What are the differences between rebar and round steel?
Rebar belongs to the small section steel steel, first used in the skeleton of reinforced concrete building members. In use, it is required to have certain mechanical strength, bending deformation properties and process welding properties. Round steel refers to a round section of solid long steel, round steel is divided into hot rolled, forged and cold drawn three kinds. The difference between rebar and round steel is that the surface is equipped with longitudinal ribs and transverse ribs, generally with two longitudinal ribs and transverse ribs evenly distributed along the length direction.
In construction engineering, round steel and rebar are popular names for different kinds of steel bars, and the differences between them mainly have the following five points:
1. Different shapes. The outer surface of round steel is smooth; The outer surface of the rebar has a spiral rib.
2. Different production standards. In the current standard, round steel refers to HPB235 steel bar, its production standard is "hot rolled smooth steel bar for reinforced concrete" (GB13013); Rebar normally refers to HRB335 and HRB400 grade rebar, its production standard is "Hot rolled ribbed steel bar for reinforced concrete" (GB1499).
3. Different levels of intensity. The design strength of round steel (HPB235) is 210MPa; The strength of rebar is higher than that of round steel, and the design strength of HRB335 is 300MPa; The HRB400 has a design strength of 360MPa.
4. Different types of steel (different chemical composition). Round steel (HPB235) is carbon steel, steel is Q235; Rebar is low alloy steel, HRB335 steel bar is 20MnSi(20 manganese silicon); HRB400 grade rebar is 20MnSiV or 20MnSiNb or 20MnTi, etc.
5. Different physical and mechanical properties. Due to the different chemical composition and strength of steel bars, there are differences in physical and mechanical properties. The cold bending performance of round steel is better, can be 180 degrees of bending hook, rebar can only be 90 degrees of straight hook; The weldability of round steel is better, and ordinary carbon electrode can be used, and low alloy electrode should be used for rebar. Rebar is better than round steel in toughness and fatigue resistance.
Round steel function: 5.5-25 mm small round steel is commonly used as steel bars, bolts and various mechanical parts; Round steel larger than 25 mm, mainly used for the manufacture of mechanical parts or seamless steel blanks.
The main material of round steel: 42CrMo4 round steel, 40Mn2 round steel, T12 steel, 45 round steel
Alloy structural steel: 42CrMo4(1.7225) Executive standard :EN 10083/3-2006, American AISI standard 4140 steel improved varieties, the steel has good workability, easy polishing, easy to bite, and can be electroplated.
Round steel is a long, solid steel bar with a round cross-section. Its specifications are expressed in millimeters of diameter, such as "50" which means round steel with a diameter of 50 mm.
Round steel is divided into hot rolled, forged and cold drawn three kinds.
Characteristics and scope of application: high strength, high hardenability, good toughness, small deformation during quenching, high creep strength and lasting strength at high temperature. It is used to manufacture forgings requiring higher strength and larger quenching section than 35CrMo steel, such as large gear for locomotive traction, supercharger transmission gear, rear shaft, connecting rod and spring clamp with great load, and can also be used for drilling pipe joints and fishing tools in oil deep Wells below 2000m. ① Suitable for integrated forming electrical and electronic molds. ② Plastic mold, mold base. Chemical composition: Carbon C: 0.38 ~ 0.45 Si: ≤0.40 Manganese Mn: 0.60 ~ 0.90 Sulfur S: allowable residual content ≤0.035 Phosphorus P: allowable residual content ≤0.035 Chromium Cr: 0.90 ~ 1.20
Nickel Ni: Allowable residual content ≤0.030 Copper Cu: allowable residual content ≤0.030 Molybdenum Mo: 0.15 ~ 0.30
Mechanical properties; Tensile strength σb (MPa) : ≥1080(110)
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