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Which surface is the best for metallographic grinding of steel?

Parallel surfaces are best.

The parallel surface of steel parts is relatively flat and easy to grind, which can ensure the flatness and accuracy of grinding. However, metallographic analysis needs to observe and analyze the microstructure of the material, and the flat surface energy can show the microstructure of the material more accurately, which is conducive to obtaining accurate metallographic analysis results. Therefore, this surface of steel is the best choice in metallographic grinding.