9.53MM Galvanized PC Steel Strand

1. Basic Concepts

9.53 galvanized Prestressed Steel strand is a steel product made of multiple high-strength steel wires, where "9.53" usually refers to the nominal diameter of the steel strand of 9.53mm. Its outer layer is hot-dip galvanized to enhance corrosion resistance, and is a commonly used load-bearing member in prestressed concrete structures.

2. Structure and Material

Structural Composition

Usually made of 7 high-strength steel wires, 1 steel wire in the center and 6 steel wires on the periphery are spirally wound to form a stable twisted structure.

For steel strands with a nominal diameter of 9.53mm, its cross-sectional area, breaking tension and other parameters must comply with relevant national standards (such as GB/T 5224).

Material Characteristics

Steel wire material: high carbon steel (such as 82B, 72A, etc.), cold drawn and tempered, high strength (tensile strength is usually ≥1860MPa) and good toughness.

Galvanized layer: formed by hot-dip galvanizing process, the thickness of the zinc layer is generally ≥35μm (adjustable according to the use environment), which plays an electrochemical protection role to prevent steel from rusting.

3. Main performance indicators

Item Typical parameters Standard requirements

Nominal diameter 9.53mm Allowable deviation ±0.15mm

Cross-sectional area Approximately 54.8mm² ——

Tensile strength ≥1860MPa GB/T 5224 stipulates ≥1860MPa

Breaking tensile force ≥102kN (adjusted according to the strength grade) ——

Galvanized layer adhesion Copper sulfate test ≥4 times without red rust GB/T 2972 ​​standard

Relaxation rate 1000 hours relaxation rate ≤2.5% (20℃, initial stress 70% nominal tensile strength) GB/T 5224 requires ≤3.5%

4. Production process

Steel wire preparation: High carbon steel billet is hot rolled and cold drawn into steel wire of specified diameter, and then tempered to eliminate internal stress and improve toughness.

Twisting: 7 steel wires are twisted at a specific twisting distance on a stranding machine to form a steel strand.

Galvanizing: Through the hot-dip galvanizing process, a uniform zinc layer is formed on the surface of the steel strand to enhance the anti-corrosion performance.

Relaxation: The finished steel strand undergoes a tension stress relaxation test to ensure stable performance under long-term load.

9.53 Practical application of galvanized prestressed steel strand

I. Construction engineering field

Prestressed concrete structure

Bridge engineering: used for prestressing of simply supported beams, continuous beams, cable-stayed bridges, etc., such as the reinforcement of the main beams of highway bridges and railway bridges.

High-rise buildings: used for prestressed construction of large-span floor slabs, roofs, and walls to reduce concrete cracks and improve the bearing capacity of the structure.

Pipe piles and poles: used as the main force in precast concrete pipe piles and poles to enhance crack resistance and durability.

Geotechnical anchoring engineering

Slope support: The slope soil is fixed by anchor cables (made of steel strands) to prevent landslides, which is common in water conservancy projects, mining and road construction.

Tunnel support: used as anchor rods in tunnel excavation to reinforce surrounding rock and ensure construction safety.

2. Water conservancy and hydropower engineering

Dam and sluice: used for prestressed reinforcement of dam bodies and gate piers to improve structural impermeability and crack resistance.

Water pipeline: steel strands are used as prestressed tendons in prestressed concrete water pipes (PCCP) to withstand internal water pressure.

3. Traffic engineering

Highway guardrails: steel strands are used as tensile members in some high-strength guardrail structures to improve collision resistance.

Railway sleepers: steel strands are embedded in prestressed concrete sleepers to enhance the bending resistance of sleepers.

4. Other fields

Marine engineering: such as prestressed components of offshore wind power foundations and port terminals, using galvanized layers to resist seawater corrosion.

Agriculture and fisheries: used for the reinforcement of greenhouse frames and aquaculture cages to withstand wind and snow loads.

Application advantages and precautions

1. Advantages

High strength and high durability: high tensile strength, galvanized layer can extend service life, suitable for harsh environments (such as moisture and salt spray).

Convenient construction: The length can be customized according to the design requirements, the tensioning process is mature, and the construction efficiency is high.

Economical: Compared with ordinary steel bars, it reduces the amount of concrete, reduces the deadweight of the structure, and has obvious comprehensive cost advantages.

2. Precautions

Storage and transportation: Avoid humid environments, raise the bottom during storage, and cover with waterproof cloth to prevent damage to the galvanized layer.

Construction specifications: The stress value must be controlled during the tensioning process to avoid over-tensioning and breakage; the anchor end must be treated with anti-corrosion (such as applying butter and wrapping sheaths).

Environmental adaptability: In highly corrosive environments (such as industrial wastewater and strong acid soil), additional anti-corrosion measures (such as epoxy coating) are required.

Summary

9.53 Galvanized prestressed steel strands have become the core material of prestressed structures in the fields of construction, water conservancy, and transportation due to their high strength and corrosion resistance. Its application not only improves the safety and durability of engineering structures, but also promotes the technical development of large-span and complex structures. In actual use, it is necessary to strictly control the material, construction process and anti-corrosion measures in combination with engineering requirements to give full play to its performance advantages.9.53MM Galvanized PC Steel Strand.