kdleung said:
What is the benefits of S30V compared to D2 for a folder?
Here's my best guess: S30V has better corrosion resistance than D2. That resistance comes into play moreso in a folder than on a fixed blade knife. With the folder, there are all those little nooks, crannies, and mating metal parts where moisture can condense or collect and start the metal rusting. On a fixed blade, you need only worry about the handle to tang/guard junctions for moisture penetration.
As a $0.02 aside, I own only one S30V knife so far. It is a Blade-Tech Wegner Pro Hunter folder. It has impressed me greatly with its performance and, especially, edge retention. I've been abusing it pretty well lately tearing down lots of cardboard, prying staples out of boxes with it, cutting paper, using it as my job-site knife (stripping electric wire insulation, striking cut-lines on wood, shaving wood parts to fit, scraping paint off screwheads), plus using it at lunchtime to slice up acidic foods like pickles and tomatoes.
There are mini-chips near the tip and the edge definitely won't shave hair. Sharpening it is defined as a few licks on a Spydie Sharpmaker when I think of it.

However, the blade seems to continue cutting okay, even when it doesn't feel particularly sharp to the touch. If all S30V blades work this well, I can understand the affection the steel gets from the knife-knuts of the world.
Given that much of a steel's performance can come from the heat treat it receives and Busse/SRKW's obsession with the heat treat aspect of knifemaking, I expect that the S30V blade on the Rat Trap Folder (RTF) will be a screamin' demon of a cutter. Which is good news for us Rats!!
