I just read the CRB section on materials (p577) and I find myself a bit confused by the rules on material grade and magic runes. Specifically, the rules state that a certain level of purity is required for an item made of precious material to have certain rune levels. That's clear. What I find unclear is why this would not apply to iron weapons or those simply made of non-precious materials.
On page 577,
... but creating higher-level items and more powerful magic runes with precious material requires greater purity.
My bolding.
So, it seems pretty clear that this only occurs for items made of precious materials (although, I would be interested to know if anyone else has another reading of this). Then, can anyone think of a reason why that would not be true for iron? I mean, weapons made of low-grade precious materials are stated by the CRB as being an alloy (probably with steel). I am thinking that enchantments don't really mesh well with alloys... but that sounds like a boring interpretation.
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It does hold true for iron, but for iron getting the purest stuff is easy, so it doesn't affect the price or anything.
Using purer forms of common materials is so relatively inexpensive that the Price is included in any magic item.