Flat strip rolling process:
The flat strip rolling is only for rectangular cross sectional part produced. This process reduction of ingots in staring, 1.5 m long 300 to 500 mm square in cross section. The ingots is a product of continuous casting and heated in soaking pit furnaces.
The cast ingot preheated (1200⁰c) and rolled into one of the three intermediate shapes is called blooms, billets or slabs.
- Bloom having square cross sectional area of 150×150 mm or more.
- Slab having (40×250 mm) is rolled from ingot or bloom.
- Billet having (40×40 mm) cross section area rolled from a bloom.
The starting and ending of material have rectangular cross sectional area in rolling process of flat rolling. For normally, the slab is flat rolling. The metal is fed in between two rollers it is called working rolls or roughing rolls, which roller is rotated in opposite direction.
The starting material thickness is having more than the gap between the two rollers, so the metal is deformed together and then the thickness of material is decreased and elongated. Interface between the materials and roller the friction is provided for this causes the material to be pushed through for a single pass deform of metal is limited by friction. If the thickness changed too great, when the roller just slip over the material and do not draw it.
Finally the product is smaller thickness such as sheet metal or plate. In the flat strip rolling can be machined in 6 mm thickness and below. The end of the product are flat thin sheets and weld tubes.
Sometime the flat strip process to allow sufficient amount of heat in work-ability of metal. Lubrication is often allowed to keep work piece from sticking to the roll. The speed of rolling and temperature can be adjusted during the process.