Hot rolling is based on slabs (mainly continuous casting billets), which are heated to form strips by roughing rolling mills and finishing rolling mills. The hot steel strip from the last rolling mill of the finishing mill is cooled to a set temperature by laminar flow, rolled into a steel coil by a coiler, and the cooled steel coil is subjected to different finishing operations according to different needs of users. Lines (flat, straight, cross-cut or slit, inspection, weighing, packaging and marking) are processed into steel, flat and slit steel strips.
Since hot-rolled steel sheet products have high strength, good toughness, easy processing and good weldability, they are widely used in shipbuilding, automobiles, bridges, construction, machinery, pressure vessels and other manufacturing industries.
With the increasing maturity of new technologies such as hot-rolling dimensional accuracy, plate shape and surface quality, and the advent of new products, hot-rolled steel sheets and strip products have become more and more widely used and are becoming more and more competitive in the market. Hot rolling steel products can be divided into ordinary carbon structural steel, low alloy steel, alloy steel according to its material and performance.
According to the use, hot-rolled products can be divided into cold forming steel, structural steel, automobile structural steel, corrosion-resistant structural steel, mechanical structural steel, a welded gas cylinder and pressure vessel steel, and pipeline steel.
The advantage of hot rolling is that it can eliminate certain defects in the cast metal, such as welding the pores, refining coarse grains and changing the distribution of inclusions. The compactness and mechanical properties of the metal are improved. Secondly, the raw material (steel ingot or billet) is increased in thermoplasticity, and the deformation resistance is lowered. Therefore, the amount of deformation can be increased during rolling, which is advantageous for improving productivity. In addition, due to the reduced metal deformation resistance, the requirements for the rolling equipment can be correspondingly lower, so that the cost of the equipment can be reduced and the energy consumption of the motor can be greatly reduced.
The disadvantage of hot rolling is that high-temperature rolling produces iron oxide scale so that the surface of the metal is not smooth and clean; the size of the product is not accurate enough, and the mechanical properties are not as good as cold working.
We can supply high-speed wire rod mill equipment designing, manufacturing, installation, and commission of the equipment with “turn-key” service.
We can also design, manufacture and revamp other non-standard equipment according to the requirements of users.
If interested, please mail at marketing2@hanrm.com.
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