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Help CenterSteel Wire Rope & Steel Strand，GB/T 5224-2023、ASTM A416、EN10138
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1. Product Overview
Prestressed concrete steel strand is high-strength wire strand manufactured from high carbon wire rod SWRH82B via cold drawing, stranding and stabilizing low-temperature stress relieving treatment. The mainstream structure is 1×7 seven-wire strand, plus 1×2,1×3,1×19 multi-wire specifications. It is classified into three series: smooth low-relaxation steel strand, indented steel strand and hot-dip galvanized anti-corrosion steel strand.
Featuring high tensile strength, large elastic modulus, low stress relaxation rate, good flexibility and strong bonding force with concrete, it is the core prestressed load-bearing material for bridges, high-speed rail box girders, high-rise buildings, rock slope anchoring, nuclear power and wind power tanks.
Core Product Advantages
Adopt premium SWRH82B high carbon steel raw material with high purity, free of inclusion & delamination, stable tensile bearing capacity of whole strand;
Stabilized heat treatment process, low relaxation grade, small stress loss under long-term load, excellent engineering durability;
Full range of diameters & strength grades, suitable for small-span civil buildings to special heavy projects such as nuclear power & wind power;
Optional surface finish: smooth, indented, hot-dip galvanized, covering general concrete bonding & outdoor anti-corrosion anchoring scenarios;
Supplied in large reels with continuous length up to thousands of meters, no joint during tensioning threading to improve construction efficiency;
Mechanical indicators fully comply with national & European/American export standards, SGS/BV third-party tensile & relaxation sampling inspection supported;
Mill Test Certificate (MTC), tensile & relaxation test report delivered together with goods, full ISO & CE certifications and complete customs clearance documents provided.
2. Product Classification & Performance Comparison
2.1 Smooth Low-Relaxation Steel Strand (Mainstream for General Engineering)
Executive Standards: GB/T 5224-2023, ASTM A416, EN10138Production Process: Seven cold-drawn high-strength wires tightly stranded in spiral shape, followed by integral stabilizing stress relieving treatment.Appearance Feature: Smooth metallic silver grey surface, uniform lay length, free of loose wire & twisting knot.Mechanical Property: High strength, relaxation rate ≤2.5%, total elongation ≥3.5%, smooth tensioning, applicable to most prestressed concrete projects.Application: Highway & railway bridges, viaduct box girders, building floor slabs, municipal continuous beams, precast hollow slabs.
2.2 Indented Steel Strand (For High Bond Anchorage)
Production Process: Continuous indentations pressed on single wires before stranding, then stabilized heat treatment.Appearance Feature: Continuous indentations on each wire to greatly increase section friction.Mechanical Property: Same strength & relaxation index as smooth strand, concrete bonding force increased by over 40% to avoid sliding.Application: Rock soil anchor cable, foundation pit support, slope reinforcement, precast component pretension production line.
2.3 Hot-Dip Galvanized Steel Strand (Outdoor Anti-Corrosion, Water Conservancy & Power)
Executive Standard: GB/T 33363Production Process: Single wires hot-dip galvanized first then stranded, uniform & compact zinc coating.Appearance Feature: Silver grey galvanized surface, excellent corrosion & salt spray resistance with long anti-rust service life.Mechanical Property: High strength & low relaxation, zinc coating thickness 80-300g/㎡, resistant to rain, salt alkali & underground water corrosion.Application: Reservoir dam, permanent slope anchor cable, transmission tower guy wire, offshore wind power foundation, coastal anti-corrosion engineering.
Performance Comparison Table
| Comparison Item | Smooth Low-Relaxation Strand | Indented Strand | Hot-Dip Galvanized Strand |
|---|---|---|---|
| Surface Condition | Smooth plain surface | Continuous indentations on single wire | Full hot-dip galvanized coating |
| Concrete Bond Force | Medium | Extremely high, anti-slip | Normal |
| Stress Relaxation Grade | Low relaxation Class 2.5 | Low relaxation Class 2.5 | Low relaxation Class 3.0 |
| Anti-Corrosion Capacity | Only for dry indoor environment | Indoor/underground non-corrosive condition | Outdoor, coastal & underground corrosive environment |
| Tensioning Performance | Smooth with low threading resistance | High threading resistance | Smooth surface & rust-proof |
| Cost Level | Highest cost performance, largest consumption | Medium | High cost, dedicated for anti-corrosion special projects |
| Typical Usage | Bridges, buildings, precast girders | Foundation pit anchor, slope support | Dam, wind power, power guy wire, coastal anchoring |
3. Raw Material, Strength Grades & Executive Standards
3.1 Raw Material
Base high carbon wire rod: SWRH82B, carbon content 0.80%~0.85%, strictly controlled sulfur & phosphorus impurities to guarantee high strength & toughness after drawing.
