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We offer exclusive heat treatment furnaces for Annealing process, which are used to heat the material to the annealing temperature range and maintain it at that temperature up to the specified time period. Being ideal for stress relieving and removing the work hardening of metals, these are robust in construction, durable and reliable. These furnaces use the most advanced technology and an efficient temperature control unit.
Spheroidization is achieved by holding the metal for a prolonged period at temperatures near the lower critical point or by a cyclic heating and subsequent cooling close to these temperatures. The process can be accelerated by prior deformation or hardening. Spheroidized annealing to form granular pearlite, especially in the case of high-carbon tool steels and the high-carbon steels used for ball bearings, serves to improve machinability and prepare the metal structure for hardening.
To eliminate segregation in the cast structure, it is frequently necessary to homogenize the part before usage to promote uniformity of chemical composition and microstructure. This treatment can also be used for complete dissolution of carbides and brittle and deleterious phases like sigma which are formed at operating conditions. In this method, steel is heated for a long enough period of time in order to complete the dissolution of carbides, and then the cooling starts at an appropriate rate to avoid formation of deleterious phases.
In this process, steel is heated above the upper critical temperature (910ºC) causing the structure of the steel to be converted rapidly into austenite structure. The steel is then cooled by forced means to a temperature below the lower critical temperature about 600ºC-700ºC. The steel is soaked at this temperature for a specified period of time for homogeneous structure. This is applied to low carbon and alloy steels to improve their machinability.
Normalizing Heat Treatment process is heating a steel above the critical temperature, holding for a period of time long enough for transformation to occur, and air cooling. Normalized heat treatment establishes a more uniform carbide size and distribution which facilitates later heat treatment operations and produces a more uniform final product.
Stress relieving is applied to both ferrous and non-ferrous alloys and is intended to remove internal residual stresses generated by prior manufacturing processes such as machining, cold rolling and welding. Without it, subsequent processing may give rise to unacceptable distortion and/or the material can suffer from service problems such as stress corrosion cracking. The treatment is not intended to produce significant changes in material structures or mechanical properties, and is therefore normally restricted to relatively low temperatures.
Hardening and tempering of engineering steels is performed to provide components with mechanical properties suitable for their intended service. Steels are heated to their appropriate hardening temperature {usually between 800-900°C), held at temperature, then "quenched" (rapidly cooled), often in oil or water. This is followed by tempering (a soak at a lower temperature) which develops the final mechanical properties and relieves stresses. The actual conditions used for all three steps are determined by steel composition, component size and the properties required.