Domestic steel industry commonly shelf models by the Q + number + quality grade, yield point Q represents a yield value behind the figures represent units Map for example! Q235 represents a yield point of 235Map carbon structural steel. There Q195 Q215 common number for the production of low carbon steel wire strength, steel mesh, roof, welded steel pipes, anchor bolts and rivets, Q235 steel has medium strength and good ductility and toughness, and ease of forming and welding. This steel and more for steel and steel parts, also used as a rivet, rail spikes and all kinds of machinery parts, such as bolts, rod, rod and the like. High strength Q255, Q275 steel used for the production of agricultural machinery, also used steel and rail fish plates, shafts, sprockets, gear, hooks and other parts with high strength requirements.
Rolling can be divided according to the characteristics of hot rolling and cold rolling two: hot rolled steel sheet of low hardness, easily processed, good ductility. Hot-rolled steel sheet strength is relatively low, surface quality and almost (oxidation \ finish lower), but plastic, generally plate. Cold-rolled plate: high strength, high hardness, surface finish, usually thin, can be used as punching plate.
Hot-rolled steel sheets and cold-rolled steel production process is different. Hot-rolled steel sheet is rolled together under high temperature; cold rolling is rolling at room temperature. In general, cold rolled steel sheet having a better strength, hot rolled steel sheet having better toughness. Usually cold rolling relatively small thickness, the hot rolling may have a greater thickness. Cold-rolled steel surface quality, appearance, dimensional accuracy are better than hot-rolled sheet, and its products can be rolled thin thickness of about 0.18mm, and therefore more popular. For product acceptance, you can ask professionals. Two kinds of storage shelves are commonly used in primary materials industry. Hot rolled normal thickness 1.5mm-3.0mm commonly used in the production of columns, beams. Normal thickness of 0.6mm-1.5mm cold rolled commonly used in the production of steel plate, beams and uprights.
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