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Help CenterSteel Wire Rope & Steel Strand，ASTM A416、EN 10138、ISO 6934
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1. Product Overview
Prestressed steel strand is made of multiple high-carbon steel wires twisted together and stabilized by stress relief treatment. It features high tensile strength, low relaxation, good flexibility and stable mechanical properties. It is the core prestressing material widely used in infrastructure construction.We supply 1×7 standard prestressed steel strand, galvanized steel strand, epoxy coated steel strand and unbonded steel strand, conforming to GB, ASTM, EN and ISO standards.
2. Executive Standards
Domestic GB Standards
Prestressed concrete steel strand: GB/T 5224-2014
International Standards
ASTM A416, EN 10138, ISO 6934SGS third-party test reports can be provided to meet export inspection requirements.
3. Material Grade & Classification
3.1 Ordinary Low-Relaxation Prestressed Steel Strand
Common nominal diameters: 9.53mm, 12.7mm, 15.2mm, 17.8mmTensile strength grades: 1720MPa, 1860MPa, 1960MPaFeatures: High strength, low relaxation, cost-effective, widely used in bridges, viaducts, high-speed rail and buildings.
3.2 Hot-Dip Galvanized Steel Strand
Whole strand hot galvanized, strong anti-corrosion capacity, applied to cable-stayed bridges, overhead power lines, slope stabilization projects and offshore structures.
3.3 Epoxy Coated Steel Strand
Epoxy resin coating on single wire or whole strand, excellent anti-corrosion, suitable for marine, coastal and high humidity corrosive environments.
3.4 Unbonded Prestressed Steel Strand
Equipped with HDPE outer sheath and internal anti-rust grease, used for floor slabs, underground parking lots and municipal overpasses.
4. Specification Parameters
4.1 Structure
Main structure: 1×7 (6 outer wires twisted around one central wire)
4.2 Common Sizes & Technical Data
9.53mm: Nominal cross-sectional area 54.8mm², minimum breaking load ≥93.1kN (1860MPa)
12.7mm: Nominal cross-sectional area 98.7mm², minimum breaking load ≥172kN (1860MPa)
15.2mm: Nominal cross-sectional area 140mm², minimum breaking load ≥260kN (1860MPa)
17.8mm: Nominal cross-sectional area 191mm², minimum breaking load ≥355kN (1860MPa)
4.2 Standard Coil Weight & Length
Standard coil weight: 1.0 ton / 1.5 ton / 2.0 ton per reel; length customized according to customer demand.Coil inner diameter ≥800mm to avoid wire deformation.
4.3 Surface State
Plain steel strand: Bright metallic finish with anti-rust grease coated, standard type for concrete prestressing.
Galvanized strand: Uniform zinc layer without missing coating, peeling or lump zinc.
Epoxy coated strand: Smooth intact epoxy coating without crack or shedding.
Unbonded strand: Smooth HDPE sheath, full and uniform internal anti-rust grease filling.
4.4 Performance Index
Elongation after fracture ≥3.5%
1000h relaxation loss ≤2.5% (low relaxation grade)
No loose wire, broken wire, jump wire or untwisting after twisting and stabilization.
5. Core Product Advantages
High-quality raw material: High-carbon high-speed wire rod from major steel mills, stable chemical composition, complete traceability of heat number and MTC documents.
Advanced production process: Computer controlled stranding and stress relief stabilization, uniform twist pitch, consistent mechanical performance of each coil.
Multiple anti-corrosion types: Plain, galvanized, epoxy coated and unbonded strands to match various engineering and corrosive environments.
Complete size & strength grades: Full stock of mainstream diameters and tensile grades, supporting mixed reel delivery.
Export seaworthy packaging: Wrapped with anti-rust VCI film, fixed with steel straps, wooden pallets optional to prevent collision and moisture during sea transportation.
Fast delivery: Standard 15.2mm 1860MPa plain steel strand in stock for delivery within 3 days; galvanized, epoxy coated and customized strands loaded at Tianjin Port within 5–7 days.
6. Main Application Fields
Traffic Infrastructure: Highway bridges, viaducts, high-speed railway box girders, cable-stayed bridges, suspension bridges, municipal overpasses.
Construction Engineering: High-rise building floor slabs, transfer beams, large-span stadiums, underground parking lots, precast components.
Municipal & Water Conservancy: Retaining wall slope stabilization, reservoir dams, aqueducts, tunnel support structures.
Power Communication: Overhead transmission line ground wire, power tower stay wire.
Offshore & Coastal Projects: Sea crossing bridges, coastal wharves, offshore wind power foundation anchoring components.
7. Delivery Condition
Plain prestressed strand: Stress relieved, coated with anti-rust grease, wound on steel reels for direct use in tensioning construction.
Galvanized strand: Hot-dip galvanized after stranding, for outdoor anti-corrosion projects.
Epoxy coated strand: Single wire epoxy coating before twisting or integral coating after twisting.
Unbonded strand: Pre-filled with anti-rust grease and extruded HDPE sheath, cut into fixed lengths on request.
Custom processing: Fixed-length cutting, marking, special reel weight packaging as required.
8. Quality Inspection Standards
Dimensional inspection: Full inspection of nominal diameter, twist pitch, coil weight and coil length.
Mechanical performance test: Breaking load, yield load, elongation, 1000-hour relaxation test.
Surface inspection: Check loose wires, broken wires, coating defects and grease filling status.
Galvanized / epoxy coating test: Coating thickness, adhesion, salt spray anti-corrosion test for anti-corrosion strands.
Batch marking: Each reel labeled with grade, diameter, tensile strength, coil weight, heat number in Chinese and English. English MTC issued per batch, third-party re-inspection supported.
9. Packaging & Ocean Shipment
Reel packaging: Wound on solid steel reels, wrapped with inner VCI anti-rust film and outer waterproof plastic film, fastened by steel straps. Wooden pallets available for container loading.
Anti-rust protection: Full anti-rust grease on plain strands to resist long-distance marine dampness and oxidation.
Labeling: Bilingual labels attached to each reel indicating product type, diameter, tensile grade, net weight and heat number.
Loading Port: Spot goods loaded within 3 working days, customized anti-corrosion strands containerized within 5–7 days.
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