Prestressed Concrete Rebar Coil

Coiled rebar, commonly known as wire rod or coiled bar, is a type of deformed steel bar that is hot-rolled and supplied coiled. Its defining feature is the "coiled" form, with relatively small nominal diameters (e.g., φ6mm-φ12mm), which provides exceptional flexibility in storage, transportation, and construction.

The core value of coiled rebar lies in its superior convenience and cost-effectiveness. Unlike straight rebar, it does not require fixed-length cutting or extensive welding. It can be straightened for use or cut on-site as needed, significantly reducing material waste and processing steps, thereby enhancing construction efficiency.

In terms of performance, coiled rebar retains the inherent advantages of standard rebar, such as high strength and excellent bond with concrete. The key to its production process is "high-speed wire rod rolling" and "controlled cooling." The Stelmor controlled cooling process applied to the coils after rolling precisely optimizes the metallurgical structure, ensuring consistent mechanical properties and uniformity.

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Product Details

Common Models/Grades：

Diameter: φ6mm-φ12mm Grade: HRB400, HRB400E, HRB500, HRB500E

Characteristics：

● High Construction Efficiency: Eliminates the need for multiple welds and splices required by straight rebar. It can be straightened and cut on-demand, significantly speeding up construction.
● Very Low Waste: Minimal off-cut loss, with material utilization rate close to 100%, offering significant cost-effectiveness.
● Convenient Storage & Transport: The coiled form saves space, facilitating loading/unloading and storage on sites with limited area.
● Excellent Performance: Produced using high-speed wire rod mills and Stelmor controlled cooling lines, resulting in a uniform metallurgical structure and stable mechanical properties.

Standards：

The primary standards in China are GB/T 1499.1-2017 "Steel for the reinforcement of concrete—Part 1: Hot-rolled plain bars" and GB/T 1499.2-2018 "Steel for the reinforcement of concrete—Part 2: Hot-rolled ribbed bars". These standards specify technical requirements for dimensions, weight tolerances, mechanical properties (e.g., yield strength, tensile strength, elongation), etc.

Main Applications：

● Stirrups/Ties: Used in beams and columns to resist shear forces.
● Distribution Bars: Used in slabs and walls to secure the position of main reinforcement and distribute loads.
● Detailing Reinforcement: Bars configured to meet structural detailing requirements.

Packaging：

It is typically bundled for packaging. The coils are first securely bound with iron wire or steel straps to prevent deformation during transit. Multiple coils are then combined into a larger bundle for convenient hoisting and storage. A tag is attached, indicating product specifications, grade, manufacturer, weight, and other relevant information.

apptions

FAQ

Q: What do the letters and numbers on a rebar mean?

A: These are grade marks. For example, a rebar marked "4E HT 10": The "4" indicates the strength grade (HRB400), the "E" signifies that it is a seismic (earthquake-resistant) rebar, "HT" might be the manufacturer's code, and "10" is the nominal diameter of 10mm.
Q: Why are there different rib patterns, like crescent rib and spiral rib?

A: This refers to the shape of the transverse ribs. The crescent rib is a common pattern that provides strong grip with concrete. Spiral ribs offer superior anchorage but are slightly more expensive to produce. Different national standards specify different rib patterns.
Q: Can rebar be welded?

A: Yes, but with special caution. Rebars with higher carbon equivalent (like HRB500) have poorer weldability and require techniques like preheating and specific electrodes. Seismic-grade rebars (with "E") generally have better weldability.
Q: How to calculate the weight of a rebar?

A: The most common formula is: Weight (kg) = Diameter (mm) × Diameter (mm) × Length (m) × 0.00617. For example, the weight of a 12mm diameter, 9m long rebar is approximately: 12 × 12 × 9 × 0.00617 ≈ 7.996 kg.
Q: What is the difference between deformed rebar (threaded bar) and plain round bar?

A: The key difference lies in the surface and bonding performance. Deformed rebar has ribs, which provide a much stronger bond with concrete compared to the smooth surface of a plain round bar. Thus, deformed bars are universally used in main load-bearing structures, while plain bars are often used for stirrups, distribution bars, etc.
Q: Why does rebar rust? Does rust affect its usability?

A: Rebar is steel and will naturally oxidize and rust when exposed to air. Light surface rust generally has little negative impact on the bond with concrete and can sometimes even be beneficial. However, heavy, flaky rust can weaken the bond and should be removed by mechanical means before use.
Q: What is "seismic rebar"?

A: Seismic rebar (identified by a grade with "E", e.g., HRB400E) has better ductility (ability to deform without breaking) and a higher uniform elongation. During an earthquake, it can absorb more energy, delaying the collapse of a structure and improving safety.

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Prestressed Concrete Rebar Coil

Product Details

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