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Cold crushing strength of refractories

[2021-04-01]
Compressive strength at room temperature refers to the maximum pressure that a material can withstand per unit area at room temperature, N/mm2 means megapascals (MPa). The compressive strength of refractory materials at room temperature is an important technical property of materials. Although the static load borne by refractory materials in general thermal equipment is not large, generally not more than 0.1~0.2 N/mm2, furnace roof bricks are not more than 0.4~0.5 N/mm2, large blast furnace bottom bricks, hot blast stove top , The lower layer of open-hearth heat storage checker bricks, the maximum load does not exceed 1 N/mm2. In addition to improper transportation and masonry, the material may be damaged due to impact and extrusion, and it is rarely damaged due to the low compressive strength of the material at room temperature. The current standards all stipulate that the normal temperature compressive strength of refractory products is not less than 10~15 N/mm2, and the requirement for advanced refractory products is above 25~30 N/mm2, mainly because the normal temperature compressive strength of refractory products is its structure The parameters, especially the sensitive parameters of the microstructure. The formation of the material's microstructure is restricted by various technological factors in the material preparation process, such as the characteristics of raw materials and the proportion of ingredients, particle size and gradation, and the combination of particles, the molding method and the sintering state, etc., all have a significant effect on the material. The microstructure has an important influence. Therefore, the compressive strength at room temperature is a reliable method to test the current process conditions. In addition, the normal temperature compressive strength of the material can be used to indirectly assess the pros and cons of other mechanical properties. For example, the normal temperature compressive strength of general refractory products is about 2 to 3 times the bending strength and 5 to 10 times the tensile strength; Good abrasion resistance and impact resistance are all corresponding to its high compressive strength at room temperature. Moreover, the method of measuring the compressive strength at room temperature is simple. Therefore, the normal temperature compressive strength is a routine inspection item for judging the quality of products.
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