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Hardening and High-Temperature Tempering

Hardening and high-temperature tempering are classed as thermal heat-treatment processes.  Hardening and high-temperature tempering are combined heat treatment processes involving hardening followed by tempering at temperatures in excess of 400 °C.

The special feature of hardening and high temperature tempering is that the tempering is carried out at temperature of up to 700 °C.  This tempering results in the carbon, that is in solution in the martensite, being precipitated to form small ferrous-carbide beads.  The more intense the preceding hardening was, the finer the structure is following tempering.

Tensile strength, yield limits and hardness are all reduced by increasing tempering temperatures, while flexibility, contraction, and impact strength are increased.

As in hardening, hardening and high-temperature tempering is referred to according to the quenching medium used, as in water- oil- or air-hardening and high-temperature tempering.

Hardening and high-temperature tempering is appropriate for those components that will be dynamically loaded or where high resilience is required.  Because of their good strength and resilience properties, heat-treatable steels have a wide range of uses in the construction of machines and apparatus.

 

Suitable Materials

All hardenable steels

 

Advantages of Hardening and High-Temperature Tempering

  • High stability
  • Optimal tensile and impact strength
  • Good strength properties under alternating flexural stress
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