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Help CenterSteel Wire Rope & PC Strand，GB/T 5224, ASTM A416, EN 10138
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1. Product Overview
Steel strand is made by twisting multiple high-strength steel wires tightly together and undergoing stress relief stabilization treatment. It boasts high tensile strength, low relaxation, strong anti-fatigue performance and compact structure. It is a key prestressing material widely applied in bridge engineering, highway construction, high-rise buildings, slope anchoring and other infrastructure projects.
Theoretical weight calculation is provided according to standard specifications for reference.
2. Product Classification & Specifications
2.1 Prestressed Concrete Steel Strand (Main Product)
Executive Standards: GB/T 5224, ASTM A416, EN 10138Common structure: 7-wire strand (6 outer wires wrapped around one central wire, mainstream specification)Standard nominal diameters: 9.53mm, 12.70mm, 15.20mm, 17.80mmStandard length: Custom fixed lengths from hundreds of meters to several kilometers, packed in coilsTensile strength grades: 1720MPa, 1860MPa, 1960MPaFeatures: Low relaxation level, stable elongation, high ultimate tensile forceApplication: Bridge prestressing beams, highway viaducts, high-rise building floor slabs, box girders, municipal overpasses
2.2 Galvanized Steel Strand
Whole strand undergoes hot-dip galvanizing anti-corrosion treatmentApplication: Power transmission overhead ground wire, cable stay for bridges, slope rock anchoring, marine engineering structures
2.3 Unbonded Steel Strand
Equipped with plastic protective sleeve and filled with anti-rust grease insideApplication: Indoor building floor prestressing, underground parking lot, large-span roof slabs
3. Common Material Grades
High-carbon high-strength wire rod raw material, core strength grades as below:
1860MPa Low Relaxation StrandMost universal grade, balanced cost and performance, for most road & bridge prestressing works
1960MPa Super High Strength StrandHigher bearing capacity, suitable for long-span bridges and heavy-load large structures
1720MPa StrandFor low-load anchoring and common small prestressing components
4. Core Technical Indicators
Mechanical PerformanceStrict control of ultimate tensile load, yield load, total elongation and relaxation rate; Class 2 low relaxation type is standard export grade
Surface QualitySmooth steel wire surface without cracks, burrs, scratches; galvanized strand with uniform zinc coating free of bare steel
Structural ConsistencyUniform twisting pitch, no loose wire strands after stress relief treatment, no scattered wires under tension
Inspection DocumentsEach coil is attached with Mill Test Certificate covering tensile strength, relaxation test, diameter tolerance and chemical composition for customs clearance and project acceptance
5. Main Application Fields
Transportation Infrastructure: Highway bridges, railway bridges, viaducts, culverts, box girders
Construction Engineering: High-rise building prestressed slabs, large-span stadium roofs, underground parking structures
Geotechnical Engineering: Mountain slope anchoring, foundation pit supporting, rock bolt reinforcement
Power & Communications: Overhead ground wire, transmission tower stay wire
Special Projects: Marine dock, nuclear power plant supporting structures, municipal tunnel reinforcement
6. Packing, Marking & Delivery
6.1 Export Packing Standard
Each steel strand coil is wrapped with inner anti-rust paper and outer waterproof plastic film, then reinforced with steel strips. Large coils are fixed on fumigated wooden pallets for container shipment to avoid moisture and mechanical damage. Unbonded strands are protected by integral plastic sleeves to prevent grease leakage.
6.2 Marking Content
Each coil is labeled with product type, nominal diameter, tensile strength grade, coil weight, total length, execution standard, factory batch number and manufacturer information.
6.3 Delivery Time (Ship from Tianjin Port)
Conventional stock specifications: 5–7 days loading and shipmentCustom high-strength grades, galvanized & unbonded customized strands: 7–15 days
6.4 Order Terms
MOQ: 1 coil, mixed specifications acceptable; fixed-length cutting service available; trade terms FOB, CIF, CFR; payment term: 30% TT deposit + 70% TT balance before shipment
7. Product Advantages
Raw material high-carbon wire rod with stable chemical composition, uniform strength of every coil
Complete specifications covering 7-wire prestressed, galvanized and unbonded types for all engineering demands
Strict low relaxation heat treatment process, long service life of prestressed structures
Custom length cutting and anti-corrosion processing support to match project construction requirements
Abundant coil stock, fast delivery from Tianjin Port, full official test certificates for export clearance
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