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Quenched + Tempered or Normalized

Quenched + Tempered or Normalized

(OP)
Hello,

Material 1: Quenched + Tempered
Material 2: Normalized

Both of the materials have same mechanical properties (Tensile Strenght, Yield Strenght and Elongation).
Which one should be chosen considering just working conditions and performance of the material (Except costs or etc.) and why?
What is the approach?

Thanks in advance.

RE: Quenched + Tempered or Normalized

Q&T versus normalization heat treatment relates to achieving through thickness mechanical and improved notch toughness properties in certain steels. The quench and temper heat treatment will provide cooling to enable thicker material to achieve through thickness mechanical properties and improved notch toughness. Normalization heat treatment is really limited to thinner materials because of air cooling versus liquid quenching.

RE: Quenched + Tempered or Normalized

This sounds like another student question which is not allowed on this forum. Please confirm you are not a student, and are asking for professional reasons.

RE: Quenched + Tempered or Normalized

The answer depends upon the grade of material under consideration and the requirements for the intended application.

RE: Quenched + Tempered or Normalized

And unless these pieces of steel are relatively thin, they will not have the same mechanical properties.

RE: Quenched + Tempered or Normalized

If the normalized part gets you the mechanical properties that you need use it as it should be cheaper. However, as others said, the parts will not have the same mechanical properties. For a plain carbon steel, depending on the temper temperature, both can have similar tensile/yield properties. The quench and tempered part will have better impact toughness results however. The reason to go to quench and tempering over a normalizing treatment would be to either increase tensile/yield strength or toughness.

RE: Quenched + Tempered or Normalized

There will be very few cases where the tensile properties actually match. They may have the same UTS, or Yield but not both. and in most cases the Normalized material will have lower elongation. The Q&T will have better through section properties and superior toughness (and fatigue).

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube

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