Four Ways Of Cold Rolling Metal Tubes

Published: 28th April 2010
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Cold rolling is a metal working process and it differs from hot rolling or induction bending by the amount of heat that is applied to the metal. In cold rolling the metal is typically at room temperature, while hot rolling the metal is heated to a much higher degree. Cold rolling is used to reduce the size and thickness of a metal and this process will also increase the strength and hardness of the metal.

Cold rolling is completed at room temperature and the metal sheet is passed through two or more rollers that are set at a controlled weight. The rollers will decrease the thickness of the metal sheet while increasing its strength and hardness. There are four main types of cold rolling processes and they are as follows:

#1 Full Hard - Finished metal that has been through the Full Hard cold rolling process will only be able to be bent to a 45-degree angle and will be used for very specific industry applications.

#2 Half Hard - Metal cold rolled with the Half Hard process will typically be rolled into pipes that can be bent to a maximum of 90 degrees. These metal pipes will be used in multiple industries, from the automotive to construction industry.

#3 Quarter Hard - With the Quarter Hard cold rolling process finished metal can be bent or rolled without causing any fractures or cracks.

#4 Skin-rolling - This cold rolling metal process is used to reduce the thickness of a metal by 0.5 to 1 percent. This process will result in a smooth metal sheet that is more ductile than the other processes.

There are many applications for metal that has been finished with the cold rolling process however most finished metal is typically made into the following three products:

#1 Plate metal - Once cold rolled, metal plates are over 6mm in thickness and can be used in a wide variety of functions, from the construction industry in things such as building components for high-rise buildings and bridges to transportation applications like plate metal for automobiles and airplanes. Cold rolled plate metal is even used in military applications such as armour for vehicles such as tanks.

#2 Sheet metal - Sheet metal ranges from 0.2mm to 6mm in thickness and is used in a wide variety of industries including construction, where it is used in aluminum siding, roofing and duct work and in the automotive sector where it is used for making automobile body panels.

#3 Foil metal - Metal foil is typically less than 0.2mm in thickness and is used mainly in packaging industry, think the aluminum foil you may use to wrap up your leftovers. Foil metal can also be used in the construction industry as building insulation, in the electrical industry, and in the printing industry.

In short you can find examples cold rolling metal products in almost all aspects of our modern day life. Without the four processes, full hard, half hard, quarter hard and skin-rolling many of the consumer products, shelter and infrastructure we take for granted could not be possible.

Corey Rozon is a freelance writer from Ottawa, Canada.
This article about the four different types of steel cold rolling processes was written for Paramount Roll, a company who specializes in square tube bending.

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