In stainless steel, copper usually exists as a residual element. ... Although the presence of phosphorus in austenitic stainless steel promotes... Silicon is often used as a deoxidizing (killing) agent in steel smelting...
For example, if... must be monitored at very low levels (such as lead, copper, and tin), then scrap steel with low phosphorus content must be selected, and then OES... deoxidation, dephosphorization and degassing of molten steel.