What is the toughest steel?

Related questions

1. What is HBW hardness?
2. What does HRC 1 mean?
3. What does Brinell hardness number mean?
4. What is the hardest blade steel?
5. How do you calculate hardness of a material?
6. What metal is harder than tungsten?
7. What is unit of hardness?
8. What is the hardest steel for knives?
9. Is Damascus steel better than stainless?
10. What is the principle of Rockwell hardness test?

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