Relevance

The heating, curing and cooling of stainless steel affects its structure drastically. After such treatment the chemical composition remains unchanged, but the stainless steel changes its properties dramatically. A distinction is made between strengthening and unstrengthening heat treatments. Decreasing the strength of stainless steel is necessary when the workpiece is to be cut.

Heating

A deep, even heating transforms the structure. Heating is done directly, gradually or in steps. Heating time depends on the method (furnace, flame or electric high-frequency), on the weight of the metal and the physical properties of stainless steel (heat capacity, thermal conductivity). The rate of heating is determined by the type of billet, the chemical composition of the steel and the temperature range.

Endurance

The temperature reached ensures the completion of structural transformations. It is important to calculate the optimum time, otherwise the steel will be free of carbon and scale will form. At high heating temperatures, the holding time should be as short as possible.

Cooling

Cooling in water exceeds 300 °C per second, while with the furnace it is only 20-30 °C per hour. Cooling is faster in air than in a furnace. These processes increase hardness, strength, wear resistance, or improve the machinability of the material.

Furnizor

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