Recrystallization temperature for annealing
Recrystallization temperature for annealing
(OP)
Dear all,
Is the a possible method to calculate the "ideal" recrystallization temperature for any steel grade? I read through some articles..a 10degC difference could bring the annealling time additional 1 hour.
Recently the Product Developement team brought us some new steel grade for testing. The given temperature is rather low, and also a longer cycle. I dont think they really calculated the annealling cycle for some reasons. So, is there actually anyway to calculate the best temperature?
Thanks..
Is the a possible method to calculate the "ideal" recrystallization temperature for any steel grade? I read through some articles..a 10degC difference could bring the annealling time additional 1 hour.
Recently the Product Developement team brought us some new steel grade for testing. The given temperature is rather low, and also a longer cycle. I dont think they really calculated the annealling cycle for some reasons. So, is there actually anyway to calculate the best temperature?
Thanks..





RE: Recrystallization temperature for annealing
Just to be clear, are you referring to recrystallization annealing or a full anneal?
Recrystallization annealing is performed by holding material below the lower critical transformation temperature Ae1 for some period of time. The recrystallization temperature is dependent on prior processing (cold working). I have not seen an empirical equation to estimate this temperature other than by experimentation.
To predict the actual austenitizing temperature of steel for full annealing, there are several empirical equations that are based on the chemical composition of the steel. An example of one equation is below to calculate the minimum value of Ae3;
For 0.3-0.6%C low alloy steel
Ae3 (deg C) = 854-179C-13.9Mn-17.8Cu-1.7Ni+44.4Si
(Elements are in weight percent amounts)
RE: Recrystallization temperature for annealing
This gets real spooky with some microallyed grades since they have all sorts of critical temperature rnages that you need to avoid.
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Rust never sleeps
Neither should your protection
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RE: Recrystallization temperature for annealing
Why is so important that the annealing time be calculated if you can directly measure the material condition? What condition do you want to test the material in? Fully annealed? If you arn't sure if the material is fully annealed condition ask your development dept. to provide you with samples annealed at different times. Doing a Vickers test at those different times. If the hardness starts to flatten. You can be sure that the material is fully annealed.
Matlsguy
RE: Recrystallization temperature for annealing
The material,4ft wide x 20mt flat product coil, is going through recrystallization annealing. The importance of annealing time is because it will greatly affect our production output, approximately 100mt/hr.
RE: Recrystallization temperature for annealing
RE: Recrystallization temperature for annealing
the process is a batch annealing of coils. currently we have SPCC-1C coils to heat-treat. it was found that the quality was too good after annealing; required was CQ, but we've achieved DDQ. Ofcourse, we did this is a relatively high temperature, slow heating, and long cooling hours; with additional furnace cooling.
RE: Recrystallization temperature for annealing
RE: Recrystallization temperature for annealing
An issue with batch anneal of coils is that the heat transfer within the coil is dependenent on how tightly the coil is wound. A coil that is not very tight will not heat like a tight one.
= = = = = = = = = = = = = = = = = = = =
Rust never sleeps
Neither should your protection
http://www.trent-tube.com/contact/Tech_Assist.cfm
RE: Recrystallization temperature for annealing
Nick
I love materials science!
RE: Recrystallization temperature for annealing