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TMT Rebar

Introduction

TATA Tiscon 500 D is a high strength ribbed TMT reinforcement bar. The consistency in strength across the rebar is maintained by reducing the impurities like Sulphur and Phosphorous to a level below 0.075%. '500' refers to the strength of the rebar in MPa and 'D' refers to ductility of the rebar. TATA Tiscon 500 D conforms to the latest standards (last revision 2012) set by Bureau of Indian Standards (BIS).

Specification

TATA Tiscon 500 D is manufactured through a superior quality and controlled steel making process to diminish the levels of impurities like Sulphur and Phosphorous. These impurities decrease the strength of steel in extreme hot and cold conditions. Therefore lower these values the better.

TATA Tiscon 500 D is available in sizes from 6mm to 40mm. A comparison chart on specifications of 500, 500 D and BIS standards is mentioned below –

BIS Specifications for Chemical Properties
Chemical Properties
(maximum)
Fe 500 Fe 500-D Tata TISCON 500 D
(Typical Maximum Values)*
% Carbon 0.300 0.250 0.250
% Carbon Equivalent (CE) 0.420 0.420 0.400
% Sulphur (S) 0.055 0.040 0.035
% Phosphorus (P) 0.055 0.040 0.035
% Sulphur & Phosphorus (S&P) 0.105 0.075 0.070
% Nitrogen (PPM) 120 120 120

BIS Specifications for Mechanical Properties
Mechanical Properties
(minimum)
Fe 500 Fe 500-D Tata TISCON 500 D
(Typical Maximum Values)*
Yield Stress- YS (N/mm2) 500 500 500
Ultimate Tensile Stress- UTS (N/mm2) 545 565 600
UTS/YS Ratio 1.08 1.08 1.12

 
* As obtained in 90% of the heats

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Introduction

Buildings and infrastructure in seismic zones have to be better prepared for earthquakes and so have special criteria for reinforcement. TATA Tiscon SD (Super Ductile) high strength ribbed TMT reinforcement bars are particularly suited to meet these requirements. Its superior ductility ensures that it has more pliability and hence, can be bent to a much larger extent. That is, it has a higher threshold of ultimate tensile strength. This is ideal for safety of constructions in frequent earthquake zones.

Specification

Tiscon follows a novel process in the production of TATA Tiscon SD rebars that involves use of special chemicals and treatment post rolling. This makes the rebars more ductile, with great capacity to absorb energy beyond the yield limits. This is an essential quality in preventing collapse buildings during earthquakes.

TATA Tiscon SD is available in sizes from 6mm to 32mm. A comparison chart on specifications Tiscon SD and BIS standards is mentioned below –

TATA Tiscon Super Ductile Rebar Properties
Mechanical Properties
(minimum)
BIS
1786
U.K
B.S.
4449/2005
Australia/
New Zealand
AS NZS
4671/2001
TATA Tiscon Super Ductile
YS Min. MPa Fe-500 500 B 500 C 500N 500 E FE - 500 SD
500 500 500 500 500 500
YS Max. MPa N.S. 650 650 650 600 650
UTS Min. 8% Higher than
YS
8% Higher than
YS
15% Higher than
YS
8% Higher than
YS
15% Higher than
YS
15% Higher than
YS
UTS Max. N.S. N.S. N.S. N.S. 40% Higher than
YS
30% Higher than
YS
UTS/YS Min. 1.08 1.08 1.15 1.08 1.15 1.15
% Total Elongation 12.2
Min.
N.S. N.S. N.S. N.S. 16.0
Min
% Elongation Upto UTS N.S. 5.0
Min.
7.5
Min.
5.0
Min.
10.0
Min.
8.0
Min.
Application General General E.Q.
Zone
General E.Q.
Zone
E.Q.
Zone

 
E.Q. Zone: Earthquake Zone - N.S. Zone: Not Specified - N2: 120 PPM Max

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