I'm going to make an offbeat suggestion, but first here's the logic:
Since I retired from my day job as an aerospace engineer 5 years ago I took up knife making as a hobby.
After exploring numerous designs and every knife steel known to modern science, I came to one startling conclusion that is probably the same
conclusion that every knife maker comes to: it's all about the steel. It takes almost as much effort to make a blade out of crappy steel as it does
to make it out of good steel, so why not go for the good stuff?
Ah, but what is the good stuff, you ask? I knew you would ask that. The answer depends on what you intend to use the blade for and how you plan to
sharpen it. If you need a blade to cut through sheetrock or open sacks of cement, you should probably go to the local convenience store and buy one
of those 2 dollar pocket knives out of the jar, because it's not going to last long under any circumstances and you don't need a particularly good
edge to begin with.
In this case, however, your wife is an accomplished cook, presumably takes pride in her work, and wants to do at least a semi-professional job. She
needs blades that are going to have dependably keen edges whenever she picks them up. She's going to want to be able to pick up a knife and slice
tomatoes paper thin, dice onions and pare vegetables without a dull blade turning them to mush. She probably isn't going to want to continually be
fighting rust and discoloration which is always likely if you use straight carbon steel around water. In my experience, there are two ways to achieve
that. You can get conventional culinary stainless steel blades from one of the standards like Henckels, or Wusthof, in which case she will be
continuously straightening the edge with a diamond or steel hone and frequently touching it up on sharpening stones of some kind. Or, you can get
knives with a better blade steel in which case, they will hold their edges much longer, and straightening and sharpening will be relatively
infrequent. The knives will be much more likely to have a keen edge whenever she picks it up.
The major brands like Henckels and Wusthof use proprietary stainless steels that are a compromise between sharpness and rust resistance. They're
highly rust resistant but end up having a hardness somewhere around 56 on the Rockwell C scale. In culinary applications you've generally not cutting
through anything abrasive, so the main factor that causes a blade to lose its keen edge is not the metal wearing away, but the cutting edge bending
under the pressure of cutting or running into hard materials like bones or the cutting board. That will make the edge wavy or bent over into what's
called a "wire" edge. Straightening out those bends is the main purpose of a sharpening steel.
It has been my experience that as soon as the blade steel hits a Rockwell hardness of 60 or above, magic happens. All the problems of wire edges go
away. Wire edges don't form when you first sharpen the blade and they don't happen during normal use. If you do have to resharpen the edge to remove
nicks, etc. you will probably want to use diamond stones.
Henckels has a super steel called CERMAX that they offer in their high end knives that achieves this level of hardness, but they are hideously
expensive.
A relatively obscure Japanese company called MAC knives offers a series of professional knives in both Japanese styles as well as classic European
styles at prices that are competitive with the common German brands. They use a proprietary steel alloy that is reasonably rust resistant but has
very good toughness and hardness. They typically come in around 60+ on the Rockwell C scale, so the edges don't bend or roll over. They also use a
15 degree angle edge grind instead of the more common 20 degree grind. That makes them slice much more easily through foods. Unless you live in an
area that has Japanese supermarkets, you will probably have to order them online.
You might want to get one and try it out.
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IAMTAT