Steel Coil

（1） The sheet product has a flat shape, a large width-to-thickness ratio, and alarge surface area per unit volume. This shape feature brings its use charac-teristics: (1) The surface area is large, so the containment and covering abilityis strong. Products, metal structures, etc. have been widely used; (2) it can becut, bent, stamped, welded, and made into various product components. lt isflexible and convenient to use. lt is extremely important in the automotive,aviation, shipbuilding, and tractor manufacturing sectors. Status; (3) Struc-tural parts such as section steel, steel pipe, large l-beam, channel steel, etc.,which can be bent and welded into various complex sections, are called "uni-versal steel".
（2）The steel plate is a flat steel made by casting with molten steel and press.ing after cooling. it is flat and rectangular, and can be directly rolled or cutfrom wide steel strips. Steel plates are divided by thickness, thin steel plates<4 mm (the thinnest 0.2 mm), medium-thick steel plates 4-60 mm, and ex-tra-thick steel plates 60-115 mm. Steel plates are divided into hot rolling andcold rolling according to rolling. The width of the thin plate is 500~1500mm;the width of the thick is 600~3000mm. Bridge steel plate, boiler steel plate,automobile manufacturing steel plate, pressure vessel steel plate andmulti-layer high pressure vessel steel plate, etc.