Mystery metal

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I repaired a post driver for a guy that was all beat to hell awhile back. Its 3 pt hitch and goes behind a tractor. I had to put some new bushings in the plate the top link on the tractor attaches to. So cut the old ones out with a torch. Left side, no problem. Right side, will not cut with torch. I dont recall how i got it out, but my point here is it was made of mild steel, except for that one plate. It welded to mild steel but did not have the same properties. Im just curious what it was/is and if anyone would have an idea. Not the best picture its off a website. Attached Images
Reply:It might have been martinsitic steel.
Reply:Probably some kind of stainless steel.
Reply:The driver is factory made, i was just trying to figure out how the hell part of it isn't mild steel. And the grinding sparks weren't the same. If i remember correctly there really weren't any off the odd piece.
Reply:maybe ask the mfr...
Reply:I know some bushings are hardened for improved wear resistance.  Perhaps this manufacturer is switching to stainless (or something else) for similar reasons.  Maybe you got one of the transition units...
Reply:when you cut it with the torch what does it do?WELD TO LIVE LIVE TO RIDEA bad welder blames his equipment, a good weldor can lay a perfect bead on any thing
Reply:It would not cut with a torch. turned red, hit the oxygen and... nothing. More preheat, still nothing. I thought i was running out of oxygen so i used another torch. Nope same thing. Pretty odd to me!
Reply:did you put a magnet to that side
Reply:Sounds like stainless to me, man.  Very little sparks when grinding, and cant cut with a torch.  Thats either stainless or NICU, but there's no practical reason for using NICU on a tractor bushing, so it was most likely stainless.  If you run into that again, just use a plasma torch.  Or like the other guy said, test it by seeing if a magnet will stick to it."Real power is an arcair hand torch with a piece of 3/4 inch carbon and 1500 amps.  You feel like Zeus throwing a lightning bolt."