HRB335 Construction steel bars

According to rolling shape

①Smooth steel bars: Grade I steel bars (Q300 steel bars) are all rolled into a smooth round section, and the supply form is coiled, with a diameter of not more than 10mm and a length of 6m~12m.

② Ribbed steel bars: There are three types of spiral, herringbone and crescent shapes. Generally, grade II and III steel bars are rolled into a herringbone shape, and grade IV steel bars are rolled into a spiral shape and a crescent shape. Crescent rib reinforcement: The longitudinal section of the transverse rib is crescent-shaped and does not intersect with the longitudinal rib.

③ Steel wire (divided into low carbon steel wire and carbon steel wire) and steel strand.

④Cold-rolled and twisted steel bars: cold-rolled and cold-twisted.

The smooth round steel bar is actually the small round steel and coil of ordinary low carbon steel. Deformed bars are surface-ribbed bars, usually with 2 longitudinal ribs and transverse ribs evenly distributed along the length. The shape of the transverse rib is spiral, herringbone and crescent shape. Expressed in millimeters of nominal diameter. The nominal diameter of deformed bars corresponds to the nominal diameter of smooth round bars of equal cross-section. The nominal diameter of the rebar is 8-50 mm, and the recommended diameters are 8, 12, 16, 20, 25, 32, and 40 mm. Steel grades: 20MnSi, 20MnV, 25MnSi, BS20MnSi. Reinforcing bars are mainly subjected to tensile stress in concrete. Due to the action of ribs, deformed steel bars have greater bonding ability with concrete, so they can better withstand the action of external forces. Steel bars are widely used in various building structures. Especially large, heavy, light thin-walled and high-rise building structures.

By diameter:

Steel wire (diameter 3~5mm), thin steel bar (diameter 6~10mm), thick steel bar (diameter greater than 22mm).

According to the structure function:

Compression bars, tension bars, erecting bars, distribution bars, stirrups, etc.

Reinforcing bars are now widely used in any building, which provides better evidence for the progress of human beings. It is also the inspection of the quality of steel bars. When the components are reinforced according to the minimum reinforcement ratio, the steel bars are replaced according to the principle of (equal area).