I am making a knife from old rusty file , using Scraper tool that I make from the same file . It shows that we can make the same steel - very hard or very soft with the right heat treatment.
Check out TSPROF sharpening systems:
For U.S. customers:
https://tsprof.us/?ref=rkkbcuyu
For European customers:
https://www.tsprof.eu/?ref=RUSTLEGION
-5% cupon code: RUSTLEGION