Steel Fiber Thermal Shock Resistant Castable

Steel fiber thermal shock resistant castable is made of pure calcium aluminate cement, combined with corundum, alumina powder, bauxite, sillimanite, mullite, etc., with ultrafine powder and admixtures, and an appropriate amount of stainless steel fiber reinforcement. It is constructed after adding water and stirring on site.
Steel fiber thermal shock resistant castable is characterized by high strength, good toughness, good wear resistance, smoke erosion and corrosion resistance, strong thermal shock resistance and good spalling resistance; it can inhibit the shrinkage of castables during curing, baking and high-temperature use; improve the toughness, mechanical impact resistance and mechanical strength of castables; prevent the microcracks generated in the castables from expanding or extending under the action of thermal stress and mechanical stress, resulting in fracture or spalling.

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Description

The temperature rise or fall of refractory materials during use is inevitable, which will cause them to expand and contract, that is, thermal stress. When the thermal stress of the refractory castable exceeds its own structural strength, cracking or peeling will occur, and in more serious cases, the lining will even collapse.

Steel fiber thermal shock resistant castables are artificial synthetic materials developed by our company based on the large instantaneous temperature rise of large CFB units in recent years, which leads to the phenomenon of easy cracking and bursting of materials. Steel fiber thermal shock resistant castables are our company's technologically advanced products, with outstanding characteristics such as good overall stability and good burst resistance. It is mainly used in large CFB boiler igniters, ignition air ducts, and wind chambers, and has been used in many units above 410CFBt/h with excellent performance.

There are many kinds of steel fiber thermal shock resistant castables, such as steel fiber, thermal shock resistant, high aluminum, wear resistant, corundum and mullite, etc. Each material castable has a common characteristic, which is "thermal shock resistance". This is an important indicator for judging the quality of refractory castables, and it is also one of the bases for design, material selection and operation. It can also be called rapid cooling and heating, temperature change resistance and thermal stability.

Steel fiber thermal shock resistant castables are made of high-quality artificial synthetic materials as the main raw materials, and then added with high-quality composite binders and ultra-fine powders. Steel fiber thermal shock resistant castables have the characteristics of excellent thermal shock resistance, high refractoriness and high strength. It can ensure the overall structure of the circulating fluidized bed boiler lining. It is very suitable for use in relatively harsh environments such as ignition air ducts and water-cooled air chambers where the temperature fluctuations of CFB boilers are relatively large.

Its physical and chemical indicators are as follows

Brand/Projects and indicators		HXTA-1	HXTA-2
chemical composition (%)	AL₂O₃	≥75	≥65
Bulk density (g/cm³)	110℃×24ｈ	≥2.80	≥2.70
	1000℃×3ｈ	≥2.80	≥2.70
Flexural strength at room temperature (MPa)	110℃×24ｈ	≥10.0	≥9.0
	1000℃×3ｈ	＞18	＞16
Normal temperature compressive strength (MPa)	110℃×24ｈ	≥65	≥60
	1000℃×3ｈ	≥120	≥100
Line change rate after burning (%)	1000℃×3ｈ	-0.1	-0.2
Wear resistance cm3 [According to SATM (C-704 standard]		≤5.0	≤6.0
Thermal Conductivity ｗ/ｍ·ｋ		1.9	1.8
Thermal vibration stability (times) (1000℃×water cooling)		≥35	≥30
Refractoriness (℃)		≥1790	≥1750
Maximum operating temperature (℃)		≥1600	≥1500

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