1. What is the difference between various grades? Is the manufacturing process same for all grades?
The difference between the grades is in its yield strength. Grade 40 and Grade 60 is manufactured using the same hot rolling process; the difference in strength is achieved by adding more carbon to the grade 60 steel which also makes it more brittle. Xtreme 500 is manufactured utilizing a unique European patented heat treatment process which makes the steel very strong without making it brittle.
2. What grade rod is suitable for a 3/4 storied building?
Under any circumstances Grade 500 Xtreme bar is the best choice for 3 reasons.
It saves money by using less steel and needs less construction man-hours to complete a building.
Secondly, the structure will be sound and will have a longer life. This means a lower life cycle cost.
Last of all the building will be more earthquake resistant due to the lesser quantity of steel used in the beams and columns. This means less re-bar congestion and less likely hood of joint failures in an earthquake.
3. For all grade Re-bar concrete would be same or different?
Concrete compressive strength should always match the yield strength of re-bars. This is necessary to ensure proper structural ductility of the building. Typically for buildings designed with Grade 40 steel a minimum concrete strength of 2200 psi [15 Mpa] is needed. For structures designed on Grade 60 steel concrete strength of a minimum 3000 psi [20 Mpa] is advised. For Grade
4. Why it called Grade-500 though yield strength is 72,500 PSI?
The internationally recognized system of units the ISO for stress is the mega Pascal in short Mpa while the U.S. customary unit is pounds per square inches or psi for short.
