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Tempering of Steels

Tempering of Steels

Tempering of Steels

(OP)
When Steel components are tempered is it possible during the heat treatment process to allow too much time soaking at the target tempering temperature?

RE: Tempering of Steels

youtectic;
Yes, it is possible. Standard tempering times for most carbon and low alloy steels are 1 hour/inch at tempering temperature with slight incremental increases in time based on thicker components. If you remain too long at a specific tempering temperature you will reduce strength properties from carbide coarsening.
 

RE: Tempering of Steels

(OP)
Thanks metengr
would this effect be applicable to PM parts also?

RE: Tempering of Steels

youtectic;
Although, I am not experienced in PM part processing, I believe the parameters regarding time at temperature would also apply to PM parts, based on what I have seen in literature.  

RE: Tempering of Steels

The time is a minor function.  If the target time is 2 hours you really shouldn't see any difference at 1.5 hours or 3 hours.  On the other hand a 50F shift in temperature can have a major impact.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

RE: Tempering of Steels

(OP)
Thanks for your reply Plymouth
I was also wondering if excessve time at temperature could have maybe a detrimental effect on the dimensional stability of small components?
 

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