IS 16644: 2018
Steel and Iron - Stress-Relieved, Low Relaxation Steel Wire for Pre-stressed Concrete
Summry
Stress-relieved, low relaxation steel wire is a high-strength steel wire specially treated to reduce internal stresses and minimize loss of tension over time. It is used in pre-stressed concrete structures such as bridges, sleepers, and buildings to improve load-bearing capacity and durability.
Why BIS Certificate is Mandatory for Stress-Relieved, Low Relaxation Steel Wire for Pre-stressed Concrete ?
BIS certification is mandatory to ensure that stress-relieved, low relaxation steel wire meets Indian safety and performance standards. These wires are critical structural materials, and BIS certification guarantees controlled strength, relaxation properties, and reliability, preventing structural failure and ensuring long-term safety in pre-stressed concrete applications.
What is BIS Certified for Stress-Relieved, Low Relaxation Steel Wire for Pre-stressed Concrete ?
The BIS certified specification (such as IS 1785 or IS 6006, as applicable) defines requirements for chemical composition, tensile strength, elongation, relaxation limits, diameter tolerance, surface condition, and testing methods. Compliance ensures the steel wire performs consistently under sustained loads in pre-stressed concrete structures.
Test required for Stock for Stress-Relieved, Low Relaxation Steel Wire for Pre-stressed Concrete
| Title | Mandatory/Optional |
|---|---|
| Chemical composition – Steel/ Steel Wire Rod | Optional |
| Manufacture | Required |
| Nominal diameters, Nominal cross sectional area, Nominal mass, Permissible tolerances and ovality | Required |
| Surface configuration | Required |
| Straightness | Required |
Mechanical Properties
| Title | Mandatory/Optional |
|---|---|
| Tensile strength | Required |
| Proof stress | Required |
| Bending ductility | Required |
| Elongation at Maximum force | Required |
| Relaxation | Optional |
| Fatigue | -- |
Benefits of BIS Certification for Stress-Relieved, Low Relaxation Steel Wire for Pre-stressed Concrete
-
Structural Safety Assurance
BIS certification ensures the steel wire meets strict strength and relaxation limits, reducing the risk of failure in bridges, buildings, and infrastructure projects. -
Consistent Performance
Certified wires offer uniform mechanical properties, ensuring predictable behavior under long-term loads and improving the reliability of pre-stressed concrete systems. -
Long-Term Durability
BIS-approved steel wires resist stress loss, corrosion effects, and fatigue, increasing the service life of concrete structures. -
Legal Compliance in India
BIS certification is mandatory for manufacturing and importing, allowing lawful sale and use in government and private construction projects. -
Market Trust and Acceptance
The BIS mark enhances confidence among engineers, contractors, and project authorities, improving brand value and acceptance in large-scale infrastructure developments.