Solidification of marine castings is one of the key links related to the quality of marine castings. It has a great influence on the whole process of marine castings. In order to better control the solidification of marine castings, relevant personnel have studied and summarized the factors affecting the solidification of castings: the temperature gradient of castings. The width of solidification zone depends on the temperature gradient of the inner and outer layers of the casting when the range of alloy crystallization temperature is fixed. The smaller the temperature gradient, the wider the solidification zone. (large internal and external temperature difference, fast cooling, narrow solidification zone).

The crystallization temperature range of the alloy. Small range: the narrower the solidification zone, the more inclined to solidification layer by layer. For example: sand casting, low carbon steel solidification layer by layer, high carbon steel paste solidification. Casting is an indispensable metal forming object for the development of industrial production, and its application in industry is everywhere. With the rapid development of China's industry, the requirements of the industry for relevant castings are becoming increasingly strict. In addition, under the survival system of survival of the fittest, domestic casting enterprises should actively deal with problems, and ensure that every link in the casting process is not neglected, including casting solidification, Only in this way can we defeat our competitors and survive in the industry.

1. The service temperature of clay castable is 1300 ~ 1450 ℃, which is generally used as the lining of steel rolling heating furnace, various heat treatment furnaces, boilers, shaft kilns and rotary kiln preheating belts

2. The service temperature of high alumina castable is 1400 ~ 1550 ℃, which can be used as the lining and burner of various heat treatment furnaces, the lining of electric furnace tapping tank, high temperature section of lime shaft kiln, kiln head of rotary kiln, power plant boiler, etc

3. The service temperature of corundum castable is 1500 ~ 1650 ℃. It is mainly used as the lining of high-temperature components of various high-temperature furnaces, such as the outer lining of immersion tube of molten steel vacuum degassing device, the lining of spray metallurgy and argon blowing integral spray gun, the lining of electric furnace top, LF furnace cover, and the high-temperature wear-resistant lining of catalytic cracking reactor in petrochemical industry

4. The Low Cement Castables are mainly used as thin linings and linings of high-temperature refractory components with metal anchors, such as the outer linings of water-cooled tubes of heating furnaces, the linings of integral spray guns for jet metallurgy, and the linings of immersion tubes of RH and DH vacuum degassing devices

The same kind of clay castables, high alumina castables, corundum castables, Low Cement Castables, etc. also have different use temperatures and uses due to different aluminum content and density. It is suggested that the marine casting manufacturer should select appropriate refractory castables according to their own kiln conditions.