Can we reduce the time holding in heat treament before quenching ?
Can we reduce the time holding in heat treament before quenching ?
(OP)
In order to reduce the cost of our heazt treatment we look for reducing the time holding of heat treatment espacialy in the holding in austenitic area before the quenching.
For a standard alloy steel like 20Mn6 or 25CD4 when the temperature imposed have reach the right value we hold the furnace a this temperature for 2 hours + 1 hour par inch of thickness.
Question :
1- Can we reduce the time holding of 2 hours, since there is no chemical diffusion like in homogeneising ?
Thanks in advance for all if you have a answer !!
Stan
For a standard alloy steel like 20Mn6 or 25CD4 when the temperature imposed have reach the right value we hold the furnace a this temperature for 2 hours + 1 hour par inch of thickness.
Question :
1- Can we reduce the time holding of 2 hours, since there is no chemical diffusion like in homogeneising ?
Thanks in advance for all if you have a answer !!
Stan





RE: Can we reduce the time holding in heat treament before quenching ?
Hope this helps.
Rao Yallapragada
RE: Can we reduce the time holding in heat treament before quenching ?
Me too i'm so surprised to soak for 2 hours ?
But in other hand, i have look for indications in Volume 4 of ASM handbboks and i have not found any things for time soking for steel casting...
May be i don't look for well !
RE: Can we reduce the time holding in heat treament before quenching ?
RE: Can we reduce the time holding in heat treament before quenching ?
I also think that you won't go wrong with "One hour per inch" rule.
Rao Yallapragada
RE: Can we reduce the time holding in heat treament before quenching ?
But my question what are the soaking time best time from your experiences ?
2 hous like us ?
1:2 like have sujected to me a friend ?
i dont have any clear answer !! is there any good paper on this ?
Thanks gain
RE: Can we reduce the time holding in heat treament before quenching ?
There is an excellent paper on this very subject. It deals with suggested austenitizing temperatures for various grades of steels, transformation of austenite as a function of time at temperature, etc;
"Heat Treatment Procedure Qualification, Final Technical Report" by The Pennsylvania State University
RE: Can we reduce the time holding in heat treament before quenching ?
metenger : you are an ANGEL,
RE: Can we reduce the time holding in heat treament before quenching ?
Metengr, can you please give the full reference for the Penn state uni paper so that I can get a copy? Any pdf version available on the Internet?
RE: Can we reduce the time holding in heat treament before quenching ?
here the link :
http:
RE: Can we reduce the time holding in heat treament before quenching ?
when i ask why 2 hoours the Heat treatment departement say me that 2 hours to be sure that all the transformation to the austenite is done ?
May be it's wrong , are you agree Cdots ?
RE: Can we reduce the time holding in heat treament before quenching ?
Trust us, you can reduce the time. You will need to run some tests to figure out how much.
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RE: Can we reduce the time holding in heat treament before quenching ?
I trust the experts of this forum.... my questions were just to be sure.
Thanks !
RE: Can we reduce the time holding in heat treament before quenching ?
We are processing 9.5 inch bar with a austenitizing furnace resident time of just over 1.5 hours, or less than 10 minutes per inch. You have to be careful (the PSU report seems to be an excellent reference), but there is no reason to hold to the 1 Hour per Inch rule if you know you can control the process.
rp