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What is this heat treat process?


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Starting about 4:30 they begin heat treating blades. The process appears to be edge heat, oil quench, dual hammer, scrape edge, straighten, scrape, final cool in water.

 

The hammering right after the oil quench has me confused. They hammer both sides without really looking for straightness so I'm not SURE if this is a straightening procedure or what. What's your take? Why are they double hammering both sides after the edge quench?

 

https://www.youtube.com/watch?v=gNeJQvooxAk&t=66s

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I think that's all it is, they're only hammering the unhardened spine.  They may also be straightening the edge top-to-bottom.  Dude is checking for straightness, he just does it so fast it's hard to see.  That's what I see there, anyway.  Similar to how the Japanese do it with san mai.

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Ditto what Alan said. 

That video also shows you how small the tang can be compared to the blade size.

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