The main difference between the Steel Deformed bar grade 60 and 40 or threaded steel bar is that the latter is much stronger and most commonly used in constructional purposes.
Then again, the 40 evaluation has a yield of 280 MPa or 40 kpsi. 40 evaluation steel has a yield of 280 MPa or 40 Ksi. 60 is a higher evaluation and is the generally utilized evaluation in strengthened cement.
Evaluation 40 methods steel having yield strength of 40Ksi and grade 60 methods steel having yield strength of 60 Ksi. So grade 60 is more grounded than grade 40.
The difference is yield strength 40kpsi versus 60kpsi. On the practical side, in design, you can use a smaller size, or fewer 60 grade bar to achieve the same effect as 40 grade bar. On site, 60 are harder to bend and cut than 40. We will typically use a power bender/cutter for anything larger than 3/4″ grade 60 bar.
Apart from producing the finest cold twisted steel bars in the market, Razaque Steels pioneered the use of hot rolled deformed bars grade 40 & grade 60 (conforming to ASTM A 615) for large infrastructure projects.
As deformed bar grade 40 are rods of steels provided with lugs, ribs or deformation on the surface of bar, these bars minimize slippage in concrete and increases the bond between the two materials. Deformed bars have more tensile stresses than that of mild steel plain bars. These bars can be used without end hooks. The deformation should be spaced along the bar at substantially uniform distances. To limit cracks that may develop in reinforced concrete around mild steel bars due to stretching of bars and some lose of bond under load it is common to use deformed bars that have projecting ribs or are twisted to improve the bond with concrete. These bars are produced in sections from 6 mm to 50 mm dia.