Cold Hot Rolled Steel Metallurgy Machine For Slitting Cutting

Steel Metallurgy Machine Steel Slitting And Cutting Machine

Hot rolling: the material needs to be heated during or before rolling. Generally, it is heated to above the recrystallization temperature before rolling. Features of hot-rolled products: Hot-rolled products have excellent properties such as high strength, good toughness, easy processing and forming, and good weldability, so they are widely used in manufacturing industries such as ships, automobiles, bridges, construction, machinery, and pressure vessels.
The rolling process flow of the rolling mill is divided into two steps: hot rolling and cold rolling. The process flow is:
1. Hot rolling process: The billets from the steel mill are only semi-finished products and must be rolled in the steel mill before they can become qualified products.
The continuous casting slab sent from the steelmaking plant first enters the heating furnace, and then passes through the blooming mill repeatedly after rolling, and then enters the finishing rolling mill. Rolled steel belongs to metal pressure processing. Rolled steel plate is like pressed noodles. After multiple squeezing and pushing of a rolling pin, the noodles become thinner and thinner. In the hot rolling production line, the billet is heated to soften, and is sent to the rolling mill by the roller table, and finally rolled to the size required by the user. Steel rolling is a continuous and uninterrupted operation. The steel belt runs fast on the roller table, the equipment is highly automated, and the efficiency is high. Steel ingots from the open hearth can also become steel plates.

After heating and blooming, the billet can be sent to the hot rolling line for rolling. Generally, the thickness of the continuous casting billet is 150～250mm. It consists of a 4-roll mill, with a speed measuring roll and flying shears installed in front of the mill to cut off the head of the plate surface. The hot-rolled products are divided into two types: steel coil and ingot plate. The thickness of the hot-rolled steel rail is generally a few millimeters. If the user requires the steel plate to be thinner, it must be cold-rolled.

Second cold rolling process: Compared with hot rolling, the processing lines of cold rolling plants are more scattered. The cold rolled products mainly include ordinary cold rolled sheets, coated sheets, namely tinned sheets, galvanized sheets and color coated sheets.
The steel coils sent through the hot rolling mill must first undergo three consecutive technical treatments. The oxide film must be removed with hydrochloric acid before being sent to the cold rolling mill. On the cold rolling mill, the decoiler opens the steel coil, and then the steel strip is introduced into the five-stand continuous rolling mill to be rolled into a thin strip. From the five racks, there are also ordinary steel strip coils of different specifications, which are processed according to the various requirements of users, so as to produce a variety of different quality products.