What are the advantages of Stainless Steel Fibre?
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As we know that concrete is one of the widely used construction materials across the world. However, many properties make this renowned structural material vulnerable to cracking. The studies indicate that there are varied reasons for cracking, and one of the predominant reasons amongst them is the weakness against tensile strength. Here comes the use of Stainless Steel Fibre. When Stainless Steel Fibre is incorporated in cement, it significantly enhances combined properties that include strength, toughness, energy absorption, durability, corrosion resistance, water tightness, appearance, and constructability.
Stainless Steel Fibre as a reinforcement material
Steel fiber is commonly used in the refractory business to reinforce intense temperature concretes. It is known to sustain the refractory strength in high-temperature gradients. Using steel fiber technology in refractory applications offers broadened benefits like excellent abrasion resistance, exceptional resistance to spalling, remarkable fracture toughness, superior resistance to mechanical and thermal shock along with consistent alloying features.
Better Strength, enriched Durability
As mentioned above, Stainless Steel Fibre reinforced concrete by resisting tensile cracking, fragmentation, and fatigue. The studies show that spacing plays a vital role in strengthening mechanisms. As the closeness of fibre and the bond between fibre and cement decides the quality and can endure tensile load also durability.
High Thermal Cycling
High Thermal Cycling or thermal conductivity is another promising advantage of Stainless Steel Fibre. When Stainless Steel Fibre blends with the matrix; it has a magical effect as it can offer high conductivity levels along with excellent temperature resistance, for demandingthermal applications. The types of Stainless Steel Fibre such as Ferritic stainless steel are
Presistant to corrosion and scaling at elevated temperatures. And Precipitation&#;hardening (PH) stainless steel fibres are known for developing high strength and hardness through heat treatment. Besides this, the consistent performance of the Stainless Steel Fibre makes it more desirable and it functions uniformly at every temperature. Another prominent feature of Stainless Steel Fibre is its continuous Fibre Soaking Temperature, as these fibres have the capacity of continuous Fibre Soaking Temperature up to Degree Celsius.
Corrosion Resistance
Another remarkable benefit of Stainless Steel Fibre is its high corrosion resistance. The studies reveal that the corrosion resistance of Stainless Steel Fibre is noteworthy as the presence of chromium, nickel, carbon, and additional elements such as copper, columbium, aluminum, and molybdenum, are embedded in it. It will completely enhance the desirable features of Stainless Steel Fibre. When Stainless Steel Fibre comes in contact with oxygen, a protective chromium oxide layer forms on its surface that acts as a passive film making the steel corrosion-resistant.
Alleviate Chemical Corrosion in Concrete
The Stainless Steel Fibre also possesses the capacity to resist chemical corrosion in concrete. And concrete is one of the inevitable materials used in industrial applications and is exposed to the harmful atmosphere thus vulnerable to chemical corrosion and this will be a hindrance to construction works. Many pieces of research have been conducted in this regard and found that when Stainless Steel Fibre is incorporated in cement it works effectively preventing corrosion due to chemical reaction.
High Compressive Strength
Many studies indicate that the compressive strength of the Stainless Steel Fibre incorporated cement performance is quite high. And it can reduce spalling and explosive failures due to high fire resistance. As per the study, the reinforcement provided by fibres can work at both amicro and macro level. At a micro-level fibres arrest the development of microcracks, leadingto higher compressive strengths, whereas at a macro level fibres control crack opening, increasing the energy absorption capacity of the composite. The ability of the fibre to control
Pmicro-cracking growth depends majorly on the number of fibres, deformability, and bond to the matrix.
Easy Handling
Another remarkable quality of Stainless Steel Fibre is its quality of dispersion. Due to this quality; Stainless Steel Fibre can be used in concrete especially in industrial applications suchas prefabricated segmental linings for tunnels. Apart from this, Stainless Steel Fibre is economical thus, affordable for industrial applications.
1. Melt Extract Steel Fiber
Melt Extract stainless steel fibers are spun directly from the melt using the company's advanced Melt Extraction (ME) and Melt Overflow (MO) processes. Rapid cooling of the fiber during manufacture (equivalent to 50,000 per second) "freezes" the metallurgical structure, capturing it in an optimum state to resist high temperature corrosion - a state which is impossible for conventionally cast steel to match.
melt extract steel fiber of our company impart increased thermal shock resistance, steep thermal gradients resistance and mechanical shock resistance, minimizing damage and delaying failure caused by cracking. By increasing refractory lifetimes steel fiber refractory reinforcement offers the end user a reduction in downtime and substantial savings in materials and labor costs. Melt Extract stainless fibers are fully annealed and therefore are more pliable and ductile. This is of particular benefit during the mixing cycle and when the refractory composite is installed. These pliable fibers are not only more user-friendly than the stiff "needle-like" cut fibers, but also have better flow characteristics. Dispersion is further aided by the optimum Aspect Ratio design guaranteeing rapid fiber separation during the mixing phase.
