Consistent coil characteristics with uniform winding
Close tolerances on unit mass to length ratio
Higher breaking loads
Higher proof stress loads
Higher fatigue and corrosion resistance
Better performance at elevated temperature
Lower relaxation losses
LRPC
Low Relaxation PC Stranded wires are used in Pre-stressed concrete girders for road, river & railway bridges and flyovers, pre-stressed atomic reactor domes, slabs, silos, hangars, aquaducts, high rise buildings, viaducts & railway sleepers.
Strict adherence to quality assurance and inspection ensures consistency in properties and renders Tata Wiron PC Strand reliable for critical low relaxation pre-stressing jobs. The Quality process defines controls at every stage right from steel to rod to finished product and includes calibration of testing equipment, training of people for continuous improvements and internal audit of the quality system in line with ISO 9001-2000. Quality assurance facilities at the Borivli plant have been accredited by NABL for compliance to ISO/ IEC 17025:1999
Own steel making & wire rod rolling to meet specific chemistry and quality requirements.
Selection of wire rods of specified chemistry and quality.
Quality checks at every stage of production.
In-house relaxation testing facility.
Strands have been successfully tested at independent laboratories for fatigue under dynamic loads and for tensile.
» Approvals
Tata Wiron PC Strand is approved by EMPA, Switzerland for
Cryogenic tensile test at -165°C
Fatigue Test
One-pin Test
Accreditation of Quality Assurance by NABL India, which is recognised by NATA of Australia
Certified to ISO 9001:2000 standards
» Manufacturing Process
» Major Projects of Tata Steel Wire Division
Tata Steel Wire Division is the largest wire manufacturer in the Indian market, catering to pre-stressing strand requirements in the country and abroad. Some of the prestigious projects of the Company have been listed below –
Projects in India
Atomic Power projects - Kota, Kaiga and Tarapur
Flyovers in Mumbai - JJ Flyover
Railway Bridge over Godavari
Delhi Metro Rail Project
LNG tank at Dahej Port
LNG Tanks at Dabhol Power Project
Bangalore Software Technology Park
Subramany Arcade in Bangalore
Cable Stay Bridge at Naini, UP
Overseas projects
Westkon and Dockland Olympic Stadium - Melbourne
South Eastern Motorway Access Bridge - Auckland
Extension Piles - Auckland International Airport
Bank of New Zealand Building - Hamilton
New Zealand's Tallest Tower- Sky Tower, Auckland
Vaiduct from Airport Road to Tampines- Singapore
Bridge across Pandan River - Singapore
» Product Standard
Standards
Common sizes in mm
International Specification
Indian Specification
ASTM A 416
-2000
IS 14268
(Low relation Strand)
- 1995
BS 5896
1980
IS 1983 (Normal Relaxation Strand)
JIS 35 36
-1988
AS 1311
1987
EN 10138:3:2000
(Any other International Specifications and as per
customer requirements)
9.3mm
12.5mm
15.24mm
9.6mm
12.7mm
15.7mm
11.3mm
12.9mm
16 mm
Indian Standard
The Indian standard for uncoated low relaxation seven-ply strand for prestressed concrete is covered under IS 14268-1995. The properties specified in IS 14268: 1995 are as given below:
Indian Standards:IS-14268/1995-CL-1
Typical Load Elongation Curves for Grade 270K Strand
