Your view downstairs is a little one-sided. Besides, even if corundum is chosen, white corundum is better than brown corundum. 7Cr 17 belongs to special high-carbon alloy steel, (white corundum WA(GB) contains 97~99% alumina. White, higher hardness than brown corundum, lower toughness, better self-sharpening, less heat when grinding, fine grinding hardened steel, high carbon steel, high speed steel and thin-walled parts).
When grinding, the particle size is divided into coarse grinding and fine grinding, instead of randomly selecting 46 particles, right?
You haven't had much contact with diamond CBN grinding wheels, have you? Many people with large requirements and high production efficiency will consider using it. What you said is not easy to use, but you can't use it. The use of diamond (or CBN) grinding wheel is closely related to the choice of binder, grinding linear speed and rotating speed. If you can't adjust the parameters, even the best grinding wheel will be rejected.
Reasons for rapid wear: The hardness of abrasive particles is 2-4 times higher than that of steel during grinding, otherwise it is easy to lose cutting ability due to passivation. The reason why silicon carbide wears fast may also be that silicon carbide reacts with steel under the catalysis of the temperature and force of the grinding fluid you use. In a word, grinding seems simple, but it is also a science.