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Oh nice. They are still heat treated if I'm not mistaken, so just about everything stands, including carbon content. It's just tungsten rather than iron. In fact white cast iron is called iron carbide, and is used for its hardness as well. The wear part on train wheels for example.

I don't know much about grinder teeth, but i know a bit about steel. The harder steel is, the more brittle it is, and the more carbon it has. The less carbon, the tougher it is, but is more malleable so it will dull quicker. Exactly what Carl said. When dealing with hardened steel, it is almost...