

Currently, many construction projects require large-width steel sheet to reduce joints, minimize waste, and increase robustness. However, not every supplier has large-width electro-galvanised steel sheet readily available.

Common widths:

• 1000mm
• 1250mm
• 1500mm and above

Large-width steel sheet helps reduce fabrication costs and increases the aesthetic appeal of products.

VIEW PRODUCT DETAILS FOR EG ELECTRO-GALVANISED STEEL SHEET - EG STEEL SHEET NOW: EG ELECTRO-GALVANISED STEEL (EG)

Phu Cuong Steel Sheet & Steel – Leading Reputable Large-Width Steel Sheet Distributor

Phu Cuong Steel Sheet & Steel specializes in supplying EG electro-galvanised steel sheet, EG steel sheet, galvanised steel sheet, and various types of steel plates with different specifications, especially readily available large-width steel sheet in 1000mm, 1250mm, 1500mm, and upon request.

Advantages when purchasing from Phu Cuong:

• Rare large-width products readily available in the market
• Cut to specifications
• Coil slitting – cutting – bending – stamping
• Fast delivery by private truck
• Correct thickness – correct specifications
• Full CO CQ

Address: 2177C – 2177D National Highway 1A, Dong Hung Thuan Ward, District 12

Phone: 0933 919 899

Website: tonthepphucuong.com

See more related articles:

• Steel Sheet and Steel Dealer District 12 – Galvanised Steel Sheet, EG/GA Steel Sheet, Wide Steel Sheet Warehouse in District 12 Ho Chi Minh City
• Distinguish Sumikin, Dong A, Hoa Sen, Nam Kim Galvanised Steel Sheet – Which Type to Choose for Construction Project?
• Steel Sheet and Steel Materials Used in Mechanical Manufacturing Industry – Which Type to Choose for Precision Fabrication
• What Is 1500mm Width Galvanised Steel Sheet? Advantages When Using Wide Steel Sheet 1500 in Fabrication and Construction