WHAT IS GALVANIZING PROCESS IN COLD ROLLED STEEL ?

By | April 15, 2016

Steel sheet products are produced through a number of processes. Hot-rolled steel sheet production process, Hot-dip galvanized steel sheet production process, Cold-rolled steel sheet production process and Tinplate/TFS production process are the most significant examples among these.  Most of these integrated series of processes are used in industrial preparation for making various products like bar, road, sheet, etc in a bulk.Here we will discuss galvanizing process in cold rolled steel.

What is cold rolling?

Cold rolling is a process used in cold reduction mills. In this process, the strip stock or the sheet metal is given between rollers in order to compress and squeeze it. As the consequence of it, the strength increases up to 20%. It also improves the strength and surface finish that hold the product tighter and make it more tolerant. The finished product determines strength and hardness.

As the name suggests, cold-rolling happens at a lower temperature where the steel has already recrystallized.  Sometimes, it may be a bit warmer than room temperature.

The cold rolling is preferred for its surface finish and good dimensional accuracy. Cold rolled steel may include various processes like skin-rolled, half hard, quarter hard, and full hard etc.

Various products like strips, bars, sheets, and rods are produced with the cold rolling process. The cold rolling process cannot decrease the thickness of a workpiece like hot rolling process in a single pass. This process is highly useful for breaking up the spangles in galvanization.

Why cold rolling

It shapes the steel perfectly to make it strength and more suitable for better use.

Galvanizing process in cold rolled steel

This cold-rolled steel is protected many times from corrosion. To do so, the galvanizing process is applied. Zinc is chosen for galvanizing cold rolled steel.

It is very important to note that the chemical composition of it can affect coating characteristics. This is why using zinc in Galvanizing process has become a must for cold rolled steel.

Fabrications with various steel chemistries are always good for forming the galvanized coating. Its iron-zinc intermetallic layers at various levels result in a non-uniform coating appearance. Furthermore, corrosion protection is not affected in anyway by non-uniform appearances.

Variations in color, weight and texture never affect the corrosion protection ensured by the galvanized coating. It is notable that upon normal weathering in the environment, the entire coating and galvanizing process commonly evolves a uniform and unique appearance.

As perfectly cleaned steel needs metallurgical reaction that occurs in the galvanizing kettle. The contaminants required removal mechanically from the surface prior to delivering the fabrication to the galvanizer.

GALVALINZED COIL

                          Fig 1. Galvalinzed Coil

Why Galvanizing cold rolled steel

  • Galvanizing with cold rolled steel with zinc protect it from various weather conditions
  • The steel becomes more long lasting and hard in its various surfaces.
  • Bars, roads, and coils all that are formed in this process become more usable in various weather conditions.

In the present era, galvanizing process in cold rolled steel has become highly popular. It has extensive uses in real estate and construction industry.

 

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