The use of nitride structural steel
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To buy nitrided alloyed steel in a significant range of brands and profiles is offered by Electrovek-Steel. There are good prices from the manufacturer. The supplier guarantees the timely delivery of products to the address specified by the consumer
Advantages of nitriding process
Nitriding is the process of diffusion saturation of the surface layer of steel with nitrogen when it is heated in dissociated ammonia. Such a chemical-thermal treatment is subjected to parts that work on wear when the surface is heated to 400 ° C.
Nitriding greatly increases the hardness of the surface layer, its wear resistance, the endurance limit, the corrosive properties in the atmospheric environment, water, etc. The hardness of the nitrided layer is higher than that of the cemented steel and remains heated to high temperatures (500… 550 ° C), then As the hardness of the cemented layer, which has a martensitic structure, remains only up to 200… 225 ° С.
Before nitriding, the parts are quenched, high tempered (improved) and finished. After nitriding, there is no need for further heat treatment. As a rule, after nitriding the parts do not have warping surfaces, or they are minimal. After nitriding, the parts are polished or polished, or not subjected to any machining at all. The nitriding of steel products is carried out in the temperature range of 500−620 ° C (depending on the geometry of the part, process requirements, the final properties of the product, etc.) in ammonia, which dissociates on heating, supplying active atomic nitrogen to the surface.
Buy nitrided steel at affordable prices offers the company Elektrovek-steel. Supplier provides prompt delivery of metal to any point set by the client.
Application of nitrided steels
Nitriding can be subjected to any steel and cast iron, but a wide practical use of many materials for nitriding have not received, because For example, the hardness of nitrided iron is very small and is about 340 HV.
For nitriding, steels alloyed with aluminum, chromium, molybdenum, vanadium are used. Chromium, molybdenum and vanadium increase the solubility of nitrogen in the α phase and form special nitrides MN and M 2 N. The highest values of the surface hardness of wear resistance during nitriding are achieved in chromium-molybdenum steels additionally alloyed with aluminum. Typical representative of such steels is steel 38Х2МЮА. In addition, molybdenum in steel eliminates release brittleness, which can occur with slow cooling.
Nitriding of thin-walled products is recommended to be done at temperatures of 500… 520 ° С. At these temperatures and an exposure time of 24… 60 hours, it is possible to obtain a layer of 0.3… 0.6 mm.
To accelerate the process, a two-stage nitriding is carried out: first at temperatures of 500… 520 ° С, and then at 540… 560 ° С. In this process, despite the high enough temperature, the high hardness of the nitrided layer remains. A significant reduction in the process, in 2−4 times, is achieved by the use of nitriding in a glow discharge.
Nitriding increases the fatigue limit of structural steels due to the formation of residual stresses in the surface layer. A thin layer of the ε-phase (0.01… 0.03 mm) protects well simple carbon steels with a carbon content of 0.1 to 1.0% of corrosion in a humid atmosphere and other environments.
The company Electrovek-steel offers to purchase at affordable prices structural alloyed steel, subjected to nitriding. The supplier provides prompt delivery of products to the address specified by the customer.