What is deformed steel bar

Deformed steel bar is the common name of hot rolled ribbed steel bar. The grade of ordinary hot-rolled steel bars consists of HRB and the minimum yield point of the grade. H. R and B are the first letters of the three words hot rolled, ribbed and bars respectively.

Hot rolled ribbed steel bars are divided into three grades: Grade II HRB335 (old brand: 20MnSi), Grade III HRB400 (old brand: 20MnSiV, 20MnSiNb, 20Mnti) and Grade IV HRB500.

Screw thread steel is a kind of steel that must be used for building components above medium size. The ordering principle of screw thread steel is generally based on meeting the requirements for grip performance required by engineering design, with the mechanical process performance or mechanical strength index as the main index.