Nitrided structural steel. History and interesting.
Are you interested in nitride structural steel from supplier Alekhlas? Here you will find interesting information on this topic.
General information
Nitride steel — alloy or nitridebased components in the composition are mostly mild. Nitriding helps to increase their surface hardness. Such steels are used in applications where it is necessary to significantly increase the wear resistance of the surface
Steels suitable for nitriding are chrome-molybdenum steel, which has aluminium. This element with chemical-heat treatment in nitriding produces a much higher surface hardness.
Of elements forming the nitride of aluminum, chromium, vanadium and molybdenum, particularly affect surface hardness chrome and aluminum. 1% of aluminum leads to a higher increase in hardness than 3% chromium. This is because aluminium does not form carbides and is therefore fully available for formation of nitrides.
The lower content of molybdenum and vanadium increases the resistance to the release and reduces the sensitivity to brittleness. Higher surface hardness, caused by the additional elements, nitride steels leads to a low tendency of adhesion to the adjacent surface, which is subjected to wear. Appropriately increasing the resistance to abrasion. At the same time increased surface hardness leads to a higher risk of cracking at mechanical load.
Factors influencing the nitriding process
Since the deformation of nitrided components depends not only on thin, hard nitride layer but also by the chemical composition and structure of the basic material, for all nitrided steels the following applies: the more homogeneous and fine-grained the structure is, the better the result of nitriding.
Supplier — the company Avecho offers at affordable prices from the manufacturer a diverse range of nitride structural steels which conform to the technical tribuneboston and foreign standards. Supplier guaranteed timely delivery at any address specified by the consumer.
The dynamics of formation of the nitride containing layer
Nitrogen is transferred from the environment in the following ways:
Adsorption of nitrogen atoms on the surface of the component
Absorption of the nitrogen atoms of the surface of the component
Diffusion of nitrogen atoms along the grain boundaries and inside the grains
The nitrides are formed around certain points on the surface of the component. With increasing nitrogen concentration and time of nitriding, the nitrides grow deeper and expand across the grain up to the formation of a closed layer. Along with elements of the nitride forming alloy, nitrides form and is dispersed in a submicroscopic region in the metal matrix. It is almost inevitable that this layer exhibits a certain degree of porosity. This is due to the recombination of molecular nitrogen in the energy of the suitable spots, such as grain boundaries in the interconnection layer.
The composition of the nitride layers can be significantly modified by adapting the conditions of nitriding, and the systematic selection of materials.
The transition from the hardness of the diffusion zone to the hardness of the basic material forms an intermediate zone, which differs from the surface layers, reduces the risk of fracture under mechanical strain. The nitride layers are also heat resistant up to 550 ° C. hardness Change nitriding correlated with the thickness of the nitride layer. The higher the content nitridebased component in the base material, the higher the surface hardness that can be achieved.
Compressive residual stress in the nitrided surface layer also increases, which leads to increased fatigue strength. It is, however, also reduces the depth of hardness of nitriding, which can be achieved, since the alloying elements interfere with the diffusion of nitrogen into the inner part of the component.
Properties of nitrided steels
High abrasion resistance
High surface hardness
The lower the coefficient of friction
Increased corrosion resistance
High temperature resistance up to approximately 500 ° C
Increased fatigue strength
Good dimensional accuracy and shape.
Supplier — the company Alekhlas — offers to purchase various brands of nitride structural steels, which correspond to all technical standards and requirements. Products can be purchased at a price formed on the basis of European and world standards of production. Possible, wholesale and retail, for regular customers a flexible system of discounts.