deformed steel bar steel rebar price decreased dramatically

Steel rebar is the common name for hot rolled ribbed steel bars, or called screw thread steel. H, R and B are the first letters of the words ‘Hot-rolled, Ribbed and Bars’ respectively. Hot rolled ribbed steel bars are divided into three grades: HRB335 (original grade 20MnSi), HRB400 (original grade 20MnSiV, 20MnSiNb, 20Mnti) and HRB500.

Deformed steel bar is called coilded screw steel when delivery in coils. Coiled screw steel is a kind of steel rebars with spiral cross ribs on the surface of the products, which is a kind of construction materials. Steel is broadly divided into plate, section steel and wire, so coiled steel rebars, as the name implies, is rebars that are coiled together like wire. It is bundled in the same way as ordinary wire, but needs to be straightened when used. The length of rebar is only 6-12m, while the length of coiled screw steel can be intercepted at will according to the demand.

There are two common ways to classify steel rebar. One is by geometry shape, according to the cross-sectional shape of the ribs and the spacing of the ribs. In the British Standard (BS4449), for example, reinforced steel bars are classified into Type I and Type II. This classification mainly reflects the grip performance of the rebar. The other way is classifying or grading reinforcement steel barsaccording to performance. China's currently implemented standard GB1499.2-2007 (wire rod for 1499.1-2008), for example, classifies steel rebars into three grades according to the strength level (yield point / tensile strength); Japanese Industrial Standard (JI SG3112), classifies steel rebars into five types according to the comprehensive performance of rebar; British Standard (BS4461) also regulates various grades for steel rebar performance trials. In addition, deformed steel bars can be classified according to its application, such as ordinary reinforcement steel bars for reinforced concrete and heat-treated reinforced steel bars for prestressed concrete.

The nominal diameter of deformed steel bars ranges from 6 to 50 mm, and the standard recommended nominal diameters of steel rebars are 6, 8, 10, 12, 14, 16, 20, 25, 32, 40 and 50 mm. The delivery length is divided into two types: specified length and multiple length. In China, the length of exported steel rebars is from 6 to 12m; in the case of domestic trade, the length is usually 9m and 12m if there is no requirement in the contract.

The general model number in market is mainly 6.5#, 8.0#, 10#, 12#, 14# and normal diameter is 6mm, 8mm and 10mm three model types. The price of coiled ribbed steel bars is a little higher than that of straight steel rebar and wire rod.