Abstract
32CrMoV12-10 and 31CrMoV9 steels are used not only for components in the automotive industry, but also for firearms parts in the weapons industry. In these applications, high strength and surface layer hardness is required while maintaining the toughness of the core, which is achieved by nitriding. The aim of the work was to determine which of the steels exhibits better physical, mechanical and chemical properties after nitriding in a gaseous atmosphere. Metallographic samples were made to compare the structure of the nitride layer after nitriding. Hardness and fracture toughness were measured and Charpy impact testing and corrosion resistance evaluation were also carried out. The test results revealed that 31CrMoV9 steel shows better physical and chemical properties than 32CrMoV12-10 steel.
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