The thick plate generally adopts a relatively think hot-rolled steel plate mainly produced by a 4-degree reversible type rolling mill, and a plate with a thickness of 6mm or more is called a thick plate while a plate with a thickness of 100mm or more is called an ultra-thick plate.
These plates an important welded structure as a member of the framework, and the major required character include chemical composition, material, dimension, shape, surface, internal quality, etc.
Additional requirements, including weldability and processability, may be raised depending on the application.