According to its strength grade, hot rolled steel bars can be divided into several grades. What are the representative symbols of all levels of steel bars? What is the difference between the strength and deformation performance of steel bars at all levels?

according to its strength, hot-rolled steel bars are only divided into strength grades, regardless of grade I, II, III and IV.

HPB3 yield strength standard value 3Mpa elongation ≧24%

HRB335? Yield strength standard value 335Mpa elongation ≧17%

HRB4? Yield strength standard value 4Mpa elongation ≧16%

HRB5? Yield strength standard value 5Mpa elongation ≧15%

Representative symbols are shown in the picture.