Steel fiber types and performance analysis
Jun 11, 2025| Faced with a wide range of steel fiber products on the market, how should we choose? Don't worry, next, we will analyze them one by one from multiple dimensions such as classification, performance, and application adaptation to help you find steel fiber products that truly meet the needs of the project.
1. Detailed explanation of the classification of steel fibers
According to the national standard "Steel Fiber for Concrete" (GB/T 8109), the classification of steel fibers mainly starts from the following aspects:
1. Raw material type
Steel fibers can be divided into the following categories according to the steel used:
Carbon structural steel fiber: high strength, good cost performance, is the most common general-purpose steel fiber.
Alloy structural steel fiber: has better wear resistance and toughness, suitable for projects with high structural load requirements.
Stainless steel fiber: excellent corrosion resistance, suitable for marine engineering, high humidity environment or projects with special requirements for durability.
Other steel fibers: such as heat-resistant steel and acid-resistant steel, usually used for special industrial purposes.
2. Classification of manufacturing process
The performance of steel fiber is closely related to the production process. The main processes include:
Wire cold drawing type: good dimensional consistency, high strength, widely used in high-performance concrete.
Steel plate shearing type: low cost, suitable for general industrial floor and pavement engineering.
Steel ingot milling type/wire scraping type: complex process, rough fiber surface, conducive to enhancing bonding with concrete.
Melt drawing type: fine and uniform fiber, mostly used in ultra-high performance concrete (UHPC).
3. Shape and surface characteristics
Steel fiber bears the role of tensile crack resistance and force transmission in concrete, so the shape design is crucial:
Straight type: simple structure, suitable for basic reinforcement needs.
Special-shaped fiber: such as end hook type, corrugated type, spiral type, etc., can significantly improve the anchoring force between fiber and concrete, enhance the structural integrity and crack resistance.
4. Forming method
Bonded row type: easy to feed and disperse, often used in industrial batch construction.
Single loose type: suitable for more detailed distribution requirements, but requires an efficient mixing system to avoid agglomeration.
5. Surface coating
Coating type (such as copper plating, zinc plating): Improves fiber corrosion resistance and is suitable for long-term exposure or hot and humid environments.
Uncoated type: High cost performance, suitable for ordinary building structural concrete.
2. Performance index comparison: How to select the most "powerful" steel fiber?
In specific applications, the following key performance indicators determine the reinforcement effect of steel fiber in concrete:
1. Aspect Ratio
The larger the aspect ratio, the more the fiber can cross cracks and provide a bridging effect, but too high may also affect dispersion. The generally recommended ratio is between 40 and 80, adjusted according to the construction process and mixing conditions.
2. Volume Fraction
The common dosage range is 0.5% to 2.0%. The higher the dosage, the better the reinforcement effect, but the requirements for mixing uniformity and construction fluidity are also higher.
3. Tensile strength
Excellent steel fibers should have a tensile strength of at least 1100 MPa, and some high-performance products can reach 2000 MPa to cope with crack opening stress.
4. Geometric shape and mechanical anchoring ability
Special-shaped fibers such as end hooks and waves can provide stronger pull-out resistance through "mechanical locks" after the concrete hardens, improving the overall toughness of the composite material.
3. Application suggestions: Scenario determines the choice
Depending on the type of project and functional requirements, the choice of steel fiber is also different:
Application scenario Recommended fiber type Special suggestion
Industrial floor Steel plate shear type + special-shaped fiber Control shrinkage cracks and prevent wear
Tunnel lining Steel wire cold-drawn type + end hook type Improve crack resistance and support stability
Bridge deck or thin shell components Melt-drawn ultrafine fiber + UHPC Improve crack resistance and impact resistance
Marine structure / high humidity area Stainless steel fiber or galvanized fiber Prevent rust and extend life
Prefabricated components / rural buildings Rows of bonded steel wire fibers Improve construction efficiency and reduce costs
Conclusion: Accurate matching to create tough structures
Through the multi-dimensional cognition and analysis of the raw materials, processes, shapes and performance indicators of steel fibers, do you have a clearer judgment on how to choose steel fibers? In actual engineering applications, scientific selection combined with structural design requirements and construction conditions can truly give play to the enhanced advantages of steel fiber concrete.
If you have specific project requirements or are unsure of the direction to choose, it is also recommended to consult a professional building materials technical support team to tailor a steel fiber solution for you.