What Is a Deformed Bar?
- A deformed bar is a type of steel reinforcement bar (rebar) used in concrete structures. Unlike plain round bars, it has surface ridges or deformations that enhance its bond with concrete, improving overall structural integrity.

Why Are Grades Important?
- The grade of a deformed bar refers to its yield strength, which is the stress level at which the steel begins to deform permanently. Choosing the right grade is critical for structural safety and performance.

Where to Use Each Grade
Grade 33:
- Light residential buildings, low-load concrete slabs, and non-critical structures.
Grade 40:
- Small to medium structures, beams, slabs, and columns in houses and low-rise buildings.
Grade 60:
- High-rise buildings, bridges, heavy footings, and infrastructure in high-load or seismic zones.

Conclusion
Deformed bar grades directly affect the load-bearing capacity, durability, and safety of your structure. Always select the appropriate grade based on structural requirements, building codes, and environmental conditions.

Sources:
- https://www.ty-steel.com/deformedbar.html
- https://neumannsteel.com.au/what-is-the-quality-standard-of-deformed-bars/
- https://www.infrabuild.com/reinforcing/products/reinforcing-bar/deformed-reinforcing-bar-rebar-class-n/