Alloy steel plate
Steel plates are flat, rectangular, and can be directly rolled or cut from wide steel strips.
Steel plates are divided by thickness, thin steel plates are <4 mm (the thinnest is 0.2 mm), thick steel plates are 4 to 60 mm, and extra thick steel plates are 60 to 115 mm.
Steel plates are divided into hot rolled and cold rolled. The width of thin plates is 500~1500 mm; the width of thick plates is 600~3000 mm. Thin plates are divided by steel type, including ordinary steel, high-quality steel, alloy steel, Spring Steel, Stainless Steel, tool steel, heat-resistant steel, Bearing Steel, silicon steel and industrial pure iron thin plates; according to professional use, there are plates for oil drums, Enamel plates, bulletproof plates, etc.; according to surface coating, there are galvanized sheets, tin-plated sheets, lead-plated sheets, plastic composite steel sheets, etc.
The steel grade of thick steel plate is roughly the same as that of thin steel plate. In all aspects of products, in addition to bridge steel plates, boiler steel plates, automobile manufacturing steel plates, pressure vessel steel plates, and multi-layer high-pressure vessel steel plates, which are purely thick plates, some types of steel plates, such as automobile girder steel plates (thickness 2.5~10 mm), patterned Steel plates (thickness 2.5~8 mm), stainless steel plates, heat-resistant steel plates and other varieties are intersected with thin plates.
In addition, steel plates also have materials. Not all steel plates are the same. The materials are different, and the places where the steel plates are used are also different.
The difference between carbon steel and alloy steel plates
Carbon steel mainly has the following shortcomings in performance:
(1) Low hardenability. Generally, the maximum hardenable diameter of carbon steel through liquid quenching is only 10mm-20mm.
(2) The strength and yield strength are relatively low. For example, the σs of ordinary carbon steel Q235 steel is 235MPa, while the σs of low alloy structural steel 16Mn is more than 360MPa. The σs/σb of 40 steel is only 0.43, which is much lower than that of alloy steel.
(3) Poor tempering stability. Due to poor tempering stability, when carbon steel is quenched and tempered, in order to ensure higher strength, a lower tempering temperature needs to be used, so that the toughness of the steel is low; in order to ensure better Toughness and strength are low when using high tempering temperatures, so the comprehensive mechanical properties of carbon steel are not high.
(4) Unable to meet special performance requirements. Carbon steel is often poor in oxidation resistance, corrosion resistance, heat resistance, low temperature resistance, wear resistance and special electromagnetic properties, and cannot meet special performance requirements.
