For engineers, contractors, and precast concrete manufacturers, selecting the right reinforcement material directly affects structural safety, durability, and long-term performance. Prestressed Concrete Steel Wires supplied by Luguan is engineered to deliver consistent mechanical properties, excellent bond behavior, and reliable relaxation characteristics across large production runs.
Luguan manufactures prestressed concrete steel wire using high-carbon steel wire rods sourced from approved mills. The wire is cold-drawn through precision dies, then stress-relieved or stabilized to achieve low relaxation performance. Each coil is tested for tensile strength, yield strength, elongation, and relaxation before shipment.
| Coil Type | Inner Diameter (mm) | Outer Diameter (mm) | Coil Weight Range (kg) | Packaging Materials |
|---|---|---|---|---|
| Small coil | 800 | 1,200 | 500 – 1,000 | Plastic film, steel straps |
| Standard coil | 1,000 | 1,400 | 1,000 – 2,000 | Anti-rust oil, waterproof paper, steel frame |
| Large coil | 1,200 | 1,600 | 2,000 – 2,500 | Pallets or coil carriers for container loading |
Each coil carries a durable tag with the heat number, diameter, strength grade, coil weight, standard reference, and production date. This traceability supports quality audits and site acceptance testing.
Prestressed concrete steel wires is used in a wide range of structural concrete products. The high tensile strength of the wire allows engineers to apply compressive forces to concrete before service loads are introduced. This compressive stress counteracts tensile stresses caused by dead loads, live loads, and temperature effects. The main application areas include:
Q: What is prestressed concrete steel wire used for?
A: It is used to apply compressive stress to concrete structures before they carry service loads. This improves crack resistance, increases load-bearing capacity, and allows longer spans. Typical applications include bridge girders, railway sleepers, hollow core slabs, concrete pipes, piles, poles, and precast building elements. The wire is tensioned either before concrete casting in pretensioning or after casting in post-tensioning.
Q: What standards does Luguan steel wire comply with?
A: It is produced to meet a wide range of international and regional standards. The most common standards include ASTM A421 for uncoated stress-relieved wire, ASTM A416 for low-relaxation wire and strand, BS 5896 for high tensile steel wire and strand, ISO 6934 for prestressing steel, GB/T 5223 for prestressed concrete steel wires, and EN 10138 for prestressing steels. Custom manufacturing to project-specific standards is available after technical review.
Q: What is the difference between low relaxation and stress-relieved wire?
A: Stress-relieved wire undergoes a heat treatment that reduces residual stresses from drawing, but it still exhibits noticeable relaxation under sustained load. Low relaxation wire receives an additional stabilization treatment under tension and controlled temperature. This treatment significantly reduces long-term relaxation losses. For low relaxation wire, the maximum relaxation loss is generally 2.5% after 1,000 hours, while stress-relieved wire may lose 6% or more under the same initial load. Luguan standard production is low relaxation wire because it provides better long-term performance and lower prestress loss.
Q: What is the typical delivery lead time for bulk orders of Luguan steel wire?
A: For standard diameters and strength grades, Luguan typically ships within 15 to 25 days after receiving a confirmed order and deposit or letter of credit. Custom diameters, special surface profiles, or non-standard coil weights may require 25 to 40 days. Lead time also depends on order volume and container availability. The sales team provides a firm schedule after order confirmation and keeps buyers updated on production status.
Q: How do I choose between plain, indented, and spiral ribbed wire?
A: The choice depends on the prestressing system and bond requirements. Plain round wire is suitable for unbonded post-tensioning where the wire is covered with grease and a plastic sheath. Indented wire provides better mechanical bond in pretensioned members and reduces transfer length. Spiral ribbed wire offers the highest bond performance and is preferred for hollow core slabs, railway sleepers, and other precast elements where early strength development is critical. Luguan engineers can help evaluate bond stress and transfer length based on project specifications.
Q: What coil weights and packaging options does Luguan offer?
A: Luguan offers coil weights from 500 kg to 2,500 kg depending on wire diameter and shipping method. Standard packaging includes anti-rust oil coating, waterproof paper, and steel strapping. Coils can be supplied on wooden pallets, steel frames, or coil carriers for container loading. For export shipments, Luguan uses desiccant bags and VCI film to prevent condensation corrosion during ocean transport. Custom packaging labels and barcodes are available for large projects.
Q: What information is needed to request a quotation?
A: To receive an accurate quotation from Luguan, please provide the following information: wire diameter, tensile strength grade, surface type, applicable standard, coil weight preference, total quantity, destination port, and required delivery date. If the wire is for a specific project, sharing the relevant section of the structural drawings or prestressing calculations helps the technical team confirm the correct product and offer suitable alternatives if needed.
