Steel plate is made of molten steel and cooled and pressed into flat steel. It is flat, rectangular, and can be directly rolled or cut by wide strip. Plates are divided by thickness, thin steel plates < 4 mm (thinnest 0.2 mm), medium and thick steel plates 4-60 mm, and extra-thick steel plates 60-115 mm.

The steel plates are divided into hot rolling and cold rolling according to rolling. The width of the sheet is 500~1500 mm, and the width is 600~3000 mm thick. The thin plates are divided into general steel, high-quality steel, alloy steel, spring steel, stainless steel, tool steel, heat-resistant steel, bearing steel, silicon steel and industrial pure iron sheet, etc. According to the professional use, there are oil drum sheet, enamel sheet, bullet-proof sheet, etc. According to the surface coating, there are galvanized sheet, tin sheet, lead-plated sheet, etc. Plastic clad steel plate and so on.

Thick steel plates are generally the same as those of thin steel plates. In all aspects of products, in addition to bridge steel plate, boiler steel plate, car-made steel plate, pressure vessel steel plate and multi-layer high pressure vessel steel plate and other types of pure thick plate, some types of steel plate such as car girder steel plate (2.5-10 mm thick), striped steel plate (2.5-8 mm thick), stainless steel plate, heat-resistant steel plate and other types of the same thin plate wearing. Plugged in.

In addition, the steel plate and raw materials said, not all the steel plates are the same, the raw materials are different, its steel plate used in different places.
With the development of science and technology and industry, higher requirements have been put forward for data, such as higher strength, resistance to high temperature, high pressure, low temperature, corrosion resistance, wear and other special physical and chemical functions. Carbon steel can not completely meet the requirements.

Lack of carbon steel:

(1) low hardenability. In general, the maximum quenching diameter of carbon steel quenched by water is only 10mm-20mm.

(2) intensity and flexor strength were lower. For example, the_s of Q235 steel is 235 MPa, while that of 16Mn low alloy structural steel is more than 360 MPa. The sigma S / sigma B of 40 steel is only 0.43, much lower than that of alloy steel.

(3) tempering stability is poor. Because of the poor tempering stability, in order to ensure a higher strength, carbon steel needs to choose a lower tempering temperature, so the steel's resistance is low; in order to ensure a better resistance, choose a higher tempering temperature when the strength is low, so the comprehensive mechanical function of carbon steel is not high.

(4) the special function is not satisfied. Carbon steel is often poor in oxidation resistance, corrosion resistance, heat resistance, low temperature resistance, wear resistance and special electromagnetic properties, and can not meet the special functional requirements.

Steel plate sales company Tangshan Jinzheng Steel Co., Ltd. is mainly engaged in medium and heavy plate, hot rolled coil plate, open plate, pattern plate and Tangshan I-beam, channel steel, angle steel, H-beam, high-frequency welded pipe, screw steel, steel and so on. On the basis of many years of steel trade and rough processing, large-scale numerical control fine plasma, laser and flame cutting equipment is introduced to precisely cut, process and produce all kinds of special-shaped steel products, and to carry out thick plate longitudinal shearing, filling the gap that can not be realized by strip longitudinal shearing equipment.