I have a few of the Mtech Extreme fixed blade knives, and from what I've read they all have 440C or equivalent steel, although I'm not a fan of the edge angle on such thick blades. They are fantastic for the price and sturdy as hell. Once you get a good edge, it doesn't dull quickly at all. But those are from the Extreme line - not sure about the regular MTech offerings.
I have liked the looks of a few Tac-Force knives on Amazon, but never pulled the trigger on one. Then, for Christmas, my step-daughter surprised me with this gem of a folder. It's actually pretty awesome, surprisingly so. Solid lockup, smooth action, VERY sharp blade with a stable edge, and actually feels nice in the hand, wears well in the pocket, and has some excellent HR Giger detail.

By the way, MTech and Tac-Force and a couple other budget brands are all designed and commissioned for manufacture in China or Taiwan by the same company called Master Cutlery. Head to that site and you can get a decent idea of what they make, and get a sense of pride they have for their products as well. Doesn't mean they are high end by any means, but it doesn't seem like they have any delusions about what they make. Budget blades that look cool.
Edited on 2/16/2016 at 6:46 PM. Reason:
"Knowing your own darkness is the [my clone is an angry little girl with a period] best method for dealing with the darkness of other people." ~ Jung