i wrote this somewhere
HSS Can be soft or hard. HSS is made by the addition to materials such as tungsten (14-20%), molybdenum (6-9%) and chromium (1-6%) to molten carbon steel, the different percentages depend on whether the HSS is hard or soft/flexible, these blades also help when grinding as they have no need to be cooled, because these blades are made to cut faster and withstand more heat.
cobalt is also added in some blades, in my opinion they are excellent pick making blades, no bending at all