Rule of thumb. Steel loses 1/2 of its strength at 1000*F.
You’re not gonna use MY THUMB to check that temperature. 🤪
[Completely off topic. I found this by accident, on an iPhone if you hold the 0 (zero) key for a second then it offers the ° symbol. Don’t know about on Android.]
On a keyboard the ° degree symbol is ALT + 248 by using the Alt key+ the decimal code on the numeric keypad (note that the numbers across the top of your keyboard do not work for this)
Also available in the dropdown or popup SYMBOL CHART in Word Processing software.