Some shrinking can occur with only room temperature cooling but is greatly accelerated and multiplied by cooling with either compressed air or water squirt bottle or rag but water generally tends to provide quicker cooling.
How to shrink stainless steel sheet metal.
Here s a technique that was often used years ago and is still used today of how to shrink metal on a body panel after it has been damaged and stretched.
Heating up metal and throwing cold water on it may shrink it a tiny bit but it makes distortion and hard steel.
Before you start working the precious metal on your hot rod try heating and hammering some scrap metal.
If you have access to a bead roller roll yourself a bead and shrink it.
Do not over heat the steel.
It s ideal when lots of shrinking needs to be done and you don t have access to a machine.
Heat to blue only and shrink that much.
These shrinking discs work well on steel stainless aluminum brass and may on some other metals.
This works the other doesn t.
Get an idea of how.