1. Rebar:
·The specification range of rebar is generally 6-50mm. We usually involve 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 28mm, 32mm, 36mm, 40mm, etc. National allowable deviation: 6-12mm deviation is ± 7%, 14-20mm deviation is ± 5%, and 22-50mm deviation is ± 4%.
The screw thread steel is generally 9m and 12m long, of which 9m long screw thread is mainly used for normal road construction and 12m long screw thread is mainly used for bridge construction.
Rebar can be divided into three categories according to strength: HRB335, HRB400 and HRB500.
2. Wire:
Usually the specifications involved are 6.5mm, 8.0mm and 10mm (diameter); 6.0 mm, 7.0 mm and so on. At present, the maximum diameter of wire rod produced in China can reach 30mm. In addition, the allowable tolerance for wire production is generally ± 0.4mm.
The common grades of wire rod are generally divided into Q195, Q215 and Q235, of which only Q215 and Q235 are used for construction steel wire rod; For example: Q235 (Q refers to the yield strength of steel, 235 refers to the yield strength not less than 235mpa).
According to the rolling speed, the wire rod can be divided into general line, high line and high line
3. Spiral screw:
Construction steel, as the name implies, is threaded steel coiled together like wire. Generally, most of them are 6.5-8.0-10-12-14 in the market.
Advantages of spiral screw: the threaded steel is only 9-12, and the spiral screw can be cut as required.
4. Round steel:
Round steel round steel refers to the solid long steel with circular section. The specification is expressed in millimeters of diameter. For example, "50" means round steel with a diameter of 50mm.
Round steel material: 10 #, 20 #, 35 #, 45 #, 304, 316, 20Cr, 40Cr, 20CrMo, 35CrMo, 42CrMo, 40CrNiMo, GCr15, 65Mn, 50Mn, 50Cr, 3Cr2W8V, 20CrMnTi, 5CrMnMo, etc.
Round steel is divided into hot rolling, forging and cold drawing. The specification of hot rolled round steel is 5.5-250 mm. Among them, small round steel of 5.5-25 mm is mostly supplied in bundles of straight bars, which are commonly used as reinforcement, bolts and various mechanical parts; Round steel larger than 25 mm is mainly used for manufacturing mechanical parts or seamless steel tube blanks.
Role of building steel:
Rebar is widely used in various building structures.
In addition to being widely used as reinforcement for building reinforced concrete, wire rod is also suitable for wire drawing and wire mesh (special steel).