Luguan Low Relaxation Prestressed Concrete Steel Wire is developed for applications where maintaining stable prestressing force over a long period is critical. Through controlled steel composition, precision cold drawing, and stress-relieving treatment, the wire achieves lower relaxation performance and more reliable long-term structural support.
The main purpose of low relaxation steel wire is not simply achieving high strength. Its key role is to reduce the gradual release of internal stress when the wire remains under tension for a long time.
During the service life of a prestressed concrete component, the steel wire continuously carries tensile force. A wire with higher relaxation characteristics may experience greater stress reduction, which can weaken the effectiveness of prestressing.
Low relaxation prestressed concrete steel wire controls this process through:
● Optimized high-carbon steel composition
● Controlled cold drawing deformation
● Stress-relieving stabilization treatment
These processes help reduce internal residual stress and improve the stability of the wire structure after tensioning.
As a result, concrete components can maintain more consistent prestressing performance throughout long-term operation.
For infrastructure projects, the difference between prestressed steel wire types is often reflected in long-term performance rather than initial strength alone.
|
Item |
Conventional Prestressed Steel Wire |
Low Relaxation Prestressed Steel Wire |
|
Stress Loss Over Time |
Higher tendency under long-term loading |
Reduced and controlled |
|
Prestress Retention |
More affected by relaxation |
More stable during service |
|
Long-Term Structural Performance |
Depends more on maintenance conditions |
Better suited for long-life structures |
|
Typical Applications |
General prestressed components |
Bridges, railway systems, pressure pipes, major infrastructure |
For projects requiring decades of service, low relaxation performance becomes an important selection factor.
Stress relaxation is one of the most important indicators for prestressed steel wire.
Luguan low relaxation grade wire achieves a 1000-hour stress relaxation rate of ≤2.5%, helping reduce the loss of initial prestressing force after concrete components enter service.
Different structural designs require different strength levels.
Common tensile strength grades include:
● 1570MPa
● 1670MPa
● 1860MPa
The suitable grade depends on component design, loading conditions, and manufacturing requirements.
Stable elastic behavior supports accurate tension control during prestressing operations.
Consistent elongation performance helps precast manufacturers achieve better production repeatability.
Although prestressed steel wire is designed for high strength, sufficient ductility remains important during production, handling, and service.
The balanced mechanical properties of Luguan wire support applications exposed to repeated loading, such as railway and bridge structures.
The performance of low relaxation steel wire begins with raw material selection and continues throughout manufacturing.
Luguan uses high-carbon steel wire rod materials such as SWRH82B and 82MnA, which provide suitable composition and metallurgical characteristics for prestressed applications.
The production process includes:
High Carbon Steel Wire Rod Selection
↓
Surface Preparation
↓
Multi-Pass Cold Drawing
↓
Stress-Relieving Tempering
↓
Surface Forming (According to Requirement)
↓
Finished Product Testing
Cold drawing increases tensile strength and improves dimensional accuracy, while stress-relieving treatment reduces internal stress generated during deformation.
The combination of these processes allows the finished wire to achieve stable mechanical performance and controlled relaxation characteristics.
Low relaxation prestressed concrete steel wire can be supplied in several surface forms according to application requirements.
Suitable for conventional prestressed concrete systems where standard bonding conditions are sufficient.
Main features:
● Uniform surface
● Stable processing performance
● Wide application compatibility
Designed for applications requiring stronger interaction between steel wire and concrete.
The continuous spiral ribs improve mechanical engagement and help transfer prestressing force more effectively.
Common uses include:
● PHC pipe piles
● Concrete poles
● Precast components
The indented profile increases surface contact with concrete and improves anchorage performance for specific structural requirements.
Railway components are subjected to continuous vibration and repeated loading.
Low relaxation steel wire helps maintain prestressing efficiency, supporting long-term crack resistance and structural stability.
Foundation piles carry continuous loads after installation.
Stable prestress retention helps PHC piles maintain reliable mechanical performance throughout their service period.
Prestressed concrete cylinder pipes operate under constant internal pressure.
Low relaxation characteristics help reinforcement systems maintain their effectiveness and support long-term durability.
Bridge beams, slabs, and other precast elements require reinforcement materials with predictable long-term behavior.
Low relaxation prestressed concrete steel wire provides stable performance for demanding infrastructure applications.
Large-scale precast construction requires consistent material quality and efficient production.
Luguan wire supports manufacturers producing floor slabs, wall panels, and other concrete components with stable reinforcement performance.
|
Item |
Specification |
|
Product Name |
Low Relaxation Prestressed Concrete Steel Wire |
|
Brand |
Luguan |
|
Material |
SWRH82B / 82MnA High Carbon Steel |
|
Diameter Range |
Φ4.0mm–Φ8.0mm |
|
Tensile Strength Grade |
1570MPa / 1670MPa / 1860MPa |
|
Relaxation Performance |
≤2.5% (1000h) |
|
Surface Type |
Smooth / Spiral Ribbed / Indented |
|
Standard |
GB/T 5223 Steel Wires for Prestressed Concrete |
|
Supply Form |
Coil |
Customized specifications, packaging methods, and technical documents are available according to project requirements.
For infrastructure projects, product consistency between different batches is essential.
Luguan controls key production stages to ensure stable quality, including:
Checking chemical composition and material condition before production.
Maintaining accurate diameter and mechanical properties during cold drawing.
Evaluating long-term stress loss characteristics.
Confirming:
● Tensile strength
● Elongation
● Surface condition
● Dimensional accuracy
● Packaging quality
Mill Test Certificates and inspection documents can be provided for customer verification.
Luguan Xingsheng New Material Technology specializes in steel wire manufacturing and processing, focusing on stable supply for construction, infrastructure, and industrial applications.
The company produces:
● 45#–70# carbon steel wire
● 65Mn spring steel wire
● Mattress steel wire
● 77B–82B prestressed steel wire
● 30MnSi screen mesh steel wire
● Q195 and Q235 cold-drawn wire
With dedicated experience in steel wire production, Luguan provides customized specifications, technical support, and reliable supply solutions for global customers.
Prestressed concrete structures depend on maintaining internal tensile force over long periods. Low relaxation steel wire helps reduce stress loss and maintain structural performance.
Prestress loss may result from steel relaxation, concrete shrinkage, creep, temperature changes, and long-term loading conditions.
The low relaxation grade can achieve a 1000-hour stress relaxation rate of ≤2.5% according to technical requirements.
Common raw materials include SWRH82B and 82MnA high-carbon steel wire rod.
It is commonly used in railway sleepers, PHC piles, PCCP pipes, bridge components, concrete poles, and other prestressed concrete structures.
Yes. Luguan can provide technical documents including material certificates, mechanical test reports, and related quality records according to customer requirements.
Address
Hongyun Economic & Technological Development Zone, Qingyun Hongyun Economic Development Zone, Qingyun County, Dezhou City, Shandong Province, China
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