Rungta TMT Bar Specifications — Grades, Sizes, IS 1786:2008 Properties
All specifications on this page are drawn from IS 1786:2008 — the Bureau of Indian Standards specification for high-strength deformed steel bars and wires for concrete reinforcement. We stock Rungta Steel TMT bars in Fe 500, Fe 500D, and Fe 550, in 8 mm to 32 mm, with a mill test certificate confirming these properties for every consignment.
Mechanical Properties — IS 1786:2008 Minimum Requirements
These are the minimum values mandated by the standard. A conforming mill test certificate must show values at or above these for the declared grade.
| Property | Fe 500 | Fe 500D | Fe 550 |
|---|---|---|---|
| Min. yield strength (0.2% proof stress) | 500 N/mm² | 500 N/mm² | 550 N/mm² |
| Min. tensile strength (UTS) | 545 N/mm² | 565 N/mm² | 585 N/mm² |
| Min. % elongation (gauge 5.65√A) | 12% | 16% | 10% |
| UTS / YS ratio (min.) | 1.08 | 1.10 | 1.06 |
Chemical Composition — IS 1786:2008 Maximum Limits
The standard sets maximum limits on these elements (% by mass). An MTC must report values at or below these limits. Fe 500D has the tightest chemistry — lower carbon and sulphur/phosphorus limits contribute to higher ductility and better weldability.
| Grade | C (max%) | S (max%) | P (max%) | S+P (max%) | Ceq (max) |
|---|---|---|---|---|---|
| Fe 500 | 0.30 | 0.060 | 0.060 | 0.110 | 0.42 |
| Fe 500D | 0.25 | 0.040 | 0.040 | 0.075 | 0.42 |
| Fe 550 | 0.30 | 0.055 | 0.055 | 0.100 | 0.44 |
Ceq = C + Mn/6 + (Cr + Mo + V)/5 + (Ni + Cu)/15. Source: IS 1786:2008 Table 1.
Sizes and Theoretical Weight per Metre
We stock all eight sizes below in Fe 500, Fe 500D, and Fe 550. Theoretical weight uses the standard formula W = D² ÷ 162 kg/m where D is nominal diameter in mm. IS 1786:2008 allows ±7% tolerance on individual bar weight.
| Dia (mm) | Weight (kg/m) | Weight (kg/12m bar) | Bars per MT (12m) |
|---|---|---|---|
| 8 mm | 0.395 | 4.74 kg | ≈211 |
| 10 mm | 0.617 | 7.4 kg | ≈135.1 |
| 12 mm | 0.889 | 10.67 kg | ≈93.7 |
| 16 mm | 1.58 | 18.96 kg | ≈52.7 |
| 20 mm | 2.469 | 29.63 kg | ≈33.7 |
| 25 mm | 3.858 | 46.3 kg | ≈21.6 |
| 28 mm | 4.84 | 58.08 kg | ≈17.2 |
| 32 mm | 6.321 | 75.85 kg | ≈13.2 |
Theoretical values only. Actual weight may vary within IS 1786:2008 tolerances. Use this table to cross-check bar weight and estimate quantities — your bar bending schedule gives the exact order.
How to Read a Mill Test Certificate (MTC)
A Rungta Steel mill test certificate (MTC) is issued per production heat. Here is what each section means and what to check:
1. Heat Number / Lot Number
The unique identifier for the production batch. This links the bars in your delivery to the specific test results on the MTC. If the heat number on the MTC does not match the heat number bundled with your bars, the certificate does not apply to your delivery.
2. Grade and Standard
Confirm the grade (Fe 500 / Fe 500D / Fe 550) and the standard (IS 1786:2008) are what you ordered. A common fraud vector is supplying a lower grade than invoiced — the MTC is your documentary check.
3. Chemical Composition Results
The MTC will report measured values for C, Mn, S, P, Si, and Ceq. Cross-check these against the IS 1786:2008 maximum limits in the table above. If any value exceeds the limit for the declared grade, the batch is non-conforming.
4. Mechanical Test Results
The MTC reports measured yield strength (0.2% proof stress), UTS, elongation (%), and bend test result. Check each against the IS 1786:2008 minimums in the table above. Elongation is particularly important for Fe 500D — the measured value must be ≥16%.
5. Size(s) and Weight
Confirms which nominal diameters the certificate covers. The MTC may also report the actual measured weight per metre — check this against the D²÷162 theoretical weight. IS 1786:2008 allows ±7% tolerance on individual bars and ±5% on a 10-bar sample.
6. Manufacturer Stamp and Date
A valid Rungta Steel MTC will carry the manufacturer's letterhead, authorized signatory, and production date. If these are absent or the document looks like a photocopy of a photocopy, ask for the original or a fresh certificate directly from the distributor.
