The iron and steel production process in China will start from the middle stage. Is the process of melting and casting.
Mineral dressing means Processing of ores by making ores of suitable properties and sizes for smelting. It starts with separating iron from other foreign matter. The separation of iron involves a variety of processes, including the method of grinding ore to separate the iron. Separation may be performed by using the difference of specific gravity (Float) or using magnetic separation (Magnetic separation). The minerals obtained from the separation are quite finely sized, so they must be lumped. (Agglomeration) before the smelting furnace.
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Iron smelting means the removal of impurities contained in iron ore to give the iron more purity. And has a higher percentage of iron
Iron smelting means heating of porous iron, smelting iron (Pig iron) or scrap iron at a high temperature of about 1600 ° C to make the steel smelt. In the steel melting process of this steel production It is a step to reduce the carbon and phosphorus content by oxidation method. And improve the chemical composition of iron by adding various compounds To reduce the amount of impurities or slag, which is mainly oxide compounds. Silicates of various elements To separate from metal water This procedure allows manufacturers to obtain the required steel specifications.
Iron casting refers to pouring steel into a design to harden the steel into various shapes. The steel that will be able to be cast must go through the process of melting and flavoring the mixture already.
Ingot casting is the casting of iron into a metal ingot. In this way, the molten steel water is poured into a stationary mold.
Continuous casting or continuous casting is the casting of iron as a semi-finished product such as Billet, Bloom or Slab by bringing molten iron water to flow through the mold continuously until it harden. This semi-finished product can be trimmed and processed.
As the continuous casting method can improve the quality of the steel, it also improves the productivity. Increase the efficiency of investment And can lead to an increase in yield ratio continuous casting is a very popular method at present.
Processing refers to the process of forging steel to the desired size and shape by processing. Moreover, the processing process is the use of steel to improve the product properties. There are two types of processing: hot processing and cold processing.
The introduction of steel products through continuous industrial processes To produce products that are diverse and suitable for use. Those steel products must be processed first. Then you can bring to the process industries, for example, pressure vessels, construction materials, containers, pipes, automotive parts and electrical machinery , mechanical and so on.
In the part of the steel sheet that has been hot rolled and then Can be used directly for some types But if a thinner sheet is needed, it can be done by cold rolling to reduce the size and to get the required thickness. Cold rolling is also useful for steel sheets in other areas, such as rolling to improve surface quality. To obtain less thickness than hot rolled steel To obtain the required mechanical properties And to control the thickness tolerances low.
Because cold rolling has a relatively higher cost than hot rolling. Therefore, most of the production of thin steel has a process starting from hot-rolled steel to a certain size first. After that, it will continue to cool.