Through the process of steel extrusion the profiles having fixed cross-sectional area are produced that are then used in number of applications. When any metallic profile is exposed to the steel extrusion process the resultant is steel extruded profile. The steel extrusion made are then used in automotive, rail and rail track, heavy machinery, and construction industry.
Process of Steel Extrusion
The process consists of four methods of productions, that are:
- Hot Rolling
- Hot Extruding
- Cold Drawing
- Laser Welding
In Hot Rolling method billet or slab of length up to 70 m are made by two cylindrical rolls that rotate in opposite directions. The extruded profiles created by this method are used in number of applications like rail tracks, automotive etc. With this process more focused and selective strength is given to the specific part of the steel profile.
During hot extrusion process, pre heating of round steel billet is done. Then product is then pushed through a forming die with the extrusion force of 2200 t. Complex profile shapes are made through the process of hot extruding process. Single profile with varied thickness can be produced by the hot extrusion method. The steel extruded profiles made through hot extruding process are used in very sensitive areas and the area that needs great hygienic environment.
Complex profile cross sections are made through the technology of cold drawing. The profile bars made are pre heated and then de-scaled. After de-scaling it is drawn through a forming die. This process is repeated 3-4 times. It helps in the improvement in surface quality as well as dimensional accuracy. These profiles also have sharp edges and uninterrupted grain orientation.
In the process of laser welding, both- standard geometries as well as extruded or hot rolled pre-shapes are used. The steel extruded profiles with this process get the clean welding seams and because of this reason these are used in building industry to make fine architectures. These profiles have precision fit and produced in free form shapes.