All of my points still stand.
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Originally Posted by
Teacher 
No, that's not right. First, it's called a steel; hone is the verb. Second, the coarseness has nothing to do with it. It's how hard the steel is. A steel must be a few degrees Rockwell harder than the edge it is honing or it won't work. The only time a steel need be basically smooth is when it is used for a card scraper.
Thank you for the English lesson, everything else I wrote is still correct. Coarse or even medium steels that come with most german knife sets will cause micro-serrations to be formed on the knife when used with a heavy hand. It's like taking a coarse file to your knife. After spending the effort polishing the edge of my knives on progressively finer stones, I certainly would not want to serrate and weaken the edge with a coarse steel. A smooth steel will gently straighten the edge, while a ceramic honing rod will remove some weaked metal from the edge while pushing it back into alignment. "When a typical German knife encounters a kitchen counter, a bone or something else hard it tends to roll it's edge."
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Originally Posted by
Teacher 
This happens to all steel edges, not just German ones. That's what the steel is for.
Just like I said, harder steel tends to chip instead of rolling. "Japanese made western style knives are lighter, have a thinner edge profile, made with better, higher carbon content steel, and are hardened to a higher RC number for superior edge retention."
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Originally Posted by
Teacher 
Uh...no. It is certainly not better; it is different. Nowadays, it is not always higher in carbon, but often chromium and/or molybdenum. (Japanese chisel edges, on the other hand, are higher in carbon.) Besides, as I've brought up more than once, higher carbon content always has one glaringly negative side effect: brittle edges. That's why modern Western edge steels actually have lower carbon contents than edge steels of old. And yes, it is hardened more, but your use of the word "superior" needs qualification. If you mean that it it will take more soft-use wear and tear, then yes, it is superior. If you are talking about hard abuse, however, it is most definitely inferior to Western steels, which are far less brittle.
I was expecting you to pick nits with my "better" comment. They are better for the type of knives that are designed to offer maximum cutting performance. They are better because they can take a thinner, more acute edge and keep it. They are better because they often use steels that are designed from the ground up as knife steels by the manufacturer as opposed to kitchen sink steels adopted to knife use. Modern powder steel manufacturing technologies are able to create steel alloys with compositions that were not possible before. For example, Hitachi offers ZDP-189 steel that combines 3% carbon and 20% chromium with other metals. ZDP-189 is able to be hardened to RC65-67 and is stain resistant. If I need something for hard abuse I would use my Busse knives, which would chop through rocks, refridgerators and compact cars.
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Originally Posted by
Teacher 
Each alloy has its strengths and weaknesses, and one should know what they are when going into knife buying. Just because something is harder does not make it overall superior. There are pros and cons to each aspect. For example, would you recommend making kitchen knives from S53 steel? Hard and tough as it is, I would never, ever recommend such a thing. It just has too many drawbacks for the home cook.
Yes, obviously different alloys have their strength and weaknesses, which is why alloys specifically designed for high performance cutlery are better for that purpose. No knife manufacturer or custom designer I know of makes knives with s53 steel at least currently, but it appears S53 has only recenlty relased. Even though S53 is designed for high-strengh aerospace applications, I would not be surprised if some manufacturer offered pocket knives made from it in some point in the future. Knife geeks need "the next greatest thing" to keep them interested.