In order to adapt to the requirements of different processes and materials, Nitrided Barrel Head Nitrided Alloy Steel as base materials in all Plastics industry standard barrels Head. Thickness from 0.5 to 0.7 mm, hardness 65-68 HRC, Principle of Nitrided process is based on penetration of atomic nitrogen into the peripheral steel layer with the temperature of 550 C and it causes increasing the peripheral toughness by formation of nitrites and by depositing the Nitrided atom in areas between grids which causes grid tension