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Heat & surface treatment
Heat & surface treatment
The full range of heat treatments – in Germany, the Czech Republic, India and China.
The term martensitic hardening refers to a heat treatment process consisting of austenitization and cooling under conditions that produce an increase in hardness through the more or less complete transformation of austenite into martensite.
Austenitization is the treatment step in which the workpiece is brought to the austenitizing temperature and full phase transformation and carbide dissolution change the matrix of the steel to austenitic.
Austenitization is followed by the cooling step. To ensure that the entire workpiece assumes a martensitic structure, the speed of the temperature drop must be greater than the critical cooling rate of the particular steel.
Cooling can be carried out in a range of different media characterized by their cooling effects in the different temperature ranges.
Case hardening is one of the thermochemical processes. In this process, the surface layer of components and tools is carburized with a carbon-emitting medium and then quenched, improving the mechanical properties (e.g. wear) of the component's surface layer.
Carburization is usually at temperatures of 880 to 950° C. After the hardening of the carburized parts, Tempering is generally required to reduce the stresses resulting from hardening and to achieve the required strength.
A range of different systems such as chamber furnaces and continuous furnaces are available for case hardening. Oils are generally the media used for quenching.
The process of adding nitrogen to the surface of a steel usually from dissociated ammonia as the source. Nitriding develops a very hard case after a long time at comparatively low temperature, i.e. 480°C to 530°C without quenching. No further heat treatment is necessary.
High wear resistance against abrasion and adhesion
Creation of corrosion resistant layers
Reduction of coefficients of friction
High temperature strength and tempering resistance of the surface layers to about 500° C
Nitriding of stainless steel is much complicated compare to other material, due to the compact oxide layer on the surface. That means an activation process before nitriding to remove the oxidation layer is critical.
Enhance surface strength and wear resistance, especially adhesive wear resistance