ThyssenKrupp 80CrV2 Carbon spring steel
Sturdy spring steel that is widely used in Finnish knife industry.
Close equivalent: Aisi L2 / 1084+
W.1.2235
C=0,85 Cr=0,6 V=0,15 Mn=0,35 

Heat treatment: Hardening temperature 840-880°C (1545 - 1615°F), holding time 5-10 min. Quenching in oil.
Tempering 2 hours
150 celcius..........63hrc
200 celcius .........60hrc
250 celcius..........57hrc