The purpose of quenching

The purpose of quenching is to strengthen steel parts and give full play to the potential of steel properties.

Such as: improve the mechanical properties of steel parts, such as hardness, wear resistance, elastic limit, fatigue strength, etc.,

Improve the physical or chemical properties of some special steels, such as enhancing the ferromagnetism of magnetic steel, and improving the corrosion resistance of stainless steel.

The main purpose of quenching and annealing

1. The purpose of quenching: the material is changed from ferrite to austenite, and after rapid cooling, the unbalanced phase transformation obtains martensite, and obtains high hardness and strength

2. The purpose of annealing: to change the material from ferrite to austenite, and form ferrite in the equilibrium phase after slow cooling, reducing the hardness and facilitating processing.

What is the purpose of quenching and tempering the workpiece? (Guide: Stainless steel screw inspection method)

The purpose of quenching:

①. Improve the mechanical properties of metal materials or parts. For example: improve the hardness and wear resistance of tools, bearings, etc., improve the elastic limit of springs, and improve the comprehensive mechanical properties of shaft parts.

②. Improve the material properties or chemical properties of some special steels. Such as improving the corrosion resistance of stainless steel, increasing the permanent magnetism of magnetic steel and so on.

The purpose of tempering:

①. Reduce internal stress and reduce brittleness. Quenched parts have great stress and brittleness. If they are not tempered in time, they will tend to deform or even crack.

②. Adjust the mechanical properties of the workpiece. After quenching, the workpiece has high hardness and high brittleness. In order to meet the different performance requirements of various workpieces, it can be adjusted by tempering, hardness, strength, plasticity and toughness.

③, Stabilize the size of the workpiece. The metallographic structure can be stabilized by tempering, so as to ensure that no deformation occurs in the future use process.

④. Improve the cutting performance of certain alloy steels.

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