My visit to a traditional forge in Kyoto changed how I handle hot metal

They keep a wet clay slurry nearby for cooling specific areas. This way, you can temper just the part you need without dunking everything.

2 comments

2 Comments

sage2041d ago

Whoa, that's a cool method but honestly it seems risky. Wet clay can trap steam against the metal and cause hidden cracks. I've always had better results just using a directed air blast for spot cooling, way more control.

the_piper1d ago

Remember that risk with wet clay? A friend of mine learned the hard way. He used it to cool a knife blade unevenly. The steam pocketed and left a crack he only saw after polishing. Thing snapped during a stress test. Air blast is definitely safer.