What is the difference between grade two and three grade steel?
The grade two steel is HRB335, and the grade three steel is HRB400.
But from the definition we can see more of the same point, all belong to the common low alloy hot rolled ribbed steel bars; belong to (usually said that the rebar); can be used for engineering in reinforced concrete structure.
In fact, from the definition, we can only see that two grade rebar and three grade thread steel is only different in material, one is HRB335, and the other is hrb400.
