Steel fiber reinforced castables greatly enhance the thermal shock stability of wear-resistant castables by introducing heat-resistant steel fibers. The product has high wear resistance, thermal shock stability and volume stability.
Steel fiber reinforced castables are used in many parts such as aluminum melting furnaces and industrial kilns. Among them, corundum steel fiber wear-resistant castables are made of bauxite clinker as aggregate, bauxite clinker and corundum fine powder as matrix, ultrafine powder and other composite materials as binders and additives, and stainless steel heat-resistant fibers. Corundum steel fiber castable price Corundum castables add stainless steel fibers to increase strength
Steel fiber reinforced castables are hydraulic refractory castables made by adding appropriate heat-resistant stainless steel fibers and trace additives based on clinker corundum as aggregate and powder. They have the characteristics of resistance to rapid cooling, rapid heating, strength, high temperature resistance, impact resistance, thermal shock resistance, and wear resistance.
In addition to the conventional high-temperature erosion resistance, steel fiber reinforced castables have a certain amount of heat-resistant stainless steel fibers added to their ingredients to prevent the expansion difference between the aggregate and the matrix in the material under high temperature, and the stress caused by the temperature gradient change when the furnace is started and stopped, which leads to the damage of the furnace wall. At the same time, due to the addition of steel fibers, the overall strength of the furnace wall is enhanced after the material is cast.
Products Description
The heat-resistant steel fiber used in steel fiber reinforced castables is shaped like a boat-shaped sagger, with a cross-section of 0.2mmx1.0mmm and a length of 20mm, 25mm, 30mm and 35mm; the grades of heat-resistant steel fibers are divided into 330, 310, 304, 446 and 430 according to the international heat-resistant steel fiber grades, and the steel grades similar to the national standard (GB) are 1Cr15Ni36W3Ti, 1Cr25Ni20Si2, 1Cr18Ni9, 1Cr25Si2 and 1Cr18Si2. The addition of 1% to 5% heat-resistant steel fiber can achieve the effect of strengthening and toughening.
The heat-resistant steel fiber used in steel fiber reinforced castables should be selected according to the use conditions of thermal equipment and its appropriate dosage should be determined. Its preparation process: first weigh the refractory aggregate, powder, binder and admixture, dry mix for 1 minute; then add water for wet mixing, and evenly sprinkle the steel fiber into the material without agglomeration; finally mix for 1 minute before discharging. The total mixing time shall not be less than 5 minutes. When using a vibrating rod for molding, the vibration direction should be staggered to make the steel fiber distribution direction reasonable, which can improve the performance.
The performance of steel fiber reinforced castables tested at medium and low temperatures, such as thermal shock resistance and mechanical impact resistance, are significantly improved compared with those without steel fiber. However, in terms of 1400℃ high temperature flexural strength and slag resistance, steel fiber refractory castables are not as good as refractory castables without steel fiber.
Performance Table
Main physical and chemical indicators of steel fiber reinforced wear-resistant castables
|
project |
HX-GMJ65 |
HX-GMJ70 |
HX-GMJ75 |
HX-GMJ80 |
|
|
Al2O3(%)：≥ |
65 |
70 |
75 |
80 |
|
|
Bulk density (g/cm3)：≥ |
2.50 |
2.55 |
2.60 |
2.70 |
|
|
Flexural strength (MPa)：≥ |
110°C x24h |
10 |
10 |
11 |
11 |
|
1000°C x3h |
11 |
12 |
12 |
12 |
|
|
Compressive strength (MPa)：≥ |
110°C x24h |
70 |
75 |
80 |
80 |
|
1000°C x3h |
80 |
85 |
85 |
85 |
|
|
Line change rate (%) |
1000°C x3h |
0~-0.5 |
0~-0.5 |
0~-0.5 |
0~-0.5 |
|
Thermal shock resistance(times):≥ |
900°C water cooling |
25 |
25 |
25 |
25 |
|
Wear at normal temperature (cm3)：≤ |
900°C x3h |
6 |
|||
|
Maximum operating temperature (℃) |
1500 |
||||
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