Steel coil classification
Release time :
2024-11-08
Hot rolled coils are manufactured in hot-rolling mills. Hot-rolling is the metal-treatment process that takes place at high temperatures approximately more than 2000 degrees Fahrenheit above the recrystallisation temperature of most steel types.
Hot rolled steel coils
Hot rolled coils are manufactured in hot-rolling mills. Hot-rolling is the metal-treatment process that takes place at high temperatures approximately more than 2000 degrees Fahrenheit above the recrystallisation temperature of most steel types. Hot rolling begins when a large, long steel called billet is heated and sent to a large roll to be flattened into sheets. It is then passed through a series of rolls maintaining its high temperature until they reach the desired dimensions. These steel sheets are then spun and left to cool.
Since hot rolled steel is cooled after processing, it shrinks leading to less control over its final shape. This makes it less suitable for precision applications. Railway tracks and construction projects often use hot rolled steel.
Hot rolled steel is usually identified using the following characteristics:
- A scaled surface which is an after-effect of cooling from extreme temperatures.
- Slightly rounded edges and corners for bar and plate products due to shrinkage and lack of precision finishing.
Cold rolled steel coils
Cold rolled steel coil is an output of hot rolled steel. Hot rolled steel that is cooled completely is re-rolled at room temperature to produce cold rolled steel coil. This steel coil processing method helps achieve exact dimensions and better surface qualities.
Cold rolled steel coils undergo the rolling process which are metal sheets put between two rollers. There are other cold finishing processes including turning, grinding, and polishing. These processes are used to modify the hot rolled steel into more refined products.
Cold rolled steel is usually identified using the following characteristics:
- Smooth finished surfaces
- Well-defined edges and corners
- Better uniformity
There are also other kinds of steel coils including galvanised steel coil, carbon steel coil and stainless-steel coil. All these types of coils have varying mechanical and physical properties.
Steel coil specifications depend on the type of steel coil in question. For example, while the thickness range of commercial quality galvanised steel coil is 0.14-0.80 mm the thickness range of carbon coil steel is from 0.0508 – 0.889 mm. Steel coil sizes also vary according to the supplier.
Before choosing the steel coils for your business, learning how steel coils are categorised and the applications of different steel coils can help you pick the perfect steel coil product for your manufacturing processes.
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