PRODUCT SPECIFICATION, SIZES & WEIGHT - TMT

Nominal Cross-Sectional Area & Mass

Nominal Size (mm)	Cross-Sectional Area (mm²)	Mass per Meter (kg)	No. of pieces/bundle
6	28.3	0.156	19
8	50.3	0.395	10
10	78.6	0.617	7
12	113.1	0.888	5
16	201.2	1.580	3
20	314.3	2.470	2
25	491.1	3.850	1
28	615.8	4.830	1
32	804.6	6.310	1
36	1018.3	7.990	1
40	1257.2	9.850	1

Mechanical Properties

Property	Fe 415	Fe 415 D	Fe 500	Fe 500 D	Fe 550	Fe 550 D
(i) 0.2 percent proof stress (min. MPa)	415.0	415.0	500.0	500.0	550.0	550.0
(ii) Elongation % (min)	14.5	18.0	12.0	16.0	10.0	14.5
(iii) Tensile strength (min)	Fe 415 & Fe 415 D: 10% more than actual 0.2% proof stress or 485 MPa, whichever is more Fe 500 & Fe 500 D: 8% more than actual 0.2% proof stress or 545 MPa, whichever is more Fe 550 & Fe 550 D: 6% more than actual 0.2% proof stress or 585 MPa, whichever is more
(iv) Total elongation at max force %	5

Mandrel Diameter for Bend Test

Nominal Size (mm)	Fe 415	Fe 415 D	Fe 500	Fe 500 D	Fe 550	Fe 550 D
Up to and including 20	3Ø	2Ø	4Ø	3Ø	5Ø	4Ø
Over 20	4Ø	3Ø	5Ø	4Ø	6Ø	5Ø

The diameter of the mandrel shall be as given below:

Nominal Size of specimen	Dia of Mandrel for Fe 415 & Fe 500	Dia of Mandrel for Fe 415 D, Fe 500 D, Fe 550 D
Up to and including 10 mm	50	40
Over 10 mm	76	60

Tolerance and Nominal Mass

Nominal Size	Tolerance on Nominal Mass % (Batch)	Individual Sample (%)	Individual Sample (For coils only)
Up to and including 10	±7	-6	-8
Over 10 up to and including 16	±5	-6	-8
Over 16	±3	-4	-6

Chemical Properties

Constituent	Fe 415	Fe 415 D	Fe 500	Fe 500 D	Fe 550	Fe 550 D
Carbon	0.30	0.25	0.30	0.25	0.25	0.25
Sulphur	0.060	0.045	0.055	0.040	0.055	0.040
Phosphorus	0.060	0.045	0.055	0.040	0.055	0.040
Sulphur & Phosphorus	0.110	0.085	0.105	0.075	0.105	0.075

Note: For guaranteed weldability, Carbon Equivalent (CE) shall not exceed 0.42%:
CE = C + Mn/6 + (Cr+Mo+V)/5 + (Ni+Cu)/15
If micro-alloys are not used, simplified formula: CE = C + Mn/6
CE shall not be more than 0.42 percent. Low hydrogen basic coated electrodes with matching strength bars are recommended.

Permissible Variations from the Limits

Constituent	Variations, Over Specified Maximum Limit Percent, max
Carbon	0.02
Sulphur	0.005
Phosphorus	0.005
Sulphur & Phosphorus	0.010

TMT Division

Girder Division

Furnace Division