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Rebar is a ribbed steel bar, also known as ribbed steel, usually with 2 longitudinal ribs and transverse ribs uniformly distributed along the length. The transverse rib shape is helical, herringbone, crescent 3. Expressed in millimeters of nominal diameter. Nominal diameter of round steel bars of equal diameter equal to the cross section of ribbed bars. The nominal diameter of the steel bar is 8-50 mm, and the recommended diameters are 8, 12, 16, 20, 25, 32 and 40 mm. Ribbed steel bars are mainly subjected to tensile stress in concrete. Because of the function of rib and the greater bonding ability of concrete, ribbed steel bar can bear the effect of external force better. Ribbed steel bars are widely used in a variety of building structures, especially large, heavy, light, thin-walled and high-rise structures.s
There is from the surface quality, the normal inferior steel with adobe rolling, the surface quality is poor, often with surface defects, the overall roughness and the surface color is red; regular steel in the factory when the thread steel and real metal plate corresponding to the marked manufacturers, batch number, specifications and grades of steel, test code.s
Cold drawn steel wire should be the same as round steel and thread steel! Their forming process and the meaning of the place used are different, and the quota is also different, cold drawn steel wire is cold drawn steel wire, strictly speaking, there is no mix together.s
The electrode (coveredelectrode), is the metal coating in the welding core (coating), uniform centripetal pressure applied to core. The core metal cored electrode, in order to ensure the quality and performance of the weld, there are strict rules on the contents of metal elements in the core, especially for harmful impurities (such as sulfur, phosphorus content, etc.) should be strictly restricted, better than the base metal. The electrode consists of two cores and coating composition. The different cores are also different. The core components directly affect the composition and properties of the weld metal, so the harmful elements in the welding core to as little as possible.s
Generally, the thickness of the plane is about 1/30 of the span, and the value is more than 80. The higher the mark of commodity concrete, the higher the price, the different areas are, the average is about 350.s