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Low Relaxation Strand

OneSteel manufactures a range of Low Relaxation (LR) Strand products for use in the construction industry.

Low Relaxation Strand is used by the Pre-stressed and Post-tensioned concrete construction industry where large spans are desirable. End uses include bridge beams and planks, viaducts and multi-storey concrete buildings such as shopping centres, car parks and residential apartments.

Low Relaxation Strand is made up of seven plain wires: six outer wires twisted around a central wire. During manufacture the Strand is subjected to an isothermal heat treatment to ensure correct relaxation properties.

OneSteel pays particular attention to quality control in the production of LR Strand, not only of the final product, but throughout processing to ensure a high level of consistency and compliance with Australian Standard AS/NZS 4672 Steel Prestressing Materials.

All LR Strand products manufactured are tested for conformance to AS/NZS 4672 in our NATA registered testing laboratories and this testing is independently accredited by the Australian Certification Authority for Reinforcing Steels Ltd (ACRS).

Diameter range: 9.50mm to 15.70mm

 

Low Relaxation Strand for Mining

OneSteel manufactures a range of LR Strand products suitable for use in the mining industry. They're used for the manufacture of roof bolts which are used in certain roof strata conditions.

LR Strand is made up of seven plain wires: six outer wires twisted around a central wire. During manufacture the strand is subjected to an isothermal heat treatment to ensure correct relaxation properties.

OneSteel pays particular attention to quality control in the production of LR Strand, not only of the final product, but throughout processing to ensure a high level of consistency and compliance with Australian Standard AS/NZS 4672 – Steel Prestressing Materials. All LR Strand is tested for conformance to AS/NZS 4672 in our NATA registered testing laboratories.

Diameter: 9.50mm to 15.70mm

Specifications

LR Strand Specifications
Name / Size 9.5mm Strand 12.7mm Strand 15.2mm EHT Strand 15.7mm Strand
Material Description WST-9.50-LR-STRAND-AS4672-C3000-I-TC WST-12.70-LR-STRAND-AS4672-C3000-I-TC WST-15.20-LR-EHT STRAND-AS4672-3000-I-TC WST-15.70-LR-EHT STRAND-C3000-I-TC
Made to prEN 10138-3        
Material Number 300519 206199 206281 266420
Tolerance on Strand Diameter +/- 0.4 +/- 0.4 +/- 0.4 +/- 0.4
Minimum Breaking Force (kN) 102 184 261 279
Minimum 0.2% Proof Lead (kN) 83.6 151 214 249
Minimum Elongation 600mm GL (%) 3.5 3.5 3.5 3.5
Nominal Area (mm2) 55 98.6 143 150
Nominal Mass (kg/ 1000m) 432 774 1122 1170
Nominal Length (m/ 1000kg) 2315 1292 891 855
Approx. Modulus of Elasticity (Gpa) 195 (+/- 10Gpa) 195 (+/- 10Gpa) 195 (+/- 10Gpa) 195 (+/- 10Gpa)
Coil Weight 3.0 Tonne coils ex stock      
(1.5 Tonne, 2.0 Tonne, 4.7 Tonne, and 6.2 Tonne Made to Order and available on request)        
Lay (or Helix) Right Hand Lay