Why Is Gray Iron More Suitable For Enamel
Cast iron enamel is an important part of my country’s enamel industry. Steel plate enamel and cast iron enamel account for about 80% of the total output. When learning about enamel, it is very necessary to understand cast iron enamel. A fan once asked: The iron used for enamel on the market is mostly gray iron, why is this?
The difference between low-carbon steel and cast iron can be determined by the carbon content: steel with a carbon content below 0.006~2.06%, and cast iron with a carbon content above. When cast iron melts, if the silicon content is high and the cooling is slow, a large amount of carbon will be precipitated into graphite, and the cross section will be gray, which is called gray cast iron or gray iron; A large amount of iron carbide (Fe3C) has a silver cross-section and is called white cast iron, also known as white iron.
White iron is not suitable for enamel materials because carbides are easy to decompose, releasing CO and CO2 gases, which are easy to cause defects, and are too brittle and hard. Gray iron, because the carbon exists in flake-like free graphite, can be well combined with enamel, and itself is slightly tough, so it is suitable for making iron blanks for enamel materials.
Nolifrit is a supplier of enamel frits and inorganic pigments, providing customers with one-stop service. If you have any questions about enamel, please contact us!
jack@nolifrit.com