Cost savings are the main reason for adding stainless steel fibers. In all areas of high thermal and mechanical shock, fibers will at least double refractory life. Fiber costs up to 50% lower than comparable products. SUNSHINE®'s low cost but high performance melt extract steel fibers provide the quickest payback. Our quality product costs substantially less because we produce our molten steel and spun fiber on-line in one fully integrated manufacturing plant. We are able to keep fiber manufacturing costs to a minimum, which is reflected in the very competitive prices.
SUNSHINE® has developed melt extract steel fiber which features thermal shock resistance, steep thermal gradients resistance and mechanical shock resistance, minimizing damage and decaying failure caused by cracking. By increasing refractory lifetimes steel fiber refractory reinforcement offers the end user a reduction in downtime and substantial savings in materials and labor costs.
2. Cold Draw Stainless Steel Fiber
The use of Stainless Steel Fibers in the reinforcement of refractory materials provides substantial increase in refractory life and therefore a considerable reduction in maintenance costs. Stainless fibers significantly increase the tensile strength of the refractory in its critical period and greatly increase its energy absorption capability. Though discontinuous, fibers act as a crack arrestor and form a mechanical bond after cracks may occur. Stainless steel fibers greatly improve the flexural strength of the castable. This added increase in ductility contributes greatly to thermal shock and spall resistance.
Stainless fibers cannot perform above their melting temperatures. The critical factor therefore becomes the maximum temperature the fiber will resist oxidation. Were there are thermal gradients, if 70% of the refractory is below the critical temperature, the fibers will perform very well. Where frequent cycling between high and low temperatures occur, fibers will greatly improve refractory life.
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The addition of 2% by weight to the refractory materials is suggested. Stainless fibers can also be used to good advantage in refractory gunning applications. stainless steel fibers are manufactured to a nominal size of .0.5x19MMor 25MM.
3. Cold Draw Carbon Steel Fiber
low carbon steel fiber is used as a replacement for traditional reinforcement in various concrete applications such as: slab-on-ground, precast and shotcrete. With SUNSHINE® carbon steel fibers you can limit micro-cracking, expect excellent concrete strength and lower costs.
Carbon steel fibers have been used successfully over the last 30 years. Normal reinforcing such as rebar tend to only reinforce concrete in tension. The addition of steel fibers instead of rebar or wire mesh will create a concrete with much more plastic and ductile properties. By adding Steel Fibers you create a 3-Dimensional matrix similar to that of the aggregate throughout the mix. When reinforced in all directions you end up with a superior concrete design. Pads will bend instead of crack. The addition of 1" long steel fibers will increase flexural and bending strength by 1.5 to 3 times that of standard reinforced concrete. Steel fibers reinforce in three dimensions throughout the entire matrix. They restrain micro-cracking by acting as tiny reinforcing bars. The earlier a crack is intercepted and its growth inhibited the less chance it will develop into a visual crack or problem.
The advantages that steel-fibers offer. They include but are not limited to:
4. Slit Sheet Steel Fiber
To make slit steel fiber takes shearing cold-rolled steel sheets. Before cutting, using special slitting machines make the cold-rolled steel sheets roll up; and also, make the width of cold-rolled steel sheets to be the same as the length of the steel fiber, and then put into rotary tool or normal punch to cut off. Rotary tool axis and sheets are perpendicular in direction. Raw materials general use of the annealing of cold rolled steel, in order to improve the intensity, also can use other rolled steel sheets. Because of the high cost of the cold rolled steel plate, we often use leftover material as a raw material to reduce costs. Products are with high tensile strength , it can be easily dispersed, and can be easily integrated with the concrete. It is a product with excellent quality and reasonable price.
5. Micro Copper Coated Steel Fiber
Such products use high-quality steel wire, they are high-performance steel fiber, with the characteristics of the high tensile strength, crack resistance and shear strength, good toughness, etc. The product is widely used . Copper Coated Micro Steel Fiber is one of most important materials of RPC ( Reactive Powder Concrete ). RPC has the features of very high strength, high tenacity, very good durability and volume stability. It is a good and a new kind of construction materials.
Micro Steel Fiber is widely used in the building of high speed railway, expressway, RPC covering engineering components, exterior painting and constructional elements.
Specification of Micro Steel Fiber:
Diameter is between 0.2mm to 0.25mm.
Length is 13mm.
Tensile Strength is >MPa.
6. Mill Cut Steel Fiber
Technical Superiority:
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Economic Superiority:
1.concrete thickness reduced without affecting its strength, hence a cut in concrete consumption by 20-30%.
2.rebar partly or completely omitted.
3.a small dosage with 0.35% as the smallest and 0.4-0.8 as normal range.
4.construction cycle shortened by 25%, suitable for projects where continuous and fast concrete placing is required, such as ports, airports, tunnels, reservoirs and industrial floors.
5.the same applied for conventional concrete mixing & placing without addition of other equipment.
Zhuzhou Sunshine New Material Technology Co.,Ltd
www.sunshine-material.com; www.steelfiber.net.cn
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