My lady drags me to thrift shops all the time so I usually just look through all the kitchen knives. I've found some nice German and Japanese chef knifes and others. I learned on my paper wheels by sharpening these.
Of course you'll be able to work up a burr faster on softer or less durable steels compared to m390 or similar. As long as you realize this before hand it helps build muscle memory doing "junk" knives. Hell, you could just take a file to it and start over to practice different bevel angles.
That's a good point about thrift shop or garage sale kitchen knives - while I don't collect any kitchen knives, such knives with half-way decent steel should make good practice knives.
I do intend to simply file them back to butter knife sharpness and starting over, as I try to go up the learning curve for sharpening.
I've now tried to sharpen the $1 Walmart kitchen knives, and did learn a little more about maintaining a consistent angle and width for the edge. However, the steel almost seems like aluminum since it is so soft. However, as was mentioned by someone in this thread, I might be able to learn a little about polishing the edge - it's at least worth a try.
Does anyone think so poorly of 8Cr13MoV steel that they would recommend *not* learning to sharpen knives at the novice level with this? I have looked at the Enlan Bee L05-1 knife, which supposedly features this steel for less than $13 (including free Prime shipping) on Amazon. I wondered if it would be suitable for sharpening practice even though it's long been surpassed by newer high-tech steels. I guess it's a matter of trial and error but for this amount of money I'm willing to gamble. Like practically every other knife I've looked at, they claim 58-60 HRC.
Thanks for the link to a very long bladeforums thread on Ganzo/Enlan/Bee/Sanrenmu knives - it was helpful to review that thread for my throwaway knife sharpening practice purposes.
Finally, it's occurred to me that I really only need a knife *blade* for sharpening practice in my Lansky system (I''m expecting to acquire an Edge Pro or Wicked Edge system later this year). Thus, it doesn't matter to me if it's a fixed blade or a folder since it's just going to be clamped in a blade clamp/vise, sharpened, filed to no edge and then resharpened. I wonder if a cheap naked knife blade would be any cheaper or otherwise better than buying a cheap complete Ganzo etc knife? If so, does anyone know of a good source for cheap knife blades made of somewhat higher quality steels? I suppose I don't necessarily need an edge on a practice knife blade, but I do need to have the complete blade shape - a rectangular knife steel blank won't be of use to me!
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Since I am also trying to build a small collection of decent quality (or better) knives, studying really cheap knives is distressing to me, and I have to remind myself that I'm not intentionally collecting such knives! Having said that, I am surprised at the fit and finish and ergos of $15-20 Chinese branded knives - my Benchmade Grip 551 is not 5x the quality, but it is about 5X the price of my Ganzo sharpening practice knives - almost everything material in this life works that way, I guess. After a certain price, getting even a little more quality takes a lot more money.
Thanks to everyone for all the helpful comments.