The hot rolled steel coil is a process of forming steel or steel sheets. They have a great influence on the microstructure and properties of steel. The rolling of steel is mainly hot rolling, and the cold rolling is only used to produce small steel and thin steel.
The hot rolling can destroy the foundry structure of the ingot, refine the grain of the steel, and eliminate the defects of the microstructure so that the steel structure is compacted and the mechanical properties are improved. This improvement is mainly reflected in the rolling direction so that the steel is no longer an isotropic body to some extent; bubbles, cracks, and looseness formed during casting can also be welded under high temperature and pressure. The fatigue strength limit of hot rolled products is much better than that of cold-rolled products.
Shandong Hengze New Material Co., Ltd. is not only one of china hot rolled steel coil suppliers, but also hot rolled steel coil manufacturer china with own china hot rolled steel coil factory. Welcome suppliers to come to wholesale hot rolled steel coil. As a hot rolled steel coil manufacturer china with own china hot rolled steel coil factory, We are very familiar with the hot rolled steel coil, let’s talk about what is hot rolled steel coil.
Hot rolling is based on slabs (mainly continuous casting billets), which are heated to form strips from roughing mills and finishing 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. To put it simply, a billet is finely rolled after being heated (that is, the red-hot, hot steel block in the TV), and then trimmed and corrected to become a steel plate. This is called hot rolling.
The difference between hot rolling and cold rolling: hot rolling, with a hot word in front, is definitely related to heat. That is, the steel is heated before the rolling, heated to a high temperature, and rolled at a high temperature.
The advantage of rolling in this way is that the steel is very malleable. Because we all know that when the temperature is high, it will become very soft. At this time, we can arbitrarily make it into what we want. The production process is time-saving, easy to handle, easy to roll, and naturally, The efficiency is also very high, so it is used more in our lives, and after heat treatment, its tensile strength and toughness will be very good.
There are advantages that there must be disadvantages. Because of the higher temperature after deformation plasticity, if the temperature is high, a chemical reaction occurs with the air, and the surface of the steel is oxidized, which causes the surface of the product to be dim, and the steel is grayish black. From the processing point of view: hot rolling is hot processing, hot rolling is rolling above the recrystallization temperature, if the hot-rolled sheet is not pickled, it is similar to the surface of many ordinary steel sheets on the market, and has rust. The surface is red, and the surface that is not rusted is purple-black (iron oxide scale).
Hot rolling is the process of steel under high-temperature conditions. Details Hot-rolled sheet has low hardness, easy processing, and good ductility. The hot-rolled sheet has relatively low strength, the surface quality is almost poor (having low oxidation and smoothness), but the elasticity is good, generally medium and thick plate. Cold-rolled sheet: high strength, high hardness, high surface finish, generally thin sheet, can be used for stamping board. Hot-rolled steel sheets, mechanical properties are far less than cold processing, and secondly forging processing, but have better toughness and ductility.
By definition, steel ingots or billets are difficult to deform at a normal temperature and are difficult to process. Generally, they are heated to 1100 to 1250 ° C for rolling. This rolling process is called hot rolling. Hot rolling, as the name suggests, has a high temperature of the rolled piece, so the deformation resistance is small and a large amount of deformation can be achieved. Taking the rolling of the steel sheet as an example, the thickness of the continuous casting blank is generally about 230 mm, and after rough rolling and finish rolling, the final thickness is 1 to 20 mm.
At the same time, due to the small width-to-thickness ratio of the steel plate, the dimensional accuracy requirement is relatively low, and the shape problem is not easy to occur, and the convexity is mainly controlled. For the organization, it is generally achieved by controlled rolling and controlled cooling, which is, controlling the rolling temperature, finishing temperature and crimping temperature of the finishing rolling to control the microstructure and mechanical properties of the strip. The hot-rolled product is the raw material of the cold-rolled product.
1. Structural steel
Production of general structural steel and welded structural steel, mainly used in the production of steel structural parts, bridges, ships and vehicles.
2. Weather-resistant steel
Special elements (P, Cu, C, etc.) are added, which have good corrosion resistance and atmospheric corrosion resistance, are used in the production of containers and special vehicles and are also used in building structures.
3. Steel for automobile structure
High-strength steel plate with good DRAWING performance and welding performance for automotive FRAME, WHEEL, and other production.
4. Hot-rolled special steel
Carbon steel, alloy steel and tool steel for the general mechanical structure are used in the production of various mechanical parts after heat treatment.
5. Cold rolled original board
Used in the production of a variety of cold-rolled products, including CR, GI, color coated panels.
6. Steel plate for steel pipe
It has good processing performance and compressive strength and is used for the production of internal volume 500! High-pressure gas pressure vessels filled with LPG, acetylene gas and various gases.
7. Steel plate for a high-pressure container
It has good processing performance and compressive strength and is used for the production of internal volume 500. High-pressure gas pressure vessels filled with LPG, acetylene gas and various gases.
In addition, Shandong Hengze New Material Co., Ltd. is a hot rolled steel coil manufacturer china with many years of research and production experience. Welcome to consult hot rolled steel coil prices, wholesale hot rolled steel coil and visit own china hot rolled steel coil factory.