I checked out Phil Hartsfield's bio on wikipedia and it says he differentially edge hardened his knives. Here's the link. https://en.wikipedia.org/wiki/Phill_Hartsfield Now, I think he used mostly A2, which is an air cooled steel. I'm wondering how or if it's true that he differentially hardened A2. I thought that it was near impossible to differentially heat treat air cooled A2?
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Phil Hartsfield
- Thread starter GrReaper
- Start date
- Joined
- Feb 17, 2009
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- 7,310
Many have said they can do it, still waiting for them to produce a hamon on A2
He was pretty tight lipped but there was a video on swords were he mentioned using metal heat sinks in his heat treatment.
There was only 1 to 2 points difference from the spine to the edge.
One thing that can be seen is he did not use foil wrap on his blade.
He was pretty tight lipped but there was a video on swords were he mentioned using metal heat sinks in his heat treatment.
There was only 1 to 2 points difference from the spine to the edge.
One thing that can be seen is he did not use foil wrap on his blade.
