Prestressing steel strands from voestalpine Wire Technology are 7-wire high-performance products with excellent strength, dimensional accuracy, and reliability. They are used worldwide in demanding infrastructure projects—for example, in prestressed prefabricated components, bridges, rock anchors, and heavy-duty lifting technology.
Our strands are available in cross-sections from 52 mm² to 150 mm², with smooth or profiled surfaces. Compacted variants offer up to 165 mm² steel cross-section. All prestressing steel strands comply with the “low relaxation” class and are available with additional corrosion protection such as plastic coating, galvanization, oil, grease, or wax on request.
✔ From ore to wire
✔ 400+ steel alloys
✔ Own R&D facilities
✔ CO2 reduced processes
Applications of prestressed steel strands
Construction industry and infrastructure:
- Pre-stressed prefabricated elements
- Rock anchors
- Retaining walls
- Bridge and tunnel construction
- Stay cable bridges
Oil and gas industry:
- Heavy-duty lifting technology
- Large containers, LNG tanks
Customized wire solutions:
- individual wire development for special industry requirements
- prototypes & small series for research and industry
- material consulting for demanding projects
Technical details on prestressed steel 7-wire strands
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Diameter
Tensile strength Cross sectional area Mass Characteristic value of max. force Max. value of max. force Value of 0,1% proof force D Rm Sn M Fm Fm,max Fp0,1 mm N/mm2 mm2 g/m kN kN kN 15.2 1820 165 1289 300 354.0 264.0 15.2 1860 165 1289 307 353.0 270.0 Advantages of the compacted strand compared to standard strand
- + 18 % more steel crosssection for the same outer strand diameter
- + 13 % higher nominal breaking load and 3% smaller outer diameter compared to strand 150mm2 - 1770 N/mm2
- + 8 % higher breaking load and 3% smaller outer diameter compared to strand 150mm2 - 1860N/mm2
- More effective anchoring, due to higher grip-area of wedges
- Lower surface pressure on HDPE-duct in deflection area, with applicaton of unbounded tendons
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Nominal diameter strand Total mass Mass of components DL M Steel HDPE Wax mm kg/1000 m kg/1000 m 15.3 ≥ 1224 1093 ≥ 82 ≥12 15.7 ≥ 1303 1172 ≥ 82 ≥ 12 Prestressing 7 wire strand galvanzized, waxed, HDPE sheathed for stay cable systems
- Standard: FprEn 10337 or NF A35-035
- Mass of zinc: 190 - 350 g/m2 or 220 - 350 g/m2
- Type of HDPE: HDPE80 / HDPE100 / HDPE100+, different types upon request
- Minimum sheathing thickness: 1.5 mm
- Special types upon request
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Diameter Tensile strength Cross section Mass Characteristics value of max. force Max. value of max. force Characteristic value of 0.1 % proof force Elongation at max. load D Rm Sn M Fm Fm,max Fp0,1 Agt mm N/mm2 mm2 g/m kN kN kN % 15.7 1860 150 1172 279 329 246 > 3.5
Prestressing strand for applications under cryogenic conditions (LNG Tanks)- Standards and rules: fip SR 88/2, ETAG 013, BS 7777-3
- Results of tensile tests under cryogenic conditions available
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Diameter Tensile strength Cross sectional area Mass Characteristic value of max. force Max. value of max. force Value of 0.1 % proof force D Rm Sn M Fm Fm,max Fp0,1 mm N/mm2 mm2 g/m kN kN kN 6.9 1860 29 226.5 51.3 60.5 45.1 9.3 1860 52 406.1 92.0 109.0 81.0 9.3 1960 52 406.1 102.0 120.0 90.8 9.6 1860 55 429.6 97.4 115.0 85.7 12.5 1860 93 726.3 173.0 204.0 152.0 12.9 1860 100 781.0 186.0 220.0 164.0 15.2 1770 139 1086.0 246.0 283.0 216.0 15.2 1860 139 1086.0 259.0 298.0 228.0 15.3 1770 140 1093.0 248.0 285.0 218.0 15.3 1860 140 1093.0 260.0 299.0 229.0 15.7 1770 150 1172.0 266.0 306.0 234.0 15.7 1860 150 1172.0 279.0 321.0 246.0 Please contact us for special requirements.
Surface quality
- Smooth
- Indented
Prestressing steel 7 wire strand galvanized
- Diameter: 9.3 mm - 15.7 mm
- Surface quality: smooth
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Strand diameter Mass Mass of components DL M Steel HDPE Grease mm kg/1000m kg/1000m 12.5 ≥ 825 ≥ 849 730 ≥ 65 ≥ 89 ≥ 30 12.9 ≥ 885 ≥ 908 785 ≥ 68 ≥ 91 ≥ 32 15.3 ≥ 1218 ≥ 1242 1099 ≥ 79 ≥ 103 ≥ 40 15.7 ≥ 1303 ≥ 1335 1178 ≥ 82 ≥ 114 ≥ 43 -
Strand diameter Mass Mass of components DL M Steel HDPE Grease mm kg/1000m kg/1000m 15.2 ≥ 1403 ≥ 1427 1289 ≥ 79 ≥ 103 ≥ 35 Standard minimum HDPE sheath: 1.5 mm or 2.0 mm
- Other HDPE coating thickness upon request
- Waxed version upon request
- Same mechanical characteristics as the wire strand
- Extraction load of straight tendons max. 60 N/m.
- Multiple sheathed strands upon request
Your advantages with voestalpine Wire Technology
- Maximum load capacity & material efficiency: High mechanical strength and compacted strands with up to +18% more steel cross-section for maximum load capacity.
- Precision & dimensional accuracy: Tight tolerances and exact dimensions for reliable prestressing in demanding applications.
- Diversity & flexibility: Wide product range with various diameters, grades, surfaces (smooth, profiled), and coating options.
- Customized corrosion protection: Galvanized, oiled, waxed, or with HDPE/PVC coating – for long-lasting performance even under extreme conditions.
- Certified quality & traceability: Fully integrated production chain, special tests in an accredited laboratory, and complete documentation.
- Technical support & project assistance: Global expert service for special applications such as LNG tanks, stay cable systems, or heavy-duty technology.
FAQ: Frequently asked questions about our prestressing strands
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Prestressed steel strands are high-strength wire ropes used to prestress concrete components. They increase the load-bearing capacity and crack resistance of structures.
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Typical nominal diameters: 15.3 mm and 15.7 mm – other sizes available on request.
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Our prestressing steel strands comply with international standards such as EN 10138 – further specifications are possible on a project-specific basis.
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Dimensional accuracy, strength, surface quality, and uniform strand structure are key criteria for our customers.
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Products comply with FprEN 10138-3 (strands) and are comprehensively tested—including traceability, special tests, and technical customer support.
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Available with oiling, galvanizing, wax or grease coating, and PE/HDPE sheath (e.g., HDPE80/100/100+)
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They offer a larger steel cross-section and higher load capacity—while also having smaller external dimensions. Ideal for improved anchoring and lower surface pressure.
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We supply smooth and profiled 7-wire strands with cross-sections ranging from 52 mm² to 150 mm² or 165 mm² for compacted variants as standard.
Do you have a new project that requires prestressing steel strands?
Our experts will be happy to advise you and find the right solution for your requirements!
