Heat treatment of stainless steel
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Heat treatment
Heat treatment of stainless steel includes the operations of heating, soaking and cooling, which affect the structure of the workpiece. Heat treatment can be used to harden and soften the alloy. Decrease the strength when the workpiece has to be machined, for example cutting. Strength increase is necessary for structural steel.
Heat
Heating should ensure uniform heating of the workpieces, in which the material structure changes, but no deformation or cracks occur. Heating can be performed evenly or stepwise. Time and speed of heating determines the way: heating furnace, flame or high-frequency electric), mass of the workpiece and physical properties (heat capacity, thermal conductivity).
Excerpt
Extract is necessary in order to complete the process of structural transformation. If the workpiece is «overexposed», the alloy can begin to release carbon, which leads to the formation of scale.
Cooling
The cooling rate of the workpiece depends on the environment in which it is located. Cooling in water reaches a speed of 300 degrees per second, cooling in the oven — 20−30 degrees per hour. In the open air, the cooling process naturally occurs faster than in the oven.
Delivery, price
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