About Hot rolled

About Hot rolled

Hot rolling is relative to cold rolling, cold rolling is rolling below the crystallization temperature, and hot rolling is rolling above the crystallization temperature.

Also known as, hot plate, hot rolled plate. Hot-rolled slabs use continuous casting slabs or blooming slabs as raw materials, heated by a walking heating furnace, high-pressure water descaling, and then enter the rough rolling mill. The rough rolling materials are cut head, tail, and then enter the finishing rolling mill for computer control. Rolling, after the final rolling, it undergoes laminar cooling (computer controlled cooling rate and coiling by the coiler to become a straight hair coil.
Advantage

□ Advantage
(1) Hot rolling can significantly reduce energy consumption and reduce costs. During hot rolling, the metal has high plasticity and low deformation resistance, which greatly reduces the energy consumption of metal deformation.

(2) Hot rolling can improve the processing performance of metals and alloys, that is, the coarse grains in the as-cast state are broken, the cracks are healed significantly, the casting defects are reduced or eliminated, the as-cast structure is transformed into the deformed structure, and the processing performance of the alloy is improved.

(3) Hot rolling usually uses large ingots and large reduction rolling, which not only improves the production efficiency, but also creates conditions for increasing the rolling speed and realizing the continuity and automation of the rolling process.

□ Classification
Hot rolled steel plates are divided into structural steel, low carbon steel and welded bottle steel. The hot-rolled steel sheet has low hardness, easy processing and good ductility. The strength of hot-rolled steel plate is relatively low, and the surface quality is poor (oxidation\low finish), but it has good plasticity. Generally, it is medium and thick plate, cold-rolled plate, high strength, high hardness, high surface finish, and generally thin plate, which can be used as stamping Use the board.

Size Specification

The size of the steel plate should meet the requirements of the table “Dimensions and Specifications of Hot Rolled Steel Plates (Excerpted from GB/T709-2006)”.
The width of the steel plate can also be any size of 50mm or a multiple of 10mm, and the length of the steel plate is any size of 100mm or a multiple of 50mm, but the minimum length of a steel plate of thickness less than or equal to 4mm shall not be less than 1.2m, and the minimum length of a steel plate of thickness greater than 4mm shall not be less than 2m. According to the requirements, the thickness of the steel plate is less than 30mm, the thickness interval can be 0.5mm. According to the needs, after negotiation between the supplier and the buyer, steel plates and strips of other sizes can be supplied.