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hope this might help as well: if your metal is flat, it won't reflect much - or too much of what you don't want. So this is assuming the metal is flat on at the camera:
insert an image plane with an ordinary parametric image on it, like a blurred scene/landscape/roomscene or something. Put the plane behind the camera, so the camera is in FRONT of the plane and pointing at your object. The image on the plane should reflect back into your metal object.
Now if you point a spotlight directly at the plane from somewhere in front of the camera you can control the strength of it.
That way you can use a white background (or black) because the light is reflecting back from your metal object.
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