Excuse me if I seem rude - I'm not meaning to be - but I have to ask why you even bother with that crap? S&W, SWAT, Taylor, Frost, M-Tech, etc. You're already aware the steel is of low quality, and on top of that you know the heat treat is questionable.
I don't bother with them anymore as these were all knives I've bought long ago. S&W knives are mostly pretty good for their low prices. My old Homeland Security takes and keeps a good edge, batons with no problem and out of the box that huge, crowbar of a knife sliced paper into ribbons. Even after hard use the camo finish has virtually no wear, and the blade sharpens back up to a very nice edge. As a camp knife it's a bit uncomfortable in the hand, but it cuts as well as much more expensive knives, and it won't break, period! In fact, I love my 440C knives.
Another S&W 440C knife I've liked enough to toss into my tool kit is their cameo PowerGlide. It's unique design is very strong and while nothing to write home about, the blade sharpens to a fine edge and it holds the edge about as well as some of my more expensive knives. Even the case that came with the PowerGlide is a perfect fit for my old Cold Steel Gunsite II (which is still my EDC to this day). After carrying that 5-inch blade Gunsite since 2006, the PowerGlide case is still going strong. I've worn out two pairs of jeans and am working on my third. The case also fits my 5-inch CS Voyager, which I sometimes swap with my Gunsite. The PowerGlide itself has a solid design that's strong enough to be included in my tool kit. It's sharp enough to strip wire, but it's totally lacking in charm. Still, sometimes a knife is a knife.
I've also found a S&W HRT boot knife in my box and a CK6A ExtremeOps, both with 440C blades. These are cheap knives I've not found uses for. I've never thought buying a boot knife with good steel made a lot of sense. It's not a knife that will find a lot of use. Boot knives tend to stay hidden until used, which means they only need to be sharp enough for a single use. That's why Cold Steel initially used 420 in the blades of its OSS other double- and single-edged combat knives. Lyn Thompson figured that fighting knives didn't need to be made with higher grade steels, but had so many people asking for a better steel that he subsequently switched to AUS8A. I have some of the knives in both steels, and the blades of both are extremely sharp. And though I have no doubt the AUS8A blades will hold their edges better than the 420, I've never tested them. They're both sharp enough for their intended purpose.
The bottom line is that I see no real need for having cheap, liner-lock knife designs. Most is us have a box, or boxes, of cheap knives we got years ago when we were first getting into knives, or knives given to us. I've got such a box and only carry the cheap knives when I'm going into cities where the legality is such that I may have to ditch them if going into a museum where there are metal detectors. Or if I'm going to use a knife so hard it may result in its destruction. Most of the time I use my Gunsite II and it's held up very well. As I type this, I've got a Cold Steel Frenzy coming and I expect that to be my new EDC knife. I'll then retire my Gunsite and look for a new sheath.