Steel Fiber

Concrete reinforced with steel fibers (STF™ code) or SFRC (Steel Fiber Reinforced Concrete) is a concrete that uses steel fibers to reinforce it. This type of concrete, which is also known as fiber concrete, has found many applications in industries. Considering the many capabilities of concrete reinforced with steel fibers, committee 544 of the ACI institute has compiled the regulations for its use in fiber concrete. At present, the information of engineers and experts active in the field of construction and concrete flooring implementers regarding This type of fiber and its complement i.e. polypropylene fiber or PP fiber are a lot.


Steel fibers have different types according to their cross-sectional shape, which include circular steel fibers, rectangular steel fibers, semicircular steel fibers, and fibers with irregular or variable sections in length. Also, these fibers can be straight or curved with different dimensions. To describe this parameter, a factor called aspect ratio is used. This parameter is the result of dividing the length by the diameter (if the cross-section is not circular, the diameter of the circle equivalent to the desired cross-section can be calculated). Also, these fibers are available in two forms: hooked steel fibers and sinusoidal steel fibers. Its hooked and sinusoidal type is much better than its simple type and creates a lot of conflict in concrete. In terms of quality and quantity, it improves more properties of SFRC concrete.


  • Increased tensile strength
  • Increased energy absorption and impact resistance
  • Increased resistance to fatigue and rupture strain
  • Increased resistance to thermal stress and shrinkage
  • Increasing shear, bending and compressive strength
  • Saving time, money and materials
  • Increased malleability or ductility


  • Reinforcement of concrete floor of factories
  • Bridges and highways
  • Dams and hydraulic structures
  • Railway structures
  • Port construction projects and marine structures
  • Tunneling and mining


  • In 10-20 kgs bags


  • Copper
  • Gray

technical specifications

Physical Properties

Equivalent diameter

0.8-1.2 mm

tensile strength


Fiber length

30-50 mm


Bright and clean wire

Fiber type

Sinusoidal and hooked fibers

For Engineers

The mix design of steel fiber reinforced concrete or SFRC is the same as the mix design of conventional concrete; with the difference that in order to achieve proper efficiency and maximum use of steel fibers, the proportions must be changed. This problem may be satisfied by changing the maximum aggregate size, changing the percentage of cement or adding fly ash. According to the relationships presented in ACI 544.4R-2, the design process of steel fiber reinforced concrete or SFRC can be categorized as follows: the flexural strength of normal concrete behavior is calculated until the first crack; But in concretes reinforced with steel fibers or SFRC concrete, the strength of concrete increases slightly compared to its resistance at the first crack; Therefore: f_d=f_ct (1 R_(e,3)/100) f_d=f_ct f_(e,3) in these relationships: f_d=flexural capacity f_ct=initial cracking resistance f_(e,3)=P_(e, 3)*L/(bh^2 ) R_(e,3)=f_(e,3)/f_ct *100 h,b= depth and width of the section. P_(e,3)=L/150 is the average amount of load that changes the shape of the beam to the amount of compressive strength observed experimentally. By adding steel fibers to concrete, its compressive strength is increased as follows. F_f=F_c (1 K_1 P)=F_c*α which in the above relation: F_f= compressive strength of concrete reinforced with steel fibers F_c= compressive strength of concrete without fibers K_1= experimental constant 0.123 P= volumetric percentage of steel fibers α= coefficient magnification

technical documents

Technical Data Sheet (TDS)


Safety Data Sheet (SDS)




Photo Gallery

Frequently Asked Questions

What is the best type of steel fiber?

The type of steel fibers with hooks is the best type from the point of view of the high impact it creates in concrete.

What is the characteristic of steel fibers?

Steel fibers, mortar or concrete contain discrete discontinuous fibers that are spread pneumatically at high speed on the surface.

What is the difference between shotcrete with steel fibers and ordinary shotcrete?

Shotcrete reinforced with steel fibers has higher tensile strength than unreinforced shotcrete.

What are the advantages of using steel fibers?

Increasing the bearing capacity of concrete, reducing the thickness of the concrete slab, the load capacity is not reduced by concrete cracks and...


There are no reviews yet.

Be the first to review “Steel Fiber”