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The heat channel treatment can be divided into ten aspects: normal fire, annealing, solid solution heat treatment, solid solution treatment, aging treatment, quenching, tempering, carbon and nitrogen infiltration of steel, and quality control treatment.

1. Normalizing: the steel or steel parts are heated to the appropriate temperature above the critical point AC3 or ACM for a certain period of time and then cooled in the air to obtain the heat treatment process of pearlitic tissues.

2. Annealing annealing: hypoeutectoid steel workpiece heated to above AC3 20 to 40 degrees, heat preservation after a period of time, with the slow cooling furnace (or buried in the sand or lime cooling) to 500 degrees Celsius in air cooling heat treatment process.

3. Solid solution heat treatment: heat the alloy to a high temperature single-phase zone at a constant temperature so that the excess phase is fully dissolved into the solid solution, and then cool quickly to obtain the heat treatment process of the supersaturated solid solution.

4. Aging: when the alloy is placed at room temperature or slightly above room temperature after solid solution heat treatment or cold plastic deformation, its performance changes with time.

5. Solid solution treatment: make all kinds of phases in the alloy dissolve fully, strengthen the solid solution, improve toughness and corrosion resistance, eliminate stress and soften, so as to continue processing and forming.

6. Aging treatment: heat and keep warm at the temperature of the precipitated phase, so that the precipitated phase of the enhanced phase can be precipitated out, hardened and strengthened.

7. Quenching: the steel austenitizing with proper cooling, cooling speed after all or certain parts within the cross section within the scope of martensite and unstable organization structure change of heat treatment process.

8. Tempering: after hardening of the workpiece heated to a critical point AC1 under proper temperature keeping time, method of cooling, then used to meet the requirements to obtain required by the organization and performance of heat treatment process.

9. Carbonitriding of steel: carbonitriding is the process of simultaneously infiltrating carbon and nitrogen into the surface of steel. Traditionally known as cyanosis, carbonitriding is widely used in medium temperature gas and low temperature gas carbon nitriding (i.e., gaseous soft nitriding). The main purpose of medium temperature gas carbonitriding is to improve the hardness, wear resistance and fatigue strength of steel. The main purpose of low temperature gas carbonitriding is to improve the wear resistance and bite resistance of steel.

Quenching and tempering: the quenching and tempering heat treatment combined with quenching and tempering is commonly used as quenching treatment. Conditioning is widely used in all kinds of important structural parts, especially connecting rods, bolts, gears and shafts that work under alternating loads. After the tempering treatment, the tempered soxhlet structure was obtained. Its hardness depends on high temperature tempering temperature and is related to steel tempering stability and workpiece section size, generally between hb200-350