Review of Different Types of GI Sheets
Contents |
[edit] Introduction
Galvanized iron sheet is one of the most commonly used steel materials in the world for homes, businesses, buildings, industries, automobiles, and so on. It is steel that has been coated with zinc to prevent corrosion and prolong service life.
[edit] Manufacturing method
[edit] Hot dipped galvanized sheet (HDG sheet)
HDG steel sheet is mainly produced by the continuous hot-dip galvanizing process. That is, the steel will be put into the molten zinc bath at temperatures of 500 degrees to form a close alloy film. This process provides a thicker zinc coating, about 30-275 g/m2, and can freeze into crystallized zinc spangles. They are mainly used in outdoor and harsh environments, including construction, machinery, infrastructure, mining, etc.
[edit] Electro galvanized sheet (EG sheet)
EG sheet is also called cold galvanized steel sheet, in which a layer of zinc is bonded to steel in order to protect against corrosion. The zinc coating will be applied by electro-deposition during the continuous electrolytic coating process at room temperature. It offers a thin but uniform zinc coating, about 10-50 g/m2. Its corrosion resistance is not as good as that of hot-dip galvanized steel sheet. Electro galvanized sheet is commonly applied in indoor places and environments that require less corrosion resistance but better aesthetics. Industries include automobiles, furniture, home appliances, vessels, electronic equipment, commerce, etc.
[edit] Corrugated galvanized sheet (CGI sheet)
This takes GI sheets as material and then profiles them into corrugated patterns with a roller mill, which will increase the bending and malleability strength of steel. They come in different forms such as trapezoidal, wavy, ribbed, and tile designs. Sometimes, it is also in the form of a flat sheet.
[edit] Plain GI sheet
Plain galvanized steel sheet is a metal sheet coated with protected metallic and organic zinc coatings, with no extra deformed design. Extensively used in the automobile, transportation, construction, home appliances, and civil engineering industries. It can work as the trunk, back panel or boards. It can be further processed for other uses, such as PPGI sheet/coil, corrugated GI sheet, fencing, steel piping, etc.
[edit] Related articles on Designing Buildings Wiki
Featured articles and news
We're expanding our collaborative mission by launching DB Intelligence, an exclusive market research advisory panel. Built environment professionals can now get paid to share their expertise on industry trends, products and services.
Panel members receive direct financial incentives for participating in research projects like short surveys, 1-2-1 interviews and focus groups. Register today to shape the future of the construction sector.
Planning condition discharge in England and Wales
A brief exoplanation from a building compliance expert, with further links.
Overheating guidance and tools for building designers
Guidance for dealing with element of building fabric control that have increasing importance.
Shading for housing, a design guide
From the Good Homes Alliance and British Blind and Shutter Association.
UK Standard Skills Classification (SSC)
A shared framework for describing skills needs.
Social media ban consultation comes to close
CIOB urges UK Government to consider social media’s role in careers guidance in ban debate.
The latest of eight Skills England apprenticeship units
The addition of battery manufacturing welcomed by ECA with a warning about the risks of fast-tracked apprenticeship units.
Building Control Independent Panel final report
A precis of a key report led by Dame Hackitt with full recommendations and link to the government response.
Building Safety recap April, 2026
A short and longer run-through of the month, with links to further information and sources.
CIAT May 2026 briefing.
From medieval scribes to modern word art.
ECA welcomes crackdown on late payment and push for clean energy, whilst CIOB seek fixed cladding removal timeframes.
Cyber Security in the Built Environment
Protecting projects, data, and digital assets: A CIOB Academy TIS.
Managing competence in the built environment
ITFG publishes new industry guide on how to meet the ICC principles.
The UK's campaign to reduce noise pollution: Mythbusting, articles and topic guides.