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Coated & Value-Added Steel

Galvanized Coils
Galvanized Coils

Galvanized Coils

Galvanized coils are a cornerstone of the steel industry, known for their durability, corrosion resistance, and versatility. They are used in various applications across multiple industries, including construction, automotive, and manufacturing. The zinc coating on these coils acts as a protective barrier, preventing rust and corrosion, which significantly extends their lifespan. The manufacturing process involves submerging steel coils in molten zinc, creating a robust and uniform coating that enhances structural strength. Galvanized coils are also known for their high tensile strength, good corrosion resistance, and high ductility, making them suitable for demanding environments.

galvanized-steel-coil
Galvanized Coils

Production Process

A. Hot-Dip Galvanizing (HDG):

Surface Preparation:
Degreasing: Removes oils and dirt using alkaline solutions.
Pickling: Immerses steel in hydrochloric acid to eliminate rust and mill scale.
Fluxing: Applies zinc ammonium chloride to prevent oxidation.

Galvanizing:
Steel is dipped into molten zinc at 450°C (842°F), forming a metallurgical bond.
Zinc reacts with iron to create zinc-iron alloy layers (gamma, delta, zeta) topped with pure zinc.


Cooling and Finishing:
Air or water quenching solidifies the coating.
Coating thickness ranges from 50–150 microns (µm).

Applications: Structural beams, roofing sheets, highway guardrails.

B. Electro galvanizing (EG)

Surface Cleaning:
Alkaline solutions remove contaminants; acid activation prepares the surface.

Electroplating:
Steel is immersed in a zinc sulphate solution.
An electric current deposits zinc ions onto the steel, creating a thin, uniform coating (5–30 µm).

Post-Treatment:
Chromate or phosphate passivation enhances corrosion resistance.

Applications: Automotive body panels, appliances, electronics.

Corrosion Resistance

Sacrificial Protection: Zinc corrodes preferentially, protecting the steel substrate.
Salt Spray Performance: HDG coils withstand 1,000+ hours (ASTM B117) in coastal environments.

Durability

Lifespan: HDG lasts 50–100 years in moderate climates; EG lasts 10–25 years.
Low Maintenance: No repainting required, reducing lifecycle costs by 30–40%.

Formability

HDG coils can be shaped into corrugated roofing or structural beams without cracking.
EG’s smooth surface allows precision stamping for automotive parts

Cost Efficiency

Initial Cost: HDG costs 1,200–1,200–1,800/ton; EG costs 1,000–1,000–1,500/ton.
Lifecycle Savings: Eliminates rust repairs and replacements.

bare galvanized
Bare Galvalume (BGL)

Bare Galvanized Coils

Bare Galvalume (BGL) is a type of steel sheet coated with a mixture of aluminium and zinc, known for its excellent corrosion resistance and thermal reflectivity

Overall, BGL sheets are a preferred material in the steel industry for their performance and reliability in various applications

galvanized-steel-coil
Galvanized Coils

Corrosion Resistance

BGL sheets are designed to withstand harsh environmental conditions, making them ideal for industrial applications where rust and corrosion are common

Thermal Reflectivity:

They reflect up to 75-80% of solar radiation, helping to keep interiors cooler and improving energy efficiency.

Applications:

BGL sheets are commonly used in roofing, cladding, and pre-engineered buildings (PEB) due to their durability and cost-effectiveness

Cost-Effectiveness:

BGL sheets require less maintenance and have a longer lifespan compared to other roofing materials, making them a sustainable choice for industrial projects.

Colour Coated Coils
Colour Coated Coils

Colour Coated Coils

Colour coated coils are a versatile and aesthetically pleasing solution for various applications in the steel industry. They offer enhanced durability, corrosion resistance, and aesthetic appeal, making them suitable for a wide range of uses. Here are some key points about Colour Coated Coils in the steel industry:

These coils are widely used in construction, automotive manufacturing, home appliances, solar energy devices, and furniture. They are also used in buildings, automobiles, home appliances, solar energy devices, furniture, and more

Colour Coated Coils
Colour Coated Coils1
Colour Coated Coils

Corrosion Resistance

Colour coated steel coils are designed to resist corrosion, ensuring longevity in diverse environmental conditions. The protective coating acts as a barrier against moisture, preventing the formation of rust and corrosion on the underlying steel.

Aesthetic Appeal:

The wide range of available colours and finishes allows architects and manufacturers to achieve desired visual effects, making these coils ideal for applications where appearance matters.

Durability

The additional coating not only enhances the steel’s corrosion resistance but also contributes to its overall durability, making them suitable for use in challenging environments

Weather Resistance

Colour coated steel coils are engineered to withstand the impact of various weather conditions, whether it’s intense sunlight, heavy rainfall, or snow.

AluSil Coils

Aluminium silicon coils are a crucial component in the steel industry, offering a range of benefits that enhance the performance and durability of various steel products. Here are some key points about aluminium silicon coils in the steel industry

Corrosion Resistance

The aluminium-silicon alloy coating provides excellent protection against oxidation and rust, making the steel resistant to moisture, chemicals, and atmospheric elements.

Thermal Reflectivity

The surface of aluminium silicon coils has high reflectivity, which helps retain and reflect radiant heat, making them efficient in applications that require thermal management

Aesthetic Appeal

The smooth, bright, and silvery appearance of aluminium silicon coils enhances product aesthetics, making them suitable for applications where appearance and corrosion resistance are important

Heat Resistance:

These coils can withstand temperatures up to 900°F (482°C) without losing structural integrity or suffering from scaling, making them suitable for high-temperature environments like ovens and furnaces

Formability and Weldability

Aluminised steel is relatively easy to form, bend, and stamp, making it versatile for various manufacturing processes. It is also weldable using appropriate techniques, although care must be taken to avoid damaging the coating

Alusil Coil1
Alusil Coil

These properties make aluminium silicon coils a preferred choice for various applications in the steel industry, including automotive, construction, and manufacturing sectors. They are also used in the new energy vehicle industry due to their lightweight properties and high-temperature resistance

Zinc magnasium
Zinc Magnesium (ZM) Coils

Zinc Magnesium (ZM) Coils

Zinc Magnesium (ZM) Coils in the steel industry are known for their exceptional corrosion resistance and durability. They are a modern alternative to traditional galvanized and galvalume steel, offering superior protection in harsh environments. The ZM coating is a combination of zinc, aluminium, and magnesium, which forms a protective layer that can heal small scratches or damages, extending the lifespan of the steel. These coils are lightweight, formable, and paintable, making them suitable for a wide range of applications, including roofing, siding, and automotive components. The ZM coating is environmentally friendly and fully recyclable, contributing to sustainability and environmentally friendly practices.

Zinc Magnasium Coils2
Zinc Magnasium Coils1
Zinc magnasium

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Vision

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