I never figured there would be stainless steels that didn't stick to a magnet. No titanium badge for me just yet. Thanks for the insight, Andrii and Nate!
Ordinary food stainless steel 304/314/316 has a low carbon content. its non magnetic. It cannot harden but it welds well, so we use it to design various metal structures, conveyors, etc.
However, because of this it is soft. Its hardness does not exceed 5-10 HRC - Rockwell units.
Steel 420, 440c is hardened due to its high carbon content and we achieve the required hardness in our tools.
For example screwdrivers and wrenches, key chains and pry bars are 40-45 HRC. Knives, axes and loaded products are 52-55 HRC.