Stainless steel annealing equipment one of the commonly used processes. Metal workpiece can effectively improve its toughness, plasticity and other properties by heat treatment and annealing. Today’s focus is on the difference between incomplete annealing and complete annealing.
Incomplete annealing, also known as incomplete crystallization annealing, is a process in which the steel is heated to a certain temperature between Ac1 and Ac3 or between Ac1 and Acm, and cooled down slowly after heat preservation, so that the microstructure of the steel is not completely recrystallized. Complete annealing refers to the heat treatment process of hypoeutectic steel, which is heated to 20 ℃ above Ac3 and cooled slowly with the furnace after heat preservation, in order to obtain a heat treatment process close to the equilibrium structure (pearlescent structure), also known as recrystallized annealing.
The main differences between incomplete annealing and complete annealing can be summarized from the following four points: (1) incomplete annealing is also called incomplete crystallization annealing. A certain temperature between the steel heating channel Ac1 and Ac3 or between Ac1 and Acm is cooled down slowly after heat preservation, so that the microstructure of the steel is not completely recrystallized. (2) incomplete annealing is to heat the workpiece to semi-Austenization for annealing. Complete annealing is to heat the workpiece to full Austenization for annealing. (3) incomplete annealing is generally used in hypereutectic steel, and hypoeutectic steel can also be used, while complete annealing is generally used only in hypoeutectic steel. (4) flake pearlite is generally obtained by complete annealing, but spherical pearlite is obtained by incomplete annealing.
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Post time: 05-10-2019