12-20-2015, 07:10 PM
Anyone reading the above will be utterly confused. 
Normalizing, annealing and hardening of steels the temperature has to go above the Upper Critical Point.
Tempering, the temperature has to be below the Lower Critical Point.
One cannot temper annealed steel, there has to be some hardness to be able to temper it.
Any cutting of some steels can and does harden it, includes grinding - just smaller chips. So it can be tempered to remove some of the hardness and some stress.
I think to fully understand it all one has to look at the different structures of steels and how temperatures can affect it.
DaveH
Normalizing, annealing and hardening of steels the temperature has to go above the Upper Critical Point.
Tempering, the temperature has to be below the Lower Critical Point.
One cannot temper annealed steel, there has to be some hardness to be able to temper it.
Any cutting of some steels can and does harden it, includes grinding - just smaller chips. So it can be tempered to remove some of the hardness and some stress.
I think to fully understand it all one has to look at the different structures of steels and how temperatures can affect it.
DaveH
a child of the 60's and 50's and a bit of the 40's 