Yes, they do. The real grab bag on these chisels (it looks like someone sold a machine that makes the blade style automatically, as they're all over the place on alibaba from different regions) is what drill rod they use (most are cr60v which can probably make an OK chisel when helped by the buffer - these may be that). Once in a while, I see CrV100 (which would be 1% drill rod) advertised as being in chisels, but two things:
1) they're always overpriced
2) I don't trust them that they're actually 1% drill rod
Cr100V should make (not sure of the order of the letters and numbers) should make an ideal chisel - Cr adds some hardenability, vanadium pins grain size small and increases peak hardness, and 1% carbon would make for good fine edge holding.
If someone sets these machines right, they should make consistent chisels (them being, my guess, two induction heating stages and a splash after each. Chromium (and maybe vanadium) aid in allowing good hardness with something less than a huge full quench.
Aldi's chisels are also variable. I've seen claims that some are over 60 hardness, and some are definitely not.
But there's nothing in a chisel that really adds cost aside from expensive stock (A2 isn't cheap and V11 is, at least from what's probably the original company, extremely expensive) and milling/finishing costs. V11 commercially heat treated would spend some furnace time, but so does A2. In my opinion, A2 is a bad choice for chisels, and it will lose chunks out of the edge to some stones. V11 is pretty good, but what it has over a carbon steel is a negative for chisels unless some of you folks can't keep your chisels from rusting.
