One of the more widely used ferritic stainless steels is 430. This makes it an ideal fit for such applications as appliances and cookware, among others. The moderate-to-good corrosion resistance level of this family increases with chromium content. Overall, the weldability and impact toughness of ferritic stainless steels are not as good as those for austenitic. But that means they are a bit more difficult to produce than standard austenitic stainless steel. Ferritic stainless steel contains iron-chromium alloys with body-centered cubic crystal structures-they are plain chromium stainless steels with varying chromium content between 12 and 18%. This grade is corrosion resistant to natural food acids, basic salts, water and most atmospheric conditions.Ĭonsider the corrosion resistance of this family of stainless steels to be ‘moderate-to-good’ with those levels increasing with chromium content. This heat-treatable product is ideally suited for applications used in air, fresh water or with limited amount of chemicals and acids environments where corrosive elements aren’t severe.įor applications where higher corrosion resistance is required, 416 is ideal. The oil industry is a heavy user of martensitic stainless steel, as is the medical field-primarily for surgical equipment.Īmong the most widely used grades of martensitic is 410. The main alloying element of this family is chromium. Like low alloy or carbon steels, martensitic stainless steels are similar in structure to ferritic, but can be hardened or strengthened by heat treatment-which can also make them more brittle. In general, martensitic stainless steels are considered ‘moderate’ when it comes to corrosion resistance. Today there are many different grades of stainless steel-which are broken out into five families:Įach family has its own set of benefits in comparison to the others:īut when it comes to corrosion resistance, which stainless steel family ranks highest? Let's compare three of the five families: The rest of the makeup is defined by various alloying elements, which control the microstructure of the alloy. All stainless steels are iron-based alloys containing at least 10.5% chromium. Let’s start with a basic rule of thumb, which says the higher the chromium levels contained within the stainless steel, the more corrosion resistant the product. The emphasis on corrosion resistance is important due in large part to the varying types of environments in which the end products are used.
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