I thought some might find this interesting. I had tried several times to find out what this steel is, and finally was able get an answer from Dictum.
It’s a Japanese steel designated KA70
C: 0.65~0.75
Si: 0.15~0.30
Mn: 0.6~0.9
P: ≤0.03
S: ≤0.03
Cr:≤0.15
V: 0.1~0.2
I haven’t found almost any info on this steel, but it seems like it will be quite tough.
It’s a Japanese steel designated KA70
C: 0.65~0.75
Si: 0.15~0.30
Mn: 0.6~0.9
P: ≤0.03
S: ≤0.03
Cr:≤0.15
V: 0.1~0.2
I haven’t found almost any info on this steel, but it seems like it will be quite tough.