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Depending on the source, eutectoid is defined somewhere between 0.74 and 0.85 percent carbon in a plain carbon steel. I have used the upper limit over time with predictable results. Carbon, major...

Superquench solution has been discussed. And I specifically used 1030 steel as an example because that is the material track spikes are made from.

I would encourage you to continue to think about the problem. As often happens, breakthroughs occur because the status quo argues that nothing new is left to be discovered. On the other hand, you...

But you are taking observations and learning from them. I am fascinated by the fact that so many "good" blades have been made without the makers having the benefits of the education available to us....

More or less, with some debate, this is true. Watch: https://www.youtube.com/watch?v=viqrOAG13Q0 This is a much larger blade than a razor but the same forces are at work. There is a lot of...

I returned to the Dovo video and they are using molten lead to austenitize the blades and quench in oil. The oil is probably warmed and that means marquenching.

The shock to the steel is...

You ask good questions Vasilis. And DrDalton has succinctly answered, and well. I'll buy you both a beer any time.

Lead baths are still used by Dovo if I watched that manufacturing video...