Ferritic stainless steels are iron-chromium alloys which cannot be hardened significantly by heat treatment.
The ferritic types are intermediate in their ability to withstand corrosion. Increasing the amount of chromium raises the corrosion resistance of the metal. A chromium content of about 10% is necessary to ensure maximum corrosion resistance. Further amounts of chromium (up to about 20%) are utilized to increase the resistance of the metal to oxidation and scaling at elevated temperatures.
Ferritic types are highly resistant to atmospheric oxidation and strong oxidizing solutions. Qualities include adaptability to high-temperature, chemical plant, and outdoor use.
Ferritic stainless steels are magnetic in all conditions.
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