Metallurgical aspects
Phosphorus is also an important component in steel production, in the making of phosphor bronze, and in many other related products.[77][78] Phosphorus is added to metallic copper during its smelting process to react with oxygen present as an impurity in copper and to produce phosphorus-containing copper (CuOFP) alloys with a higher hydrogen embrittlement resistance than normal copper.[79]
https://en.wikipedia.org/wiki/Phosphorus
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