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Vacuum annealing furnace

Categories：	Textile machine / Machine fittings
Usage：	furnace

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Shanghai Hao Yue furnace technology Co., Ltd.

Tel:	86-21-51095297
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Country/Region :	China
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Contact :	Li Wei ()

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Description: Annealing is a heat treatment process in which the workpiece is heated to an appropriate temperature for a certain period of time and then slowly cooled. The annealing method in vacuum annealing furnace is also different. The following is a brief introduction to the types of annealing in vacuum annealing furnace.
1. Complete annealing and isothermal annealing
Complete annealing, also known as weighted crystallization annealing, is generally referred to as annealing. It is a heat treatment process that heates steel or steel to 20-30 degrees above Ac3 for a long time, so that the structure can be completely austenitized and slowly cooled to obtain a nearly balanced structure. This kind of annealing is mainly used for the casting, forging and hot-rolled sections of various hypoeutectoid carbon and alloy steels, and sometimes for welding structures. Generally, it is used as heat treatment of some non-heavy workpieces or as pre-heat treatment of some workpieces.
2. Spheroidizing annealing
Spheroidizing annealing is mainly used for eutectoid carbon steel and alloy tool steels (such as steel grades used for making cutting tools, measuring tools and dies). Its main purpose is to reduce hardness, improve machinability and prepare for subsequent quenching.
3. Stress relief annealing
Stress relief annealing, also known as low temperature annealing (or high temperature tempering), is mainly used to eliminate residual stresses in castings, forgings, weldments, hot rolled parts, cold drawn parts, etc. If these stresses are not eliminated, deformation or cracks will occur in the steel parts after a certain period of time or in the subsequent cutting process.
4. Incomplete annealing
The steel is heated between Ac1-Ac3 (hypoeutectoid steel) or Ac1-ACcm (hypereutectoid steel) and slowly cooled after heat preservation to obtain a heat treatment process with nearly balanced structure.
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