HRB400 and HRB335 steel bars refer to the HRB400 and HRB335 steel bars in the current national standard "Hot rolled ribbed steel bars for reinforced concrete" GB 1499;

HRB400 is commonly known as Grade III steel, and HRB335 is commonly known as Grade II steel.

The designed tensile strength of HRB335 is 3 10n/mm2.

The design value of tensile strength of HRB335 is 360n/mm2.

This is not a question of good or bad.

Generally, beams and columns are made of secondary steel, and plates are made of tertiary steel.

Grade III steel has a smaller diameter, such as 8, 10. But secondary steel didn't.