3.2 Main Tensile Strength Grades
1570MPa, 1720MPa, 1860MPa (global mainstream), 1960MPa, 2060MPa ultra-high strength grade.
3.3 Domestic & International Universal Standards
Chinese Standard: GB/T 5224-2023 (smooth/indented prestressed strand), GB/T 33363 (galvanized strand)US Standard: ASTM A416/A416M; EU Standard: EN10138; International Standard: ISO 6934-4; Japanese Standard: JIS G3536EN10204 3.1 mill test certificate available upon request.
4. Complete Specification Parameters (Standard 1×7 Seven-Wire Structure)
Nominal Common Diameters9.53mm, 12.7mm, 15.20mm (global standard universal size), 15.7mm, 17.8mm, 18.9mm, 21.6mm
Standard Reel Supply LengthStandard reel weight 1.0ton/1.5ton/2.0ton, continuous length per reel 800m~1200m, custom cutting available on demand.
Dimensional ToleranceDiameter tolerance ±0.3mm, uniform lay length without loose wire & jumping wire, no hard bend or twist on whole reel.
Universal Core Mechanical Index (1860MPa Grade 15.2mm)Nominal cross-section area:140mm²; Minimum nominal breaking load ≥260kN; 0.2% proof force ≥228.8kN; Total elongation ≥3.5%; 1000h stress relaxation ≤2.5%.
Optional Surface TreatmentOriginal smooth finish, single wire indentation, full hot-dip galvanizing, epoxy coating anti-corrosion.
5. Industry Application Scope
5.1 Transportation Infrastructure
Prestressed main tendon for highway bridges, railway box girders, viaduct continuous beams, interchange overpasses, precast hollow slabs and secondary tunnel lining.
5.2 Building & Construction Industry
Large-span factory buildings, office buildings, stadium roof prestressed floor slabs, basement anti-floating anchor rod, prefabricated assembly components.
5.3 Rock & Foundation Pit Support
Mountain slope reinforcement, deep foundation pit anchor cable, underground pipe gallery support, anti-floating ground anchor, mine roadway stabilization support.
5.4 Water Conservancy Dam Engineering
Prestressed anchor cable for reservoir dam body, sluice gate reinforcement, river slope protection, permanent anchoring for impervious body (galvanized type preferred).
5.5 New Energy Special Engineering
Prestressed strands for onshore & offshore wind power concrete towers, LNG storage tanks, nuclear containment vessels, photovoltaic support foundation anchoring.
5.6 Electric Power & Communication Industry
Guy wire for high voltage transmission tower, load-bearing cable for signal tower, overhead ground wire galvanized steel strand.
6. Delivery, Packaging, QC & Trade Terms
6.1 Delivery Lead Time
Standard spot smooth 15.2mm steel strand: Shipment within 5-7 working days from Tianjin Port.Custom indented, galvanized, 1×19 large diameter & ultra-high strength strand: 7-15 working days production cycle.
6.2 Export Standard Packaging
Large wooden shaft reels wound with steel strand, 1-2 tons per reel;
Fully wrapped with multi-layer waterproof stretch film, outer woven cloth protection, plastic end rings at both ends to avoid collision damage;
Stacked in 40HC high cube container, wooden spacers between reels for moisture-proof & scratch-resistant sea transportation;
Metal label hung on each reel marked with size, strength, heat number, weight & production date, custom shipping mark printing supported.
6.3 Inspection & Certificates
Original melting report, complete tensile & relaxation test report supplied per batch; SGS/BV third-party on-site tensile sampling test available; Full ISO9001 & CE certification, complete customs clearance documents delivered together.
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