HEF DURFERRIT JAPAN Company Profile

The classic salt bath soft nitriding treatment, Tuftride, and QPQ treatment are revived here. Significantly improves the sliding characteristics and corrosion resistance of machine parts. Complies with REACH regulations.

1. What is nitriding treatment: Nitriding is a process that involves permeating nitrogen ions into the surface of materials such as steel and titanium alloys to harden them. By allowing nitrogen ions to penetrate the metal, nitrides of the added elements in the base material (Cr, Al, Mo) are formed (CrN, AlN, Mo2N), creating a hard compound layer. The hardness of this compound layer depends on the amount of these additives, exceeding Hv1200 in alloy steels. There are methods that utilize salt baths, gas atmospheres, or ion environments. 2. Characteristics of salt bath soft nitriding treatment: - Unlike carburizing and high-frequency quenching, there is minimal deformation after treatment, eliminating the need for subsequent polishing. - There is no reduction in fatigue strength after treatment, as seen with hard Cr plating or zinc plating. Nitriding treatment not only improves resistance to galling, wear, and corrosion but also enhances fatigue strength. - In gas and ion nitriding, for complex-shaped parts, gases and ions may not circulate uniformly along the part's shape, leading to uneven nitriding. In a salt bath, abundant nitriding ions circulate uniformly over the entire surface of the part, forming a consistent nitriding layer. A dense and tough nitrided compound (ε-iron nitride) layer improves sliding properties. A porous layer of a few micrometers at the very surface retains lubricating oil, ensuring favorable sliding conditions. 3. Characteristics of Tuftride and QPQ: - Compliant with REACH regulations, zero use of toxic substances, and zero wastewater (all solid waste).