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The homeowner's summary
TMT stands for Thermo-Mechanically Treated. It's the ribbed steel bars you see at construction sites. The number after "Fe" tells you the strength — higher means stronger. The "D" suffix means ductile — critical in earthquake-prone Bengaluru. For a standard home, Fe500D from a reputed brand is the right choice. Never use unbranded steel — you cannot verify its grade.
TMT (Thermo-Mechanically Treated) steel bars are produced by passing hot-rolled steel through a water quenching system. This rapid cooling hardens the outer surface while leaving the core relatively soft and ductile — strong outside, flexible inside.
The ribs (deformations) on the surface create a mechanical bond with concrete, preventing the steel from slipping under load. This is why plain mild steel bars are no longer used in structural construction.
Defined under IS 1786:2008. The Fe number = minimum yield strength in MPa.
Grade
Yield
Tensile
Elongation
Best use
Recommendation
Fe415
415 MPa
485 MPa
14.5%
Minor structures, compound walls
Not recommended for main structure
Fe500
500 MPa
545 MPa
12%
General RCC construction
Basic package — standard residential
Fe500D
500 MPa
565 MPa
16%
Seismic zones, quality residential
Standard package — most projects
Fe550
550 MPa
585 MPa
10%
High-rise, heavy load structures
Premium package — high-rise
Fe550D
550 MPa
600 MPa
14.5%
Seismic zones, high-rise
Premium package — seismic zones
Fe600
600 MPa
660 MPa
10%
Industrial, bridges, special structures
Specialist use only
↑ Fe500D row highlighted — our standard recommendation for Bengaluru residential projects.
Fe500
Standard grade
→Yield strength: 500 MPa
→Elongation: 12% minimum
→Slightly lower cost
→Suitable for non-seismic zones
→Acceptable for compound walls and minor slabs
Fe500D
Ductile grade — recommended
→Yield strength: 500 MPa
→Elongation: 16% minimum — 33% more ductile
→Gives visible warning before failure
→IS code recommended for seismic zones
→Standard spec for all columns, beams, foundations
01Demand the Mill Test Certificate
Every reputed brand provides an MTC with each batch. It certifies chemical composition and mechanical properties. Demand it from your supplier.
02Check IS markings on the bar
Every TMT bar must have the grade (e.g. Fe500D) and manufacturer name rolled into the bar itself. If you cannot read these markings — reject the batch.
03Bend test on site
A properly manufactured TMT bar should bend 180° around a mandrel without cracking. Your site engineer should do this test on each batch.
04Verify weight per metre
12mm Fe500D should weigh approximately 0.888 kg/m. Underweight bars mean less steel — a common fraud that directly reduces structural strength.
05Avoid unbranded steel
Local rolling mills often produce steel that does not meet IS specifications. The cost saving is not worth the structural risk over the life of your building.
06Check for surface rust
Light surface rust is acceptable. Heavy flaky rust or pitting reduces the cross-section area of the bar — reject any bar with deep pitting.
Tata TisconJSW NeosteelJindal PantherSAILKamdhenuVizag SteelRashtriya Ispat NigamEssar Steel
Always verify IS 1786 certification. Brand alone is not sufficient — insist on the MTC for every batch.
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Homekrate specification
Basic
Fe500 — Tata Tiscon or SAIL
Suitable for compound walls and minor structures. Not recommended for main RCC frame.
Standard
Fe500D — Tata Tiscon or JSW Neosteel
Our default for all residential projects in Bengaluru. IS code compliant for seismic zones.
Premium
Fe550D — JSW Neosteel or Jindal Panther
For high-rise structures, seismic zones, or clients who want the highest grade available.
Check today's steel price
Homekrate tracks TMT steel prices daily. See the live per-kg rate on our Market Pulse.