Galvenized Coil And Plain Sheet
Galvanized Coils and Plain Sheets Manufacturer in India
Gadhpat Technofab Private Limited is a reliable galvanized coils and plain sheets manufacturer in India, supplying premium-quality steel coils and flat sheets for roofing, fabrication, and industrial applications. Manufactured using high-grade steel and advanced galvanization processes, our products deliver superior corrosion resistance, strength, and long-term durability.
As a trusted supplier of industrial steel materials and roofing raw materials, we support manufacturers, fabricators, and construction companies with consistent quality and dependable supply.
High-Quality Galvanized Coils & Plain Sheets for Industrial Use
Our galvanized coils and plain sheets are produced with uniform zinc coating and strict quality control to ensure excellent performance in demanding environments. These materials are ideal for further processing into roofing sheets, wall cladding panels, purlins, decking sheets, and fabricated components.
Key advantages include:
- Uniform zinc coating for corrosion protection
- High tensile strength and formability
- Smooth surface finish for fabrication
- Long service life with low maintenance
- Consistent thickness and dimensional accuracy
Steel Coils, Plain Sheets & Roofing Raw Material Solutions
As part of our steel coils, flat sheets, and roofing raw material category, our galvanized coils and plain sheets integrate seamlessly into downstream manufacturing processes. They are widely used by roll-forming units, PEB manufacturers, and fabrication workshops across India.
Process Of Galvanizing
The process of galvanizing steel sheet was developed simultaneously in France and England in 1837. Both of these methods employed a ‘hot dipping’ process to coat steel sheet with zinc.
Galvanizing is carried out on cold rolled sheets/cold rolled strips. Galvanizing process is broadly divided into hot dipping and electro- galvanizing. The hot dip process is more suitable for heavy coating weights, and electro-galvanizing for lighter coatings. For reasons of efficiency, galvanizing of cold rolled strip is more common than galvanizing of cold rolled sheets.
- Hot dip galvanizing – The principle of the process consists of the immersion of steel strips in molten zinc. The zinc used for galvanizing is high grade with a zinc content of minimum of 99.95 %. After passing through the pretreatment tanks for degreasing, pickling, and cleansing, the strip passes through the annealing furnace and a pot containing molten zinc. The annealing furnace is used to apply the heat cycle needed to obtain the required mechanical properties and activate the surface with a reducing gas, which makes it easy to coat zinc on the strip surface. The coating weight is controlled by a purge gas jet blown on both surfaces of the strip from a nozzle above the pot, to remove excessive molten zinc. This process gives a relatively thick coating of zinc that freezes into a crystalline surface pattern known as spangles. During the process, a multiple layered structure of iron-zinc alloys is formed between the inner surface of the zinc coating and the steel strip.
- Electro-galvanizing – The principle of the process consists of immersion of steel sheet in an electrolyte, a solution of zinc sulfate or cyanide. Electrolytic action deposits a coating of pure zinc on the surface of the iron or steel. The advantages of this process is that the thickness of the coating can be accurately controlled while the limitation of this process is that the thick coatings provided by the hot dip galvanizing process are not usually possible with this method.
A part of the GI steel production is corrugated to produce corrugated sheets (GC). Today the corrugation process is carried out using the process of roll forming. This modern process is highly automated to achieve high productivity and low labour costs. In the corrugation process sheets are pulled off huge rolls and through rolling dies that form the corrugation. After the sheets pass through the rollers it is automatically sheared off at a desired length. The standard shape of corrugated material is the round wavy style, but can be easily modified to a variety of shapes and sizes by simply changing the dies.
The cross section of a galvanized strip is composed of the steel substrate, iron-zinc alloy layers, and a zinc layer. Because the paint adhesion and weld ability of the surface of this zinc layer are not necessarily good, galvannealing has been developed to improve these properties. In the basic process for galvannealed strip, the zinc-coated strip emerges from the pot and is heated in a galvannealing furnace, forming an iron-zinc alloy layer by the inter-diffusion of iron and zinc coating layer, so that the surface of the zinc layer also contains some amount of iron. The galvannealing line is usually equipped with a skin pass mill, a tension leveler, and chemical treatment equipment for chromating, following the galvannealing furnace. GI sheets are produced both in annealed and full hard conditions.
GI Sheet Specification
| THICKNESS : | 0.45 MM TO 3 MM |
| WIDTH : | 100 MM TO 1520 MM |
| LENGTH : | FULL SLIT /SLIT COIL/CUT TO LEN (CTL)/BLANKS |
| GRADE : | CQ,DQ,DDQ,EDD,IF,HIGH STRENGTH |
| COATING MASS : | 60 -550 GSM |
Applications of GI Sheet
- Construction – Roofing, side walls, partitions, panels, valley gutters, louvers, false ceilings, partition walls and ducks, rolling shutters, highway bumpers, slotted angles and paint coated products
- Automobile sector – Car, bus and truck bodies, undercarriage work, air and oil filters, fuel and oil tanks, exhaust pipes
- Other general uses – Ducting, drums/barrels, containers, thermal cladding, railway coaches, sign boards, hoardings and road signs
Advantages With Use Of GI Sheets
- Low cost – Galvanizing is lower in first cost than many other commonly specified protective coatings for
- Less maintenance cost – GI sheets are virtually maintenance free and last
- Long life -The life expectancy of GI sheets is quite high in rural, urban and coastal
- Galvanizing is usually carried out as per standards and minimum coating thicknesses are applied. Coating life and performance are reliable and predictable.
- Complete protection – Every part of a galvanized iron sheet is protected.
