Enamel is a composite material made by high-temperature firing of metal and glass-based inorganic materials. Metals are divided into two categories: ferrous metals and non-ferrous metals. Among them, ferrous metals are most commonly used in the enamel industry, including steel enamel, cast iron enamel and stainless steel enamel. .

1. Steel enamel

Steel enamel is an enamel product with steel as the green body. The production process is roughly as follows: first, the steel is subjected to mechanical processing such as stamping, the steel is made into a green body, and the enamel glaze is applied and then fired at a high temperature to integrate the enamel and the green body. . Steel with low carbon content are not easy to cause defects in the porcelain layer, and those with less than 0.008% belong to industrial pure iron or ultra-low carbon steel. Ultra-low carbon steel has low carbon content, low strength and good formability, and is often used in enamel products.

2. Cast iron enamel

The enamel with cast iron as the green body is called cast iron enamel. The cast iron or scrap steel is melted at a high temperature, cast into the required green body shape, and then fired at a high temperature after applying the enamel glaze. The carbides of gray cast iron are easily decomposed during the enamel firing process, releasing CO, CO2 and other gases, causing defects in the enamel layer, and it is too hard and brittle to be suitable for enamel. The opposite is white cast iron. Carbon is not easy to be oxidized to release gas during the firing process. It is strong and tough and is the most common type of enameled cast iron. Ductile iron can also be enameled, but it is rare.

3. Stainless steel enamel

Enamel products with stainless steel as the body are called stainless steel enamel. Generally speaking, stainless steel can be used as enamel, but the enamelling process and chemical composition of enamel enamel are also very different for stainless steel with different chemical composition and crystal structure. Due to the poor adhesion performance of stainless steel enamel, there is a higher requirement for enamel process management, otherwise defects such as enamel and enamel are prone to occur.