The "metal industry" is a VERY broad term...
Even when you break it down more specifically, talking about the just the "steel" industry, you're talking about a global industry that has thousands of foundries large and small in every corner of the civilised globe.
If you're buying homemade metal from your local scrapyard, then sure, you're more then likely getting a hodge-podge of who knows what.
If you buy from a reputable source, who sources their materials from reputable sources, then you're more then likely getting what you're paying for, as it truly is a science to metallurgy.
Even when you hear folks talk about "chinese" or "pakistani" steel being inferior, truth is, the risk is greater for duds due to lack of regulation and accountability, but those are large countries and nuclear powers. Pakistan for example is the size of Texas and Oklahoma combined. It's not like there is only just one foundry in the entire country churning up all of their steel, and it's all crap. If they have the technology (which is readily available), they can certainly produce the product, and I'm certain some foundries do a far better job of in house standards then others do. Just like some US foundries are far worse then others.
If you're getting something that starts with say; CPM (crucible), CTS (carpenter), Sandvik, Bohler-Uldhelm, etc, then rest assured those are trademarked alloys made specifically by some of the top renowned steel manufacturers in the world!