Classification of steel fiber types

Steel fiber, as a high-performance reinforcing material, has not been around for long, but its application in many fields such as construction, transportation, tunnels, prefabricated components, metallurgy, etc. is becoming more and more widespread. In order to meet the needs of different projects, the categories of steel fibers are constantly evolving and enriching. The following systematically sorts out the classification of steel fibers from multiple dimensions to help practitioners be more targeted in material selection and application.
Steel fiber has not been around for long, but its application fields are becoming more and more extensive. Correspondingly, the varieties of steel fibers are also increasing.
1. According to the appearance, there are: Straight steel fibers
Straight steel fibers (a): neat cross-section, easy processing, but weak anchoring force, suitable for occasions with low requirements for bonding performance;
Pressed steel fibers (b): formed by pressing to form edges and corners, improving the bite force with concrete;
Corrugated steel fibers (c): continuous wave shape, good deformation ability and tensile performance;
Hook-shaped steel fibers (d/e): with hooks at both ends, good anchoring effect, a more common form in engineering;
Big-headed steel fibers (f): enlarged or ball-shaped at both ends, can significantly improve tensile pull-out force;
Double-pointed steel fibers (g): sharp at both ends, conducive to forming crack control points in concrete;
Bundled steel fibers (h): bundled with multiple filaments, with excellent distribution and multi-point anchoring effect, suitable for structures with extremely high requirements for crack control.

2. According to the cross-sectional shape, there are: circular (a), rectangular (b), groove (c), irregular (d)

3. According to the production process, there are: cut steel fiber (cut with thin steel wire); shear steel fiber (cut with thin steel plate, strip steel);
milling steel fiber (cut with thick steel plate or steel ingot); melt-drawn steel fiber (drawn with molten steel). The most promising is melt-drawn steel fiber, which has the lowest price.

4. According to the material, there are:
ordinary carbon steel fiber (tensile strength is generally 300~2500MPa);
stainless steel fiber (according to the material, there are 304,310,330,430,446, etc.);
other metal fibers (aluminum fiber, copper fiber, titanium fiber and alloy fiber).

5. According to the surface coating state, there are:
no coating layer, surface coated with epoxy resin, galvanized, etc. Ordinary steel fiber without coating layer is widely used in industry.

6. According to the construction process, there are: injection and casting.

7. According to the diameter size, there are:
Ordinary steel fiber (diameter d＞0.08mm);
Ultrafine steel fiber (diameter d≤0.08mm);
Ultrafine steel fiber is mainly used to reinforce plastics and asbestos friction materials.