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Meaning hot-rolled sheet is a smelting material, is a sheet. It is mainly composed of continuous hot rolling mill rolling, hot-rolled sheet by continuous rolling mill can also go through the final pickling, annealing, and then roll into a roll, said hot-rolled sheet roll for hot-rolled Coil. Hot-rolled sheet by hot rolling a slab continuous rolling mill to the required thickness of the sheet, which is generally defined as the thickness in the range 1.2 ~ 6mm. Hot-rolled steel sheet is a technical term in the metallurgy industry. Thin steel coil and usually cut into a certain length and width of a single plate market. After the coil unwinding, according to a certain width and length cut, namely hot-rolled sheet. Edit this paragraph uses 1, carbon steel and low alloy hot-rolled sheet class very versatile and widely used in a variety of drawing does not need sheet metal stamping parts and metal products such as: machine housings, switch boxes, filing cabinets and so on, also used as Longitudinal spiral welded pipe and cold-formed steel billet. 2, high-quality carbon structural steel hot-rolled sheet is mainly used for such machinery, transportation, structural parts of the aviation industry with the general stamped metal products. 3, alloy hot-rolled sheet steel is mainly used for such machinery, construction and transportation industries such as structural parts and components. 4, spring steel hot-rolled sheet is mainly used in the manufacture of such machinery, vehicles leaf springs, disc springs and other components. 5, carbon tool steel hot-rolled sheet is mainly used for lower class manufacturing cutting speed, simple shape, low precision cutting tools, measuring tools, molds and other tools. 6, stainless steel with excellent corrosion resistance, such hot-rolled sheet is widely used in aviation, petroleum, chemical, textile, food, medical equipment and other requirements for corrosion resistance of components, containers, machinery and spare parts. Edit the appearance of straight angle straight angle in this paragraph refers to the actual angle of deviation from the four corners of the rectangular plate level. Measurement methods: a corner from steel endpoint for the long side perpendicular to the opposite side (or long side extension cord), resulting pedal steel side of the shortest distance between the upper corner of the endpoint is the ratio of the width of a straight angle, as a percentage He said that generally do not exceed 10%. Plane flatness that is not flat steel surface level. Generally two distances between adjacent wavelength peaks, to connect two peaks and troughs of waves from high, higher than the wavelength of the wave of unevenness. Specific provisions shall refer to the relevant product standard. Camber Camber is the maximum deviation from the straight line of the plate edge, generally used in the concave side of the foot has been measured. Our standard GB / 709-88, and shall not be greater than 3mm per meter. American Standard ASTMA568M-97 provisions with increasing length of the camber of the permissible value increases. Japanese standard JISG3193-90 only specified length conditions, taking into account also the width of the condition. Edit distinguish hot-rolled sheet and cold-rolled sheet in this paragraph 1) cold cold rolled machined surface free from scale, good quality. Hot rolled steel sheet ligation work surface oxide, have lower thickness difference. 2) hot-rolled steel sheet toughness and poor surface smoothness, lower prices, and cold rolled sheet extension is good, there is toughness, but more expensive. 3) rolled into cold-rolled and hot-rolled steel sheet to a recrystallization temperature to distinguish between points. 4) cold rolling: generally used for the production of cold-rolled strip, its high rolling speed. Hot-rolled steel: hot temperature and forging temperature 5) hot rolled steel sheet plated surface is not black and brown, not plated cold rolled plate surface is gray, from the smoothness of the surface can be distinguished after plating, cold rolled plate smoothness higher than hot rolled steel sheet.