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The resulting 'ting' or 'click' would probably be the most gutwrenching sound you'd ever hear :)

They will probably not chip due to having a wide bevel angle and absence of a hollow grind. And even then they will probably chip if used incorrectly, where a 'softer' knife will be more forgiving.

Tamahagane is not necessarily harder. It all depends on the heat treatment. For a katana I thought the rule of thumb was 60-40. 60 HRC for the cutting edge and 40 for the spine.

67 would be...