HPB300 grade: The yield strength of steel bars in this grade is 300MPa, with high plasticity and toughness, suitable for general structural reinforcement and stirrups. HRB335 grade: The yield strength of this grade of steel bars is 335MPa, with high strength and good ductility, suitable for general structural reinforcement and stirrups, especially for projects with high strength requirements.

Carbon steel is the most common form of steel rebar (short for reinforcing bar or reinforcing steel). Rebar is commonly used as a tensioning device in reinforced concrete and reinforced masonry structures holding the concrete in compression.

HRB400 is a steel reinforcement material with high strength and good plasticity. HR stands for "hot rolling", which essentially refers to the heating and rolling process of steel bars in the production process. B represents that its yield strength is 400 megapascals (MPa) higher than that of ordinary carbon steel. HRB400 steel bars are mainly composed of alloys of carbon, sulfur, phosphorus, manganese and other