Danfoss / Eaton WEAR Plate

Carbon steel construction, so it's built to take the kind of friction and load that piston pumps put out during regular operation. That material choice keeps it from degrading quickly under the mechanical stress that builds up between moving components. For a working pump setup, that's exactly the kind of part you want in there.

You bet, it's made from carbon steel. It's meant to hold up in demanding environments.