In the construction project, the round steel and the screw steel are popular methods for different kinds of steel. Today, the yuan steel manufacturers explain their differences. The differences between them mainly include the following five points:
1. the shape is different. The outer surface of the round steel is smooth; the outer surface of the screw steel has a spiral rib.
The 2. intensity is different. The design strength of the round steel is 210MPa; the strength of the screw steel is higher than that of the round steel, the design strength of HRB335 is 300MPa, and the design strength of HRB400 is 360MPa.
3. the standard of production is different. The current standard in the round, refers to the HPB235 grade steel, rebar generally refers to HRB335 and HRB400 grade steel, its production is standard hot rolled ribbed steel reinforced concrete.
4. the steel is different, that is, the chemical composition is different. Round steel is carbon steel, steel is Q235; screw steel is low alloy steel, HRB335 grade steel is 20 manganese silicon; HRB400 grade steel is 20MnSiV or 20MnSiNb or 20MnTi and so on.
5. the physical and mechanical properties are different. The agents of Jigang are different in physical and mechanical properties because of the difference in the chemical composition and strength of the steel. The cold bending property of round steel is better. It can make 180 degree crooked hooks. Threaded steel can only be used as a straight hook with a degree of 90 degrees. The weldability of round steel is better than that of ordinary carbon electrode. The low alloy welding rod should be used for threaded steel, and the toughness and fatigue resistance of threaded steel is better than that of round steel.
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