Metal identification by using a file.
Low-carbon steel (mild steel) - No resistance, the file bites into the metal.
Medium-carbon steel - Little resistance, the file bites into the metal, but the pressure has to be increased.
High-alloy steel - Medium resistance. The file does not bite into the metal and the pressure has to be increased.
High-carbon steel - High resistance. The metal can be filed, but with difficulty.
Tool steel - High resistance. The file leaves marks, but the metal is almost as hard as the file.
Hardened tool steel - High resistance. The metal is harder than the file; the file does not grip.



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