Tmt steel

14,443 views

Published on

Published in: Business
0 Comments
11 Likes
Statistics
Notes
  • Be the first to comment

No Downloads
Views
Total views
14,443
On SlideShare
0
From Embeds
0
Number of Embeds
9
Actions
Shares
0
Downloads
717
Comments
0
Likes
11
Embeds 0
No embeds

No notes for slide

Tmt steel

  1. 1. TMT STEEL<br />
  2. 2. TMT is "thermo mechanically treated steel"<br />The name is derived from the metallurgical process called thermo-mechanical treatment that integrates work hardening and heat treatment into single process.<br />ADVANTAGE OF THIS PROCESS IS THAT BARS DO NOT NEED COLD TWISTING AND HENCE THESE BARS SHOW EXCELLENT RESISTANCE TO CORROSION. <br />
  3. 3. APPLICATIONS<br />General purpose concrete re-enforcement structures<br />Bridges<br />Flyovers<br />Dams<br />High rise buildings<br />Industrial structures<br />Concrete roads<br />
  4. 4. COMPOSITION<br />CARBON-0.3%<br />SULPHUR-0.05%<br />MANGANESE-0.5-1.2%<br />PHOSPHORUS-0.05%<br />
  5. 5. MECHANICAL PROPERTIES<br />TENSILE STRENGTH-630N/mm2<br />YIELD STRENGTH-520N/mm2<br />ELONGATION-22%<br />
  6. 6. NEED OF TMT BARS<br />TMT bars are used as reinforcement in the concrete.<br />Concrete shows good compressive strength but poor tensile strength which demands for reinforcement.<br />Desired properties of reinforcement are:<br />1.High strength<br />2.High tensile strain<br />3.Good bond to the concrete<br />4.Thermal compatibility<br />5.Durability in the concrete environment<br />
  7. 7. Manufacturing process<br />Manufacturing process of TMT bars can be better described as “Hot Rolling” where heated iron billets continuously pass through the rollers of decreasing diameter .<br />
  8. 8. TMT process<br />After coming out of the last rolling mill bars are water cooled in a microcontroller controlled quenching chamber where temperature gradient is produced in from core to surface.<br />After the intensive cooling, the bar is exposed to air and the core re-heats the quenched surface layer by conduction, therefore tempering the external martensite. When the bars are taken out of the cooling system, the heat flows from the core to the outer surface, further tempering of the bars, which helps them attain a higher yield strength.<br />
  9. 9.
  10. 10.
  11. 11. Properties<br />Due to such unique composition TMT bars show excellent tensile strength, bendability, ductility.<br />Good corrosion resistance and excellent bonding strength with concrete.<br />
  12. 12. Alloying elements<br />Sulphur<br />Phosphorus<br />Manganese<br />Carbon <br />
  13. 13. Where do we stand?<br />
  14. 14. Future<br />India is expected to increase its per capita steel consumption to 100kg<br />But barrier in doing so is India is net importer of coak but has enormous amount of iron oars.<br />Being a developing economy both India and china will continue to demand more and more steel for infrastructure and civil engineering <br />
  15. 15. Reference<br />http://www.concretebasics.org/articlesinfo/tmt6.php<br />http://en.wikipedia.org/wiki/Reinforced_concrete<br />http://www.rajuristeel.com/products.htm#tmt<br />http://www.kalikasteels.com/tmt_bar_production.html<br />http://handk-india.tripod.com/id3.html<br />

×