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voestalpine Wire Technology

Best Quality Standards for our Customers

In the prestressing steel sector, we supply prestressing 7-wire strands to meet the most demanding customer requirements. Using an integrated production chain allows us to provide the continuous quality inspections and product traceability needed.

With our prestressing products we are a reliable partner to our customers in the railway infrastructure, construction, energy and precast concrete industries. Our prestressing 7-wire strands are used in products including preloaded prefabricated parts, in bridge construction, as rock anchors, for large containers, or in hoisting technology for lifting heavy loads.

Our prestressing 7-wire strands are supplied with cross-sectional areas ranging from 52 mm² to 150 mm², depending on customer requirements, and with smooth or profiled surfaces. Compacted prestressing 7-wire strands have a cross-sectional area of 165 mm². All strands exhibit very low relaxation.

voestalpine Wire Technology also manufactures a variety of rod dimensions with plastic sheathing. They can be oiled, galvanized, greased or waxed for additional corrosion resistance. Due to their excellent properties, these products are suited for a wide variety of uses.

Prestressing 7-Wire Strands from voestalpine Wire Technology

Our prestressing 7-wire strands are manufactured under ideal processing conditions to ensure they meet the most demanding quality standards.

  • Continuous quality inspections and many special testing options
  • End-to-end traceability of all production and test parameters
  • Greatest possible flexibility as the result of an integrated production chain
  • Strict adherence to schedules, and partnerships with our customers
  • Technical and sales service

Technical Details

  • 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

  • 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

  • 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

  • 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

  • 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

That is what our Customers can build on:

  • Highest quality for our customers
  • Our prestressing steels are the first choice wherever major forces have to be transferred or absorbed reliably and efficiently
  • Surface coating and corrosion protection (zinc coating, plastic coating)
  • Various surface types (smooth, indented, or with special indentation)
  • Special tests are carried out in our accredited laboratories
  • Special applications: LNG tanks, stay cable systems