Hot rolled steel sheet is uncoated and is formed at
a temperature of 860 degrees celcius at the mill and is reduced by
maintaining the strip temperature. The product thus derived is termed as
"mill finish" referring to the surface condition. The surface
has a dull grey color
with
heat markings on the surface. There is a difference between the cold
rolling and the hot rolling process. The hot rolling process is not as
refined as the cold rolling process. The product produced from the hot
rolling process lacks lusture and good surface finish as is the case
with the cold rolled steel sheet. Hot rolled sheets are either used "as
is" or are further modified in the cold reduction process for
future use.
Hot rolled products are categorized under five heads, likewise:
- Structural
- Carbon
- Formable
- Extra Formable
- Hardness
Manufacturing Process:
Advanced thickness control technology is used to manufacture Hot rolled
steel sheet in order to maintain it's thickness. The procedure is that
cast slabs are continuously rolled for the required thickness. Due to
hot rolling procedure the steel tend to carry oxide known as scale. Acid
pickling is the process by which the surface oxide is removed if
specified by the customer. The other customized features that are
available in the hot rolled sheets are -
- Slitting
- Tempering
- Blanking
- Cut to length
Applications:
Hot rolled steel sheet has a wide application. Some usages are typical
of hot rolled steel sheet like- The Automotive parts as in-
- Wheels
- Body structural components
- Brakes
- Bumpers
- Suspension components
- Interior components
- Drive train
- Hydro formed tubes
The Hot rolled sheets are also used in manufacturing tubular
products like:
- LPG cylinders
- Pipes
- Shuttering plates (For construction work) too
- Pre-engineered buildings
- Sheet piling
Types of Hot rolled steel sheet:
The Hot rolled steel sheets are available in varied versions, each
having specific qualities for some particular end usage. The Hot rolled
steel sheet are of the following types-
