Clay Refractory Bricks for Casting

Foundry clay refractory brick is a refractory material used in the casting process. Its main components are refractory clay and fired clinker.
The production process of clay refractory bricks includes the use of refractory clay and fired clinker, which is made through steps such as crushing, mixing, molding, and firing. This type of brick has good thermal stability and refractoriness, generally between 1580°C and 1750°C. Clay refractory bricks are widely used in blast furnaces, hot blast furnaces, soaking furnaces, annealing furnaces, boilers, steel casting systems, and other thermal equipment, and are one of the most consumed refractory products. Especially in the casting process, clay refractory bricks are favored because of their simple production and low price. They are used to construct and protect the casting environment to ensure the smooth progress of the casting process and product quality.
In addition, this type of brick also includes bricks for specific purposes, such as ladle lining bricks and steel casting bricks. These bricks play an important role in the process of pouring molten steel from the ladle into the ingot mold, protecting the casting equipment from high temperature and chemical corrosion, while ensuring the quality of the casting.

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Description

Clay bricks for ingot casting

Refractory bricks for casting refer to clay bricks used in the process of pouring molten steel from a ladle into an ingot mold. They include ladle lining bricks and bricks for steel casting (including sleeve bricks, plug bricks, nozzle bricks, seat bricks, funnel bricks, center casting pipe bricks, center bricks, flow bricks, flow tail bricks, and ingot mold bottom bricks).

The products have good high temperature performance, accurate size and low production cost. Therefore, all countries in the world now use semi-dry method to produce ingot clay bricks.

Performance The main reason for the damage of clay bricks for ingot casting during the steel casting process is the chemical erosion and scouring of high-temperature molten steel and slag, as well as the influence of sudden temperature changes. The function and quality of bricks directly affect the quality of steel and are also related to safe production.

Products Description

Ladle lining bricks The technical performance of ladle clay lining bricks is Al2O336%~44%, refractoriness 1690~1750℃, load softening temperature T0.6 (0.2MPa) 1370~1430℃, reburning line change (1400℃, 2h) 0%~0.3%, apparent porosity 18%~19%, and room temperature compressive strength 29.4~39.2MPa. When high-temperature molten steel is poured into the barrel, the barrel lining is subjected to rapid scouring and thermal shock, as well as chemical erosion by the molten steel and slag remaining in the barrel. Therefore, clay lining bricks should have low impurities, high density and high precision dimensions, and be fired at high temperatures to obtain better thermomechanical properties than ordinary clay bricks.

Flow steel bricks The physical and chemical properties of flow steel bricks: Al2O336%~40%, refractoriness 1690~1710℃, reburning line change (1350℃, 2h) +0.1%~-0.3%, apparent porosity 17%~25%. This group of bricks requires good thermal shock resistance, so the porosity of the product is controlled between 17%~25%. Low porosity has poor thermal shock resistance, and high porosity has poor erosion resistance. At the same time, accurate external dimensions are required. Poor quality products will crack during use and cause steel leakage, so strict requirements are placed on the quality of flow steel bricks.

Production process Ingot clay bricks are produced by semi-dry method, and the process is the same as clay bricks.

Ingot clay bricks are solid bricks, hollow bricks, square bricks, and round bricks. Single-sided pressurization is used during molding, and special equipment for double-sided pressurization can also be used. Reasonable tolerances must be maintained in mold design, processing, and carburizing to press out qualified brick blanks. The molding pressure is 40~80MPa, and the brick bulk density is 2.10~2.38g/cm3. Ingot clay bricks are mostly square tubes and round tubes. They need to be installed vertically or sideways during firing. The height of the brick stack generally does not exceed 900mm to avoid deformation due to excessive pressure. The plug bricks and water outlet bricks should be blocked when loading the kiln to avoid direct contact with the flame and cracks.

Refractory products for casting

Brand/Item	Fire clay
	HX-N-40	HX-N-40	HX-N-40	HX-N-40	HX-N-36
Al₂O₃%	≥40	≥40	≥40	≥40	≥36
Fe₂O₃%
Apparent Porosity %	≤22	15-25	≤23	17～25	17～25
Bulk Density g/cm³
Refractoriness ℃	≥1710	≥1710	≥1710	≥1720	≥1700
Permanent Linear Change %		1350℃×2h 0～ -0.3		1350℃×2h +0.1～-0.3	1350℃×2h 0.1～-0.3

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