Only 1982 and after Lincoln cents are copper plated. There are 95% copper 82's (US Mint switched over to zinc in 82) but that's a whole different story.
That is the normal weight for a 1946 Copper alloy cent. It has either been plated or something done to the metal to turn it that color. Most likely plated.
If it were steel, it would have a strong attachment to a magnet. If not, then it would be a weak attraction to a magnet. I'm thinking it is plated/zinc coated, but check it to see if it has a strong of attraction to a magnet like a 1943 steel cent. If not, then the coin was altered.
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