EN10138 Standard Low Relaxation Prestressed Steel Strand – High-Strength, Durable, and Versatile for Global Construction Projects
Engineered to meet the rigorous demands of modern infrastructure, EN10138 standard low relaxation prestressed steel strand is a premium-grade material designed for long-term performance in high-stress environments. This advanced steel product combines exceptional tensile strength with minimal stress loss over time—making it an ideal choice for bridges, skyscrapers, dams, and geotechnical applications worldwide. Manufactured under strict compliance with European standards, this strand ensures consistent quality, safety, and structural integrity across diverse global markets.
Key Features:
- Complies with EN10138 specifications for low relaxation behavior
- Available in multiple diameters (9.53mm to 15.24mm) for tailored engineering solutions
- High tensile strength up to 1860 MPa with elastic modulus of 190 kN/mm²
- Stress relaxation rate ≤ 2.5% after 1000 hours at 70% initial stress
- Manufactured from high-carbon wire rods like SWRH77B/SWRH82B
- Advanced cold drawing and stranding processes enhance durability
- Options include galvanized, weather-resistant, and unbonded variants
Detailed Description:
Each strand consists of seven individual wires twisted together using precision machinery, resulting in a robust, flexible, and highly efficient reinforcement system. The manufacturing process includes surface treatment, cold working, and heat stabilization to ensure optimal mechanical properties and long-term stability under load. Unlike conventional steel strands, EN10138-compliant products exhibit significantly reduced relaxation—meaning they maintain tension over decades, which is critical for structures subjected to dynamic forces such as wind, seismic activity, or live loads. This makes them particularly suitable for large-span structures where dimensional stability and crack control are paramount.
These prestressing elements are not only strong but also adaptable—they can be integrated into post-tensioned concrete systems, precast beams, anchor cables, and more. Their ability to transfer high levels of force without significant deformation allows engineers to reduce cross-sectional sizes, lower dead weight, and optimize space utilization in buildings, bridges, and industrial facilities. Additionally, corrosion-resistant coatings and specialized treatments make them ideal for harsh environmental conditions—from coastal regions to mountainous terrain.
Applications Across Industries:
In bridge construction, these strands serve as critical components in cable-stayed and suspension systems, enhancing load distribution and extending service life. For high-rise buildings, they improve floor and roof slab performance while reducing material usage and improving seismic resilience. In hydropower and dam projects, their resistance to water pressure and cracking ensures watertight integrity and structural longevity. In civil and geotechnical engineering, they function as anchor rods or soil nails for slope stabilization, landslide mitigation, and foundation anchoring—offering reliable support even in unstable ground conditions. They're also widely used in stadiums, airports, warehouses, and retrofitting existing structures where strength-to-weight ratio and durability are essential.
User Feedback Highlights:
Global contractors and engineers consistently praise the reliability of EN10138 low relaxation strands. Many report improved project timelines due to easier installation, fewer maintenance issues, and enhanced confidence in long-term performance. Architects appreciate how the use of these materials enables innovative designs with thinner slabs and larger spans, contributing to both aesthetic appeal and functional efficiency. Civil engineers highlight the consistency in mechanical behavior across batches—a crucial factor when managing large-scale infrastructure projects spanning multiple countries and climates.
Frequently Asked Questions:
What does "low relaxation" mean in steel strands? It refers to the material’s ability to retain its initial tension over extended periods, minimizing loss of prestress—vital for maintaining structural performance over decades.
How do I choose between different diameters? Diameter selection depends on design requirements: smaller sizes (e.g., 9.53mm) suit lighter-duty applications, while larger ones (like 15.24mm) offer greater load capacity for heavy infrastructure like bridges or tall buildings.
Are these strands suitable for corrosive environments? Yes—galvanized and weather-resistant versions provide excellent protection against moisture, salt, and chemical exposure, making them ideal for marine, industrial, or polluted areas.
Why is EN10138 important for international projects? Because it sets a benchmark for performance, consistency, and safety that aligns with EU regulations and is increasingly adopted globally as a trusted standard for prestressed concrete technology.
With over 30 years of experience, Chunpeng Group delivers cutting-edge PC steel materials engineered for tomorrow’s infrastructure needs—combining innovation, quality, and sustainability in every strand.
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