Catching the temp, on the way down?

A laser gun pyrometer is not particularly accurate for HT. When you take the steel out of the forge, it cools on the surface quickly. The reading will be much lower than reading the core temp of the steel. I have never seen a gun pyrometer that is accurate at forge temps for less than several hundred dollars.The HF units are fine for checking the quench tank temp,or tempering temps, but won't be good at 1500-2000F.

A properly set up digital pyrometer with a sheathed thermocouple can be had for less than $75 (ebay parts). A few bucks more for a solenoid valve and the forge can be set to run at an exact temperature. Search the many posts on this subject.

The probe needs to be in the forge chamber and not directly in the flame.Many forges can run at +/- 5F at austenitizing temps.
Stacy
 
Thank's Stacy,
Just to let you know I went back to "Tempering Talk" a post from awhile back. What you and Kevin discussed there also helped out alot. Another must read for anyone wanting to push the envelope and do the very best that they can.
I will look into the parts you sugested, and will probably drive you nuts with the next series of questions.
Thanks again for clearing up this long nagging problem of mine. Larry.
 
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