tmt bars – What is 500d in TMT bars?

"500D" refers to a specific grade of TMT (Thermo-Mechanically Treated) bars, commonly used in construction. In the context of TMT bars, "500D" typically refers to the yield strength of the bars.

In this grading system:

The number "500" represents the minimum yield strength of the TMT bars in MegaPascals (MPa). In this case, "500" indicates a minimum yield strength of 500 MPa.
The letter "D" indicates that the bars undergo a unique manufacturing process, such as quenching and self-tempering, to achieve the desired mechanical properties.
TMT bars with a grade of "500D" are known for their high tensile strength, ductility, and weldability, making them suitable for a wide range of construction applications where structural strength and durability are essential.