What is the hardest blade steel?

Related questions

1. What is Brinell hardness number?
2. What is the unit of Rockwell hardness?
3. What is unit of hardness?
4. What is the hardest steel for knives?
5. How do you calculate Brinell hardness?
6. What is the toughest steel?
7. Is Damascus steel strong?
8. Is Damascus steel better than stainless?
9. What is the hardness of plastic?
10. What is difference between HRC and HRB?

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