TYPES OF STEEL BARS
Forms of steel bars
Mild steel plain bars
High strength deformed steel bar
Hard- drawn steel wire fabric conforming bar
Structural steel conforming to grade
MILD STEEL BAR (Fe 250)
The mild steel bars are plain round and hot rolled bars. These bars have plain surface and have sufficient bond at their ends hooks and bends at their ends for anchorages these bar bend easily and weldable . mild steel bars defined yield point. Plain mild steel bars strength 250 N/mm2
2) HIGH YIELD STRENGTH DEFORMED BAR (HYSD)
The cold working process increases both yield as well as the ultimate strength of steel .the yield stress or characteristic stress is given 0.2%proof stress
Increase in tensile strength.
Increase in bond strength (About 60% more the plain round bars.)
HYSDbars of different grade. Fe 415, Fe500, Fe 550 grade
*Advantages of hysd bar
Due to high yield strength, the amount of steel required is considerably reduce .
*disadvantage of hysd
Due to reduction in tension steel the design shear strength of concrete is reduce .
TMT bar (thermal and mechanically treated)
This steel has a defined yield point TMT steel has better properties as compared to common HYSD bars
TMT bars
.
High yield strength
Better weldability
Excellent ductility .
CRS(corrosion resistant steel ) bar
The carbon content in the CRS bars is 0.18% as compared to 0.2% in HYSD bars. The percentage of corrosion resisting elements such as chromium is as 1.5% .in India SAIL and TISCO are producing CRS bars .
CRS bars
3) Steel fabric
Sometimes expanded metal fabric made by welding or weaving steel wire in the form of square mesh are also used as reinforcement in slabs , shells and concrete roads.
Structural steel
For works of large dimensions like massive foundation section like rolled beams ,
channels or angle iron are used as reinforcement.
REBARS
Steel reinforcement are steel bars that are provided in combination with plain cement concrete to make it reinforced concrete. Hence these structures form steel reinforced cement concrete structure (R.C.C). Steel reinforcement is commonly called as ‘rebars’.
