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Due to the fact that the billet is adobe and has many pores, cracks occur in the course of cooling due to thermal stress, and cracks occur after rolling.5. inferior steel due to poor equipment manufacturers, easy to produce burr, scraping the surface of steel. Deep scratches reduce the strength of the steel.s
Main origin: steel manufacturers in China are mainly distributed in the north and northeast, North China, Tang Gang, such as Shougang steel, bearing steel, such as the northeast, north of Fushun Steel resistant, etc., these two regions accounted for more than 50% of the total output of thread steel.The difference between round bar and round bar is that the surface has longitudinal ribs and transverse ribs, usually with two longitudinal ribs and transverse ribs uniformly distributed along the length direction. The rebar is a kind of small section steel, mainly used for the skeleton of reinforced concrete construction members. In use, some mechanical strength, bending deformation property and welding performance are required. The raw steel billet for the production of threaded steel is carbon structural steel or low alloy structural steel which is treated by calm melting, and the finished steel bar is delivered in hot rolling forming, normalizing or hot rolling state.s
The theoretical weight of threaded steel and round steel is the same. The middle part of the steel bar size ratio is small, the design time actually unit weight are the same, just screw steel crescent and transverse ribs prominent, resulting in heavy steel should be better than the illusion of formula is 0.00617 multiplied by the square of the diameter / m.s
Steel is produced by a small rolling mill, rolling mill main types are divided into: continuous and semi continuous and open train. New and used in the world, mostly continuous small rolling mill. Popular steel mills have universal high-speed rolling mills and 4 slitting high yield mills.s
Suppose the present price of the steel thread is 2515 yuan, this is the price per ton, the thread steel is 10 tons per hand, the contract value is 25150 yuan, the margin ratio is about 8%, so it will cost 2012 yuan to do one hand thread steel.s
Round bar is the finished steel hot rolling and cooling, by ordinary low carbon steel and alloy steel under the condition of high temperature pressing, mainly used for reinforcement of reinforced concrete and prestressed concrete structure, is one of the varieties of steel used in civil engineering in the largest amount.s