Our commitment: Premier Steels provides a Rungta Steel mill test certificate with every consignment. If you have questions about interpreting an MTC from us, WhatsApp us — we will walk you through it.
Choosing the Right Grade — Practical Guide for Contractors
Fe 500
Standard residential and commercial construction. G+2 and smaller structures in lower seismic zones. Budget-sensitive projects where structural engineer approves Fe 500.
Fe 500D ← Most specified
Default for multi-storey RCC frames in Delhi NCR (seismic zone IV). IS 13920 ductile detailing typically calls for Fe 500D or higher. Most structural engineers in our region specify Fe 500D as a baseline.
Fe 550
Industrial sheds, warehouses, heavy-load foundations, infrastructure projects. Reduces bar quantity vs Fe 500 by roughly 10% in equivalent designs — a cost benefit on large volumes.
Always confirm grade with your structural engineer. The above is a practical guide — the structural drawings and BBS are the authoritative specification.
Related Pages
- Rungta TMT price today — Delhi NCR & UP — Today's indicative rate ranges for Fe 500, Fe 500D, Fe 550.
- Rungta Steel TMT review 2026 — dealer's guide — Manufacturer background, brand comparison, and our honest distributor view.
- Authorized Rungta TMT dealer in Delhi NCR — How to verify an authorized Rungta distributor.
- Rungta Fe 500D TMT bars — The ductile grade for seismic zones and high-rises.
- Rungta Fe 550 TMT bars — High-strength grade for industrial and heavy-load projects.
Bulk & trade inquiries — Rungta TMT bars
WhatsApp your grade, quantity (MT), and delivery location. We supply Ghaziabad same-day and Delhi NCR next-day. Mon–Sat, 9 AM–7 PM.
Frequently Asked Questions
What does IS 1786:2008 mean on an MTC?
IS 1786:2008 is the Bureau of Indian Standards specification for 'High Strength Deformed Steel Bars and Wires for Concrete Reinforcement.' When an MTC cites IS 1786:2008, it means the producer is certifying that the tested batch meets the chemical and mechanical limits defined in that standard for the declared grade (Fe 500, Fe 500D, Fe 550, etc.).
What is the difference between yield strength and tensile strength?
Yield strength (0.2% proof stress) is the stress at which the steel begins to permanently deform — beyond this point the bar will not return to its original shape. Tensile strength (UTS) is the maximum stress before fracture. IS 1786:2008 requires UTS to exceed yield strength by a defined ratio (1.08 for Fe 500, 1.10 for Fe 500D) to ensure the bar gives warning before failure rather than fracturing suddenly.
Why does Fe 500D cost more than Fe 500?
Fe 500D has tighter chemical composition limits (lower carbon, sulphur, and phosphorus) and a higher minimum elongation (16% vs 12%). The tighter chemistry requires more careful steelmaking, which typically means slightly higher production cost. The price premium at retail is usually ₹2–4/kg. For seismic zone applications the premium is well justified — consult your structural engineer.
How do I calculate how many MT of TMT bars I need for my project?
A structural engineer's bar bending schedule (BBS) gives the exact requirement. As a rough estimate only: a 1,000 sq ft RCC-framed ground floor house typically uses 3–5 MT of TMT reinforcement depending on design, soil condition, and seismic zone. Use the weight-per-metre formula (D² ÷ 162 kg/m) to convert bar lengths to tonnes. WhatsApp us your BBS and we will confirm the exact quantity and rate.
What is carbon equivalent (Ceq) and why does it matter?
Carbon equivalent (Ceq) is a formula combining carbon, manganese, chromium, vanadium, nickel, molybdenum, and copper content. It is a proxy for weldability — the higher the Ceq, the more care is needed when welding or bending. IS 1786:2008 caps Ceq at 0.42 for Fe 500 and Fe 500D, and 0.44 for Fe 550. An MTC reporting Ceq within these limits indicates the bars can be welded and bent on site following standard practice.
What is the standard length of a TMT bar?
IS 1786:2008 specifies bars in standard lengths of 10 m, 12 m, and customized lengths. Most supply from our Ghaziabad yard is in 12-metre lengths. Confirm the required length when ordering, as cutting charges may apply for non-standard lengths.
What tolerances apply on nominal weight of TMT bars?
IS 1786:2008 allows a tolerance of ±7% on the nominal weight per metre for individual bars (measured over a sample). The theoretical weight formula is D² ÷ 162 kg/m. If you receive bars significantly lighter than this, ask for the MTC and check the actual measured weight — under-weight bars are a red flag for under-filled cross-section.
Do you supply mill test certificates (MTC) with every order?
Yes. A Rungta Steel mill test certificate accompanies every consignment dispatched from Premier Steels, without exception. The MTC covers the specific production lot in your delivery and confirms chemical composition and mechanical properties against IS 1786:2008 for the declared grade.