Low Relaxation Wire


Low Relaxation Wire

InfraBuild Wire manufactures Low Relaxation Wire with a Chevron Pattern indent in accordance with the Australian Standard AS/NZS 4672 – Steel Prestressing Materials.

The product is a hard-drawn, high-tensile steel wire intended for the prestressing of concrete products. During manufacture the wire is subjected to an isothermal heat treatment process to ensure correct relaxation properties in accordance with AS/NZS 4672.

All InfraBuild Wire Low Relaxation Wire is 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).

The various applications for Low Relaxation Wire include concrete railway sleepers, railway turnouts, bed edging wire and concrete poles and posts.

InfraBuild Wire’s Low Relaxation Wire is compliant for use in Australian Rail Track Corporation (ARTC) projects and has a diameter of 5.03mm


Material Number268955
Material DescriptionWLR-05.03-LR 1700*1950-AS4672-C1500-I-TC
Nominal Wire Diameter – mm5.03
Indent PatternChevron Indent
Indent Depth – mm0.12mm +/- 0.02mm
Tensile Strength – MPa1700MPa minimum and not greater than 1950MPa
Minimum Breaking Load – kN34.2
Min 0.1% Proof Load – kN28.1
Nominal Cross Sectional Area – mm219.9
Nominal Mass/length – g/m (+ 3.1%)156
Nominal Length – m/1000kg6416
Max Relaxation (@ 80% load) - %3
Min Elongation (@ 100% load) (Agt) - %3.5
Nominal Modulus of Elasticity – GPa205 - +5, -10
∑e – mmNot >4.9mm

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