Phosphorus in steel can have beneficial as well as harmful effects. Phosphorus is one of the most potent solid-solution strengtheners of ferrite. The addition of only 0.17% phosphorus increases both the yield and tensile strength of low-carbon sheet steel by about 62 MPa (9 ksi) while also improving the bake hardening response and deep drawability. Because of these properties, rephosphorized high-strength steels are widely used for cold-forming applications. Phosphorus is also used as an additive in steels to improve machining characteristics and atmospheric corrosion resistance
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