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Gas nitriding can be applied to unalloyed steels and irons to produce a corrosion- and wear-resistant nitride layer. In alloy steels that contain nitride-forming alloy elements (Cr, Mn, Mo, V, W, Al, Ti) a deeper diffusion layer develops. Nitriding materials include a number of steel types:
- Carbon steels
- Hardenable alloy steels
- Special nitriding steels such as Nitralloy
- High alloy steels: tool steels, heat-resistant steels (e.g. valve steels) etc.
- Stainless steels (ferritic, martensitic, austenitic, PH grades)
- Cast iron (grey or nodular)