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TMT Rebar

Introduction

Fe 500D TMT Reinforcement BarTiscon 500D is a high strength ribbed TMT bar, used for the reinforcement of concrete. The superior strength of this rebar is 500 MPa and 'D' represents its high ductility, thereby explaining the specific nomenclature. Consistency of strength is ensured across the entire length of the rebar as the level of impurities like Sulphur and Phosphorous are maintained below 0.075% in the composition. TATA Tiscon 500 D adheres to the most updated standards (last revision 2012) set by Bureau of Indian Standards (BIS).

Specification

Presence of impurities reduce the strength of steel in extreme temperatures and varying weather conditions. So, owing to lower levels of impurities like Sulphur and Phosphorous, TATA Tiscon 500D has a distinct advantage over other TMT rebars. It is manufactured under controlled processes through ultramodern machinery using latest technology.

TATA Tiscon 500 D is available in sizes from 6mm to 32mm. 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

There has been a rising demand in recent years for TMT rebars with higher strength and better ductility for use in different types of applications. The latest IS 1786: 2008 has addressed these requirements and incorporated changes that were necessary in order to meet latest technological developments in manufacturing steel bars and steel wire.

    Following are some of the important modifications incorporated in the fourth revision:
  • Fe 600 - a new strength grade has been introduced.
  • For elongation, two categories for each grade have been introduced (except for Fe 600).
  • 'Percentage total elongation at maximum force' has been introduced as a new parameter.
  • Nominal sizes have been rationalized.
Chemical Composition of Fe 600 bars
Constituent Percent, Maximum
Carbon 0.30
Sulphur 0.040
Phosphorus 0.040
Sulphur and Phosphorus 0.075

For any grade, including Fe 600, it is not imperative to add micro alloying elements. In case of strengthening elements like Nb, V, B, Ti being used individually or in combination, the total contents shall not exceed 0.30 percent.

Mechanical Properties
SL No. Property Fe 600
1 0.2 percent proof stress/yield stress, Min., N/sq. mm 600
2 Elongation, percent, Min., on gauge length 5.65xSq root of A, where A is the cross sectional area of the test piece. 10
3 Tensile Strength, Min. 6 percent more than the actual 0.2 percent proof stress/yield stress but not less than 660.0 N/sq. mm

 

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Introduction

Super Ductile Rebar from Tata TisconTiscon SD (Super Ductile) ribbed TMT reinforcement bars are particularly appropriate for earthquake prone areas and seismic zones. They have enhanced strength and high ductility, which means that their ultimate tensile strength is greater. As a result, they can be plastically bent out of shape to a much larger extent. This flexibility is an important characteristic or increasing safety of construction in areas where earthquakes occur frequently.

Specification

The ductility of TATA Tiscon SD rebars are increased through a unique process in which the rebar is made to undergo special chemical & post rolling treatment. Tata TISCON Super Ductile rebars possess a remarkable capacity to absorb energy beyond the yield limits, which safeguards a building against potential collapse during earthquakes.

TATA Tiscon SD is available in sizes from 6mm to 40mm. 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 500 N 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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Introduction

The durability of concrete structures depends on how well the concrete can withstand chemical and physical aberrations and protect its embedded reinforcement against corrosion. Environmental exposure, especially to air salinity, impurities in ground water and presence of acid particles in the air are common factors that cause corrosion. The CRSD (Corrosion Resistance Steel with Fe500D properties) rebar from Tata TISCON is an answer to this problem and has been a major innovation breakthrough to help builders and architects.

Tata TISCON CRSD rebars come with a special protective chemistry that creates a shield against corrosion. This protects the life of RCC structures like buildings, bridges, dams and industrial works.

Tata TISCON CRS - Mechanical Properties
  IS:1786 Fe500D Tata TISCON CRSD *
Yield Stress, YS (min, N/mm2) 500 500
% Elongation 16 16
Ultimate Tensile Strength, UTS (min, N/mm2) 565 580

 
*Typical values for 90% of batches

CRS D - Process Technology

The innovative technology used in making Tata TISCON CRSD rebars involves diminishing the Phosphorus (P) content in steel by selecting corrosion resistant elements. Produced using Thermo Mechanical Treatment (TMT) route Tata TISOCN CRSD rebars are compliant with the chemical composition of Fe500D grade. Corrosion resistant qualities in the resulting microstructure are increased due to:

  • Elimination of residual torsional stresses
  • A thin oxide film developing on the steel surface that helps plug holes in the oxide layer
  • Presence of self-tempered lathe martensitic layer on surface that prevents corrosion attack
  • Consistent spreading of corrosion resistant elements from core to surface
Chemical composition of Tata TISCON CRS (in %)
Carbon (max) Sulphur (max) Phosphorus (max) Copper (min)
0.25 0.04 0.04 0.40

 

    Advantages of Tata TISCON CRSD
  • Greater Corrosion resistance makes it more long-lasting
  • High yield strength together with better ductility and bendability
  • More convenience in material handling and transportation
  • No extra operations required during fabrication
  • Easy to weld
  • Can be bend and rebend using very small mandrel

 

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