"Ignoramus31693" wrote in message
...
I woud like to ask a question.

Why would anyone want to harden lawnmower blades? They are meant to
cut very soft material (grass) by hitting it at high speed and
splitting the stems. Hardnedd of the blade is irrelevant to grass
cutting performance.

Hardening would not help much wrt dulling of blades when they hit
rocks and soil at high speed. Rocks will be harder than the blade
anyway and wil dull it regardless of hardening.

The primary reason is to reduce wear from sand. Sand is almost always
lifted from most soils during mowing, and drastically reduces the life of
the blades -- especially the "lift wings".

LLoyd