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What type of coating to adopt according to the type of material to be broached?

Depending on the type of material to be machined, coatings can be applied to the broaches to improve their durability in terms of number of work-pieces produced, such as HDP RED (STAR 4), WONDER, INOX PLUS and TIN.
Here are some examples of materials to be machined with the graphs highlighting the difference between the tool made of normal HSS and the coated HSS tool.