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4140 Tempering Curve
2

4140 Tempering Curve

4140 Tempering Curve

(OP)
Hi,
does anyone know if there is data available for a hardness vs temperature curve for 4140 steel at a certain time. I have been looking everywhere and cant seem to find it.

Your help would be much appreciated.

thank you

Paras

RE: 4140 Tempering Curve

The ASM Heat Treater's Guide has a hardness vs. tempering temperature chart but my version does not show any time reference. What time are you looking for?

RE: 4140 Tempering Curve

(OP)
Anywhere between 2 and 72 hours will work. Another thing I forgot to mention was that is the 4140 material air cooled instead of quenched

RE: 4140 Tempering Curve

2
Here you go.

it is on page 148

http://www.akronsteeltreating.com/images/ast-book....

As for the time: 2 hours at temperature.

As for cooling from tempering temperture:
Air cooled is best. However, if it is not complex geometry or very thin it can be quenched. This won't affect the microstructure but will induce some residual stresses.

Design for RELIABILITY, manufacturability, and maintainability

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