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Galvanizing Process Cycle & Details

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Q. I want to know about Galvanizing Process Including Process cycle & Working temp. How much will be the cost to set up full fledged plant including Pollution ETP setup Size app 500 mm X 1000 mm height.

Thirugnana Sambandam
- Chennai, Tamil Nadu, India
2003

SUGGESTED GALVANIZING BOOKS
for Engineers, Shops, Specifiers

"Hot Dip Galvanizing of Steel Structures" by Kuklik & Kudlacek (2016)
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"Handbook of Hot Dip Galvanization" by Maass & Peissker (2011)
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"Galvanized Steel Reinforcement in Concrete" by Stephen Yeomans (2004)
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"Hot Dip Galvanizing -- A Guide to Process Selection & Galvanizing Practice" by M. J. Hornsby (1995)
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"Faults in Hot-Dip Galvanizing" by Dietrich Horstmann (in English, French & German)
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"User's Guide to Hot Dip Galvanizing for Corrosion Protection in Atmospheric Service" by NACE (1997 only rarely avail.)
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A. Hi,

Galvanizing in India - sounds interesting. Have you done a market research yet? If not, I'll tell you to do that as the first thing.

The hot dip galvanizing process cycles as:

1. Surface preparation
2. Caustic cleaning
3. Rinsing
4. Pickling (acid solution)
5. Rinsing
6. Fluxing
7. Drying
8. Hot dip galvanizing (bath operating temperature is kept between 450-460 °C).
9. Inspection and finishing

This is the standard way to do hot dip galvanizing. Some companies around the world do some extras. Some paint the galvanized surfaces (Duplex).

The kettle length is often between 3-15 m. A few companies do have longer kettles - up to 25 m. When using smaller kettles, you will have to "double-dip" long constructions.

How much a complete galvanizing facility costs is a country individual question. How much gear can you buy in India ? How much gear will you have to import (transport and taxing costs). You will need a complete list to predict the exact costs.

Poul Søndergaard
- Denmark

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