How about high speed steel knife for key slot

The keyway is generally better than high-speed steel, because high-speed steel has the advantages of high bending strength, good impact toughness, good machinability and grinding processability.
High-speed steel can be divided into general high-speed steel and special-purpose high-speed steel according to the application. Therefore, according to the nature of the workpiece material during processing, it is better to select a suitable high-speed steel.

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