The Rui High Speed Steel Nakiri is the king of vegetables. At 67 HRC, this is one of the most long lasting edges on the market. At this price point, there is no competition in terms of hardness. 

*It is important to note that HSS is not a stainless steel, like Japanese high carbon steels, you will need to take care of it by wiping it dry everytime after use and put in dry place to prevent rust. However, if rust does occur, simply garb a sandpaper and grind them off.