Not sure about yours but I have a couple of pieces a friend gave me, some kind of high speed steel cutter blades, I tried everything I knew to get it soft to work and never could.A friend in the club that is a machinist told me that some steel depending on the alloy it was made of, was designed where heat wouldn't effect it and that you would never get it soft, all I know for you to do is give it a try and see if it will soften so you can work it.
Pappy