PC Strands

Description

1. Product Overview
PC Strands (Prestressed Concrete Strands) are high-tensile, seven-wire steel strands manufactured from cold-drawn, stress-relieved, or low-relaxation wire, conforming to ASTM A416, BS 5896, and EN 10138 standards. They are the critical reinforcement component in prestressed concrete structures—bridges, high-rise buildings, wind turbine towers, and heavy-load slabs. The key value proposition is superior tensile strength (up to 1,860–2,000 MPa) combined with minimal relaxation loss (<2.5% at 1,000 hours), enabling longer spans, thinner structural elements, and reduced material usage. As global infrastructure investment rises, PC Strands are strategically indispensable for cost-efficient, high-durability concrete construction.

2. Key Specifications & Technical Characteristics

• Material composition: High-carbon steel (0.72–0.85% C, 0.60–0.90% Mn, 0.10–0.30% Si, ≤0.025% P, ≤0.025% S)

• Grade / relaxation class: Low relaxation (Grade 270 / LR) or stress-relieved (Grade 250 / SR)

• Physical characteristics:

  • 7-wire configuration (1 center wire + 6 outer wires)

  • Diameters: 9.3 mm, 11.1 mm, 12.7 mm, 15.2 mm, 15.7 mm (0.5″ to 0.6″)

  • Color: Metallic bright or slight surface oxide (no rust)

  • Linear density: 525 g/m (for 12.7 mm) up to 1,102 g/m (for 15.7 mm)

• Mechanical properties (typical – 12.7 mm low relaxation):

  • Tensile strength: 1,860 MPa min

  • Yield strength (0.2% offset): 1,650 MPa min

  • Elongation (≥500 mm gauge): 3.5% min

  • Relaxation (1,000 h, 70% breaking load): ≤2.5%

• Packaging options:

  • Precision-wound coils: 1.5 to 4.0 MT per coil

  • Nylon strapping + waterproof kraft paper + wooden pallets

  • Plastic spools / reels available for specialty pay-off

• Shelf life: 24 months in original, dry, covered storage (RH ≤60%, temp 5–40°C)

3. Core Industrial Applications

• Bridges & viaducts: Pre-tensioned and post-tensioned girders, box beams, and segmental bridges. PC Strands enable longer spans (up to 50m without intermediate supports) vs. conventional rebar, reducing pier costs by 25–35%.

• High-rise & commercial buildings: Core walls, transfer slabs, and podium slabs. Strands reduce floor-to-floor height by 15–20 cm, adding extra rentable floors for the same building height.

• Wind energy towers: Prestressed concrete towers for multi-MW turbines. PC Strands’ low relaxation ensures long-term tower integrity under cyclic loading—critical for 20+ year asset life.

• Heavy-duty pavements & containment: Airport runways, nuclear containment vessels, LNG storage tanks. Strands provide crack control and post-cracking ductility unmatched by welded wire fabric.

Why better than alternatives: Higher strength/weight ratio than rebar; lower relaxation than stress-relieved wire; consistent elongation ensures predictable structural behavior under seismic loads.

4. Competitive Advantages

• Quality consistency: ISO 9001:2015 certified production with in-line eddy current testing + tensile verification per heat (3σ process control; Cpk ≥1.33).

• Supply reliability: Multiple integrated mills (annual capacity 350,000+ MT) with buffer stock in regional hubs (Rotterdam, Houston, Shanghai, Jebel Ali).

• Logistics capability: Bulk vessel loading up to 25,000 MT per shipment; containerized LCL/FCL for mixed orders.

• Price competitiveness: Direct mill pricing with no trader markup; hedge book for raw material wire rod reduces price volatility.

• Sustainability: Low-carbon manufacturing (electric arc furnace route + 85% recycled scrap input); EPD available upon request.

• Technical support: Licensed PE-stamped shop drawings + relaxation prediction software (free for qualified buyers).

5. Commercial & Supply Information

• Minimum Order Quantity (MOQ): BULK 20 MT per diameter / relaxation type

• Loading capacity (per 20ft container):

  • 20 MT (standard – coils up to 1.9m diameter)

  • 24 MT (max – tight coils + reinforced floor container)

• Loading capacity (per 40ft HC container): 26–28 MT depending on coil dimensions

• Delivery terms: FOB, CFR, CIF, EXW (mill side)

• Lead time: 21 days for BULK MOQ; 45 days for custom diameters / special packaging