The difference between steel bars and rebars

These differences reflect the differences between prestressed steel bars and steel bars in terms of material properties, manufacturing processes, and application areas. Prestressed steel bars are mainly used in situations where high strength and special mechanical properties are required, such as in prestressed concrete structures, while rebars are widely used in ordinary building structures.

Prestressing steel bars for concrete are not steel bars. There are several key differences between them:

Chemical composition: The raw materials of prestressed concrete steel bars contain low levels of harmful impurities such as P and S, which are not more than 0.025 respectively; while the P and S contents of steel bars are not more than 0.045 respectively.
Manufacturing method: Prestressed concrete steel bars are obtained by quenching and tempering low-alloy steel hot-rolled wire rods after cold working (or without cold working), while steel bars are hot-rolled.
Mechanical properties: The tensile strength of prestressed concrete steel bars is not less than 1080Mpa, while the tensile strength standard of steel bars is lower.
Process performance: Spot welding joints are not allowed for prestressed concrete steel bars.
Plasticity index: The elongation after fracture and the total elongation at maximum force of prestressed concrete steel bars are much smaller than those of hot-rolled steel bars.
Test requirements: Prestressed concrete steel bars must undergo a 1000-hour relaxation test, while steel bars do not have such requirements.
These differences reflect the differences between prestressed steel bars and steel bars in terms of material properties, manufacturing processes, and application areas. Prestressed steel bars are mainly used in situations where high strength and special mechanical properties are required, such as in prestressed concrete structures, while rebars are widely used in ordinary building structures.