A Brief Introduction to PC Strand

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Jan 12, 2023

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PC Strand, the prestressed concrete steel strand, is a twisted steel cable composed of 2, 3, 7, or 19 high-strength steel wires. It is stress-relieved (stabilized) for prestressed concrete or similar purposes. PC Strand is mainly used for concrete structures, such as railway and highway construction, overhead cranes, multi-floor industrial buildings, and so forth. These products have been widely applied in large-scale engineering constructions, including railroads, highways, and bridges.

Classification

According to the number of steel wires in a strand, PC Strand is classified into 2-wire strand, 3-wire strand, 7-wire strand, and 19-wire strand.

Based on surface morphology, it can be divided into smooth steel strand, scoring strand, mold-pulling strand (compact), and coated epoxy resin steel strand.

According to surface shapes, stranded wire types include smooth plain steel strand, indented steel strand, helix strand, compact steel strand, and epoxy-coated PC Strand (7 wires individually coated).

It can also be categorized by wire diameter, intensity level, or standard.

Common sizes include diameters of 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, and 9mm indented PC wire for metal building materials.

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Wire Shapes: Plain wire, Spiral ribbed steel wire

Standard: GB/T5223, ASTM A421, BS5896, JIS G3536, ISO6934, EN10138

Coil weight: 1–3 tons

Elongation: 3.5%

Tensile Strength: 1470 MPa-1860 MPa

Function: Low relaxation PC wire is used for prestressed steel structures, prestressed and post-tensioning, in large, medium, and small sizes.

Specification

In the description and list of the table, we often see specifications like 15–7φ5, 12–7φ5, and 9–7φ5 of the prestressed steel strand.

For example, in 15–7φ5, 5 indicates a single steel diameter of 5.0mm. 7φ5 indicates seven steel wires forming a strand, and 15 indicates the diameter of each strand is 15mm. In total, a beam consists of 7 strands of diameter 15 mm (each having a total diameter of about 15.24 mm, with a dimensional deviation of +0.40 -0.20; the diameter per filament is approximately 5.0 mm).

The general sectional area is calculated according to 140mm^2. The theoretical breaking value is 140 * 1860 = 260.4 kN. According to the prestressing standard of 60%-65%, it can withstand a tension of 156.24–169.26 kN.

Material

Using high-carbon steel wire rod, after surface treatment of cold drawn into steel wire, and then by the strand structure will be a number of steel wires stranded into shares, and then through the elimination of stress from the stabilization process.

To extend durability, the wire can have metal or non-metallic coatings, such as galvanized or epoxy resin coatings. To increase the bond strength with concrete, the surface can have nicks and other features.

The prestressed strands of the mold are twisted to form a mold compression process. This makes the structure more compact and the surface layer more suitable for anchoring.

The production of unbonded prestressed steel strand (unbonded steel strand) involves using ordinary prestressed steel wire, coated with oil or paraffin, and then wrapped in high-density polyethylene (HDPE).

Feature

The main characteristics of prestressed steel strand are high strength and good relaxation performance. Additionally, it maintains straightness. Common tensile strength levels include 1860 MPa, along with 1720, 1770, 1960, 2000, 2100 MPa, and similar intensity levels. The yield strength of this steel is also higher.

About Huayongxin PC Strand

Founded in 2004, Tianjin Huayongxin Prestressed Steel Wire Co., Ltd. is located in Tianjin. Our company is dedicated to providing a full range of seven- and three-wire low-relaxation prestressed concrete strands for post-tensioning and mining applications.

Kindly tell us what you are looking for, and we will provide you with the best price as soon as possible. We will also send you our catalog, certificates, and samples.

We hope to cooperate with you as a supplier offering competitive prices and high-quality products.

PC Strand - 2&3 wires

Established in 1963, Siderurgica Latina Martin focuses on manufacturing PC Strand (2 & 3 wires) in accordance with the most recognized international standards.
Siderurgica Latina Martin turns High Carbon Wire Rod into PC Strand (2 & 3 wires) through an integrated manufacturing process starting from in-house Acid Pickling & Pre-Coating, Cold Wire Drawing, Stranding, Thermo-Mechanical Process to Rewinding & Packaging.

2 & 3 Wire Strand consists of a group of 2 & 3 high tensile strength cold drawn wires spun together in helical form over a theoretical common axis in one layer with uniform pitch.
2 & 3 Wire Strand is widely used in precast concrete elements and concrete poles.
Additional configurations of 2 & 3 wire PC Strand can be produced on demand.

Diameter Range: 2-wires: 4.50 mm | 3-wires: 4.85 mm to 8.60 mm
Tensile Strength Range: 1770 Mpa to 2160 Mpa
Coil Weight: 190 kg to 3,000 kg

Contact us to discuss your requirements of PC Wire manufacturers. Our experienced sales team can help you identify the options that best suit your needs.