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Put a metal (steel) coat hanger on an anvil and tap it with a hammer. Flattens? If it does, it is "malleable" and then steel is malleable. Be careful with your definitions.
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I'm sure you would say the same thing if I used the word DUCTILE or even the term PLASTIC DEFORMATION.
I could say use a magnet but then that would be negated by some types of stainless steel.
So where do you want to draw the line?
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Back to the subject, If you get plastic covered metal; you have steel for sure as the manufacturers of non lead wheel weights are not currently covering zinc with plastic.
Pure Zinc has a melting point of just under 790 degrees. It goes into the 8's depending on the impurities or alloying materials.