Threaded steel coils are rebars that are coiled together like wire rods, and are also a kind of steel for construction.

The second, third, and fourth grades of rebar are all old names before, and the new standards are called HRB400 and HRB500 respectively, which are classified according to the strength level (yield point/tensile strength), and the numbers behind are the strength values , the unit is Mpa. H, R, and B are the English initials of the three words Hotrolled, Ribbed, and Bars, respectively. Finished threaded steel bar refers to the threaded steel bar for prestressed concrete, which belongs to the steel for construction. As the name suggests, coiled snails are rebars that are coiled together like wires, and they are also steel for construction.