Improving Microstructure of AISI H13 Extruding Dies Using Ion Nitriding

A varied range of aluminum profile shapes are produced by hot extrusion and the die typically used is steel AISI H13. The quality and dimensions of the extruded pieces are determined by tribological and surface conditions of the die-bearing surface. Dies for hot extrusion require good metallurgical characteristics and chemical stability against hot aluminum. Experiments were conducted to evaluate the performance of specimens treated with conventional nitriding, and the ion nitriding process. Microstructural characterization, X-ray diffraction profiles, and wearing tests were carried out on the surface of H13 specimens. The ion nitriding process showed advantages over the conventional nitriding process, including productivity and tooling life.