IS 1786:2008 (seismic)

Fe 500S TMT Steel Bar

The only grade with a ceiling on yield strength, so plastic hinges form where the designer intended.

Mill test certificate Fe 500S

Standard: IS 1786:2008 (seismic)
Yield stress: 500 (max 625) N/mm² min
UTS: 1.25 x actual yield N/mm² min
Elongation: 18.0% min
Carbon max: 0.25%
S + P max: 0.075%
Bend / re-bend: 4d / 5d
Sizes held: 10, 12, 16, 20, 25, 32 mm

Despatch to any site in IndiaHeat no. on every tag

Specification

Fe 500S specification

Purpose-built seismic grade with a capped upper yield. The only grade with a ceiling on yield strength, so plastic hinges form where the designer intended.

Yield strength: 500 (max 625) MPa min
Tensile strength: 1.25 x actual yield MPa min
Elongation: 18.0% min
TS / YS ratio: 1.25 min

Mechanical and chemical requirements for Fe 500S under IS 1786:2008 (seismic). These are the minimums we test against before a load is released.
Property	Requirement	Why it matters on site
0.2% proof / yield stress	500 (max 625) N/mm² min	Sets how much load each bar carries, so it drives the steel quantity in your design
Ultimate tensile strength	1.25 x actual yield N/mm² min	The reserve above yield before the bar actually breaks
TS / YS ratio	1.25 min	A higher ratio means the structure warns you before it fails
Elongation on gauge length	18.0% min	How far the bar stretches before fracture — this is what lets you bend it on site
Bend test	4d / 5d	No cracking on the outside of the bend at the specified mandrel
Re-bend test	5d / 7d	Catches embrittlement after ageing, which is where cheap bar fails
Carbon	0.25% max	Lower carbon means better weldability and less brittleness
Sulphur	0.040% max	Excess sulphur causes hot shortness and cracking
Phosphorus	0.040% max	Excess phosphorus makes the bar brittle in cold weather
Sulphur + phosphorus	0.075% max	The combined limit is the single best indicator of primary versus secondary steel

Fe 500S weight chart

Sizes of Fe 500S we hold, with nominal sectional area and unit weight. Actual weight is checked on our weighbridge and held inside ±2% of these figures.
Diameter	Area (mm²)	Weight (kg/m)	Per 12 m bar (kg)	Bars per tonne
10 mm	78.5	0.617	7.40	135
12 mm	113.1	0.888	10.66	94
16 mm	201.1	1.580	18.96	53
20 mm	314.2	2.470	29.64	34
25 mm	490.9	3.850	46.20	22
32 mm	804.2	6.310	75.72	13

Where Fe 500S is the right call

Best used for: Ductile detailing to IS 13920, hospitals, schools and critical buildings in Zone IV and V.

Think twice about: Ordinary commercial work where the premium is not recovered.

Fe 500S suppliers by city

Every city page carries the local delivery position, lead time and freight note.

Other grades

Compare against the rest

Fe 415415 MPa · 14.5% elong. Fe 415D415 MPa · 18.0% elong. Fe 500500 MPa · 12.0% elong. Fe 500D500 MPa · 16.0% elong. Fe 550550 MPa · 10.0% elong. Fe 550D550 MPa · 14.5% elong. Fe 600600 MPa · 10.0% elong. Fe 500 CRS500 MPa · 12.0% elong.

Questions

Fe 500S — common questions

What does Fe 500S mean?

Fe is iron, the number is the minimum yield strength in newtons per square millimetre. Fe 500S therefore yields at no less than 500 (max 625) N/mm².

Where is Fe 500S used?

Ductile detailing to IS 13920, hospitals, schools and critical buildings in Zone IV and V.

What is the elongation of Fe 500S?

18.0% minimum on the specified gauge length under IS 1786:2008 (seismic). Elongation is what lets the bar be bent on site without cracking, and it is the number to check before you accept a cheaper alternative.

Is Fe 500S available in all diameters?

We hold 10, 12, 16, 20, 25, 32 mm in 12 metre lengths. Anything outside that is rolled to order against confirmed tonnage.

What is the minimum order quantity?

Five tonnes for delivered loads. Below that you are welcome to lift from our stockyard directly, and we will still issue the mill test certificate.

How is the price fixed?

Basic rate per tonne, plus GST at 18%, plus freight to your site. We quote the three separately so you can see exactly what you are paying for.

Do you supply mill test certificates?

Yes, with every despatch. The heat number on the certificate matches the tag on the bundle, so it survives an audit.