It can be 4-500 BHN and still take a licking and eat up cutters.

I cut Abrasion resistant steel for a business. AR-400. It is easier
to grind than the good blade.

I bought a set of blades that didn't have a hole but a cloverleaf
to mount it. I'll have to grind it - but that won't be true to center.

So the steel will be used to harden surface needs.

You might have cheap blades that are not keeping an edge long.

I have a 54" triple blade mower myself.

Martin

Martin H. Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
"Our Republic and the Press will Rise or Fall Together": Joseph Pulitzer
TSRA: Endowed; NRA LOH & Patron Member, Golden Eagle, Patriot's Medal.
NRA Second Amendment Task Force Charter Charter Founder
IHMSA and NRA Metallic Silhouette maker & member. http://lufkinced.com/

On 5/26/2010 8:57 PM, Lloyd E. Sponenburgh wrote:
"Martin H. fired this volley in
:


I want to put mine on my surface grinder.

A mill - the blade is to hard for milling.


Horse ****, Martin. Lawnmower blades are deliberately made on the soft-
temper side to prevent them from shattering upon hitting hard objects.

I don't get it: A whole bunch of "metal" guys telling me that a tool
designed to hit concrete at 270MPH without breaking is also too hard to
cut with ordinary milling bits...

sigh

Of all the crap (I _mean_ crap) I've gotten from this post, there have
only been two constructive posts; both from guys who seldom post, but who
obviously read before they do.

The rest of the "experts" have decided that 1) the manufacturers of mower
blades don't know what they're doing, and 2) tools don't exist to mill
medium temper carbon steel.

I guess it give me a perspective on the guys who respond vs. the guys who
actually do metalwork.

LLoyd