Put on the bachelor's clothes, took the graduation photos, from now on is a social people, fresh graduates to choose the right career development direction is particularly important.
Lecong has a world-famous "furniture, steel and plastic" three professional markets, Lecong is the country's largest steel trade distribution center, with more than 1190 steel trade company, Lecong steel market covers an area of more than 180 square meters, contributed to the steel trade total of more than 10 million tons, sales network radiation all over the country, with large scale, varieties, customers and good service.
For the initial fresh graduates into the society, the intention to work in the steel industry, you can first understand from the common and commonly used steel, Foshan Wanqing Materials Co., Ltd. to share with you:
Hot rolling is the slab (mainly continuous casting billet) as raw material, on the ingot or billet rolling at high temperature, generally heated to 1100-1250 degrees Celsius, the termination temperature is 800-900, and finally cooled in the air.
Cold rolling refers to the rolling of hot rolled plates at room temperature. Although the steel plate will also be heated up in the process, it is mainly the recrystallization temperature (the lowest temperature of the recrystallization process can be completed within 1 hour of insulation time, which is called the recrystallization temperature.) Rolling is performed as described below.
Aciding plate is an intermediate product with high quality hot rolled sheet as raw material, removing the oxide layer, cutting the edge, and finishing the surface quality and use requirements (mainly cold bending forming or stamping performance) between the hot rolled plate and the cold rolled plate. It is an ideal alternative product for part of the hot rolled plate and cold rolled plate.
Their own characteristics:
Hot rolling can destroy the casting tissue of steel ingot, refine the grain of steel, and eliminate the defects of microtissue, so that the steel tissue is dense and the mechanical properties are improved. This improvement is mainly reflected in the rolling direction, so that the steel is no longer isotropic; the bubbles, cracks and loose air formed during pouring, can also be welded under high temperature and pressure.
After hot rolling, hot rolled steel products, for the thickness and edge width of this aspect is not easy to control. We are familiar with thermal expansion and cold contraction, because at the beginning of the hot rolled out even if the length and thickness of the standard, after the final cooling, there will be a certain negative difference, the wider the negative difference edge width, the thicker the thickness, the more obvious the performance. So for the large steel, for the edge width, thickness, length, Angle, and the edge of the steel line can not be required for too accurate.
Cold rolling due to continuous cold deformation of cold rolling hardening makes the rolling roll strength, hardness rise, toughness index drop, without annealing treatment, its hardness is very high (HRB greater than 90), very poor machining performance, can only be simple directional less than 90 degrees of bending processing (perpendicular to the roll direction) so must pass annealing to restore its mechanical properties.
In the cold rolling process must use cold rolling oil, the advantages of using cold rolling oil are: 1, effectively reduce the friction coefficient, provide the corresponding rolling force, low rolling energy consumption, obtain satisfactory rolling parameters; 2, make the surface brightness is high, uniform rolling thickness; 3, good cooling effect, can quickly take away the rolling heat, protect the roll and rolling parts. Annealing performance is good, will not produce oil burning phenomenon; 4, have a short-term rust prevention performance, can provide temporary rust prevention protection of rolling parts;
Acid washing plate is an intermediate product between hot rolled plate and cold rolled plate. The iron oxide skin on hot rolled steel plate removes a beautiful and smooth surface. The products include low medium and high strength steel for stamping, steel for automobile structure, etc., mainly delivered in the form of steel coil.
Compared with hot rolled plates, the advantages of pickling plates mainly are:
1、The surface quality is good, because of the hot rolled pickling plate to remove the surface of iron oxide skin, improve the surface quality of steel, easy welding, oil and paint.
2、High size accuracy, after leveling, can make the plate type has a certain change, so as to reduce the deviation of Pingdu.
3、Improve the surface finish, enhance the appearance effect.
4、It can reduce the environmental pollution caused by scattered acid washing.
Compared with cold-rolled plate, the advantage of pickling plate is that users can effectively reduce the procurement cost on the premise of ensuring the surface quality and use requirements.
To put it simply, cold rolling, is processed on the basis of hot rolled coil rolling out, is hot rolled- - -pickling- -phosphorus- -saponification- -cold rolling processing process.
The main processes of hot-rolled pickling plate are laser welding, position extension and straightening, turbulent pickling, online leveling, edge cutting, online oil coating and so on.
Cold rolled steel plate has better strength, and hot rolled steel plate has better ductility. Hot rolled steel plate is rolled at high temperature, and cold rolling is rolled at room temperature. Acid washing plate is between cold rolled plate and hot rolled plate performance price ratio is higher than a product, the current market demand is mainly concentrated in the automobile industry, compressor industry, machinery manufacturing industry, zero with processing industry, fan industry, motorcycle industry, steel furniture, hardware accessories, electric cabinet shelves and various shapes of stamping parts, etc.
The future prospect is what we should consider when choosing the industry. The future of the industry is actually your future. Therefore, carefully choosing an industry with a good future prospect is also responsible for your own life.
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