Annealing furnace improves the machinability of low-carbon steel and low-carbon alloy steel;

Annealing furnace improves the machinability of low-carbon steel and low-carbon alloy steel;

The metal with a hardness of 160~230HB is easy to cut and process. The metal has high hardness, which is not only difficult to process, but also the tool is easy to wear, energy consumption is also high, the hardness is too low, the tool is easy to stick to the tool, and the tool heats and wears, and the surface of the processed part The finish is also very poor. The shading indicates that the cutting performance is good and the annealing hardness of low-carbon alloy steel is generally below 160HB, and the cutting performance is poor. However, normalizing (1-dot chain line) is used. As the amount of pearlite increases, the interlayer spacing becomes finer. Improved cutting performance.

Heat treatment of common structural parts in annealing furnace;

Normalizing can eliminate overheating defects in casting or forging production, refine the structure, and improve mechanical properties.

The process of solid carburizing in annealing furnace

The workpiece made of surface carburized steel, together with carburizing agent, is put into a carburizing box and sealed, put into a heating furnace, and heated to the state of austenitic iron, so that carbon invades and diffuses from the surface of the steel. After the treatment time, it will be carburized. The box is cooled, and only the carburized workpiece is taken out, and quenched once, quenched twice, and tempered.

This solid carburizing has an old history in the carburizing method and is not suitable for continuous processing of a large number of workpieces. It has a poor working environment and has a tendency to decline. However, the furnace and other equipment are also relatively simple, and a variety of small amounts of treatment are also more convenient and will not disappear. .

The carburizing mechanism of solid carburizing is based on gas carburizing, that is, the solid carburizing agent in the box reacts with oxygen in the air in the box to become carbon dioxide (CO2), and CO2 reacts with carbon to produce carbon monoxide (CO).

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