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Reply by crank49

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Posted on Lawn mower blade as tool steel?

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crank49

4023 posts in 2785 days


#1 posted 06-19-2013 07:19 PM

My former employer makes cast alloy iron with a hardness that surpasses most tool steel, Rc 62 to 65 but is used in blow bars and hammers for hammer mills. These wear parts are designed for extreme hardness and impact resistance. Hardness does not directly relate to toughness and impact resistance.

Also, generally stainless steel is softer than even mild steel, with the exception of the 400 series. And the 400 series, although it can be hardened to Rc 60 or so, is a nightmare to sharpen.

Anyway, the blades of a rotary mower are designed for toughness and not necessarily hardness, as was already stated. But, it is possible they could be hardened by heat treating.


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