False.

Sterling silver is made of silver and copper, pewter is silver and lead.
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False.
I'll go for true. The early SSs, with their coarse carbide component, could not retain a sharpened edge.
Btw, although non-stainless steels are (as you say) commonly referred to as carbon steels, the hardness of stainless steels also is determined by the percentage of carbon in the alloy. Just saying.
Iceland