Low Relaxation Strand
Liberty Steel 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.
Liberty Steel 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
Liberty Steel 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.
Liberty Steel 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 |
