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Photos 1 Heat treatment with four fires 2 Classification of heat treatment furnaces Customers who bought this product also bought

Heat Treatment of Metallic Materials

In order to make metal workpieces have the required mechanical properties, physical properties and chemical properties, in addition to the reasonable selection of materials and various forming processes, heat treatment processes are often indispensable.

Heat treatment of metal materials is a process that uses appropriate methods to heat, preserve and cool solid metals or alloys to change the internal structure of the material, thereby improving the properties of the material. It is called heat treatment.

Heat treatment generally does not change the shape and overall chemical composition of the workpiece, but gives or improves the performance of the workpiece by changing the microstructure inside the workpiece or changing the chemical composition of the workpiece surface. Its characteristic is to improve the intrinsic quality of the workpiece, which is generally not visible to the naked eye. The function of heat treatment is to improve the mechanical properties of materials, eliminate residual stress and improve the machinability of metals.

Heat treatment with four fires


Relieve stress, improve cutting, reduce hardness (cooling in furnace)


Fast cooling (cooling in air)


Increase hardness, toughness, and plasticity. (cooled in water or oil), must be used with tempering.


Improve toughness

Tempering includes low temperature tempering, medium temperature tempering and high temperature tempering.

Low temperature: the internal stress is reduced, the brittleness is reduced

Medium temperature: improve elasticity and strength

High temperature: improve overall performance.

Tempering = quenching + high temperature tempering.

Classification of heat treatment furnaces

Classification of heat treatment furnaces
Principle of classificationHeat sourceOperating temperature
Furnace profileResistance furnace Fuel furnace Gas stove Oil stove Coal stoveHigh temperature furnace (>1000℃) Medium temperature furnace
(650~1000℃) Low temperature furnace (<650℃)
Principle of classificationFurnace conditionProcess use
Furnace profileBox-type furnace Pit furnace Bell furnace Through furnace Rotary hearth furnace Tubular furnaceAnnealing furnace Quenching furnace Tempering furnace Carburizing furnace Nitriding furnace Experimental furnace
Principle of classificationMode of operationMedium used
Furnace profileBatch furnace Continuous furnace Sphygmatic type Continuous typeAir medium furnace Flame furnace Controlled atmosphere furnace Salt bath furnace Oil bath furnace Lead bath furnace Fluidized furnace Vacuum furnace
Principle of classificationMechanical formControl form
Furnace profileTrolley type furnace Elevating bottom furnace Push-rod furnace Conveyor belt furnace Roll-bottom furnace Vibrating bottom furnace Walking furnaceTemperature control furnace Process control furnace Computer simulation control furnace

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