The main difference between pure titanium plate and composite titanium plate lies in their composition and usage.

Pure titanium plate is a metal composed of a single element (titanium dioxide), also known as the "glassy state", with high purity. This type of titanium plate has good heat resistance and corrosion resistance, as well as resistance to stress corrosion and cracking. Therefore, it is widely used in high-temperature and high-pressure containers in the petrochemical industry, as well as in oil production platforms and drilling platform tanks in marine environments. It is used as an inner lining material for equipment or as an anti-corrosion coating.

Composite titanium plate is a special stainless steel plate composed of two or more elements. These elements may include aluminum and other metallic elements such as molybdenum and niobium, and are therefore also known as composite steel, molybdenum based alloys, or niobium based alloys. Composite titanium plates have unique physical and chemical properties due to their special alloy composition, which can meet some special application needs.

Overall, pure titanium plates and composite titanium plates differ in composition, performance, and application, and need to be selected based on specific usage environments and requirements.