Never heard of that if you want some tough blades spend the coin on Gator G5 or G6 with Fusion(TM) - an ultra-hard tungsten carbide layerAnybody ever weld hardened abrasion resistant filler rod across a mower blade? Seems like it would be somewhat self sharpening.
I live in pure river bottom sand and it eats blades. I switched to some of those after the first season they didn't even need sharpened. Very impressed with them.