![]() If scratches or contact with aggressive chemicals destroy the layer, it repairs itself as soon as the metal is exposed to the air again, forming a constant protective coat on the steel. This valuable attribute is a result of the addition of the alloying element chromium which reacts with oxygen in the air forming a layer of chromium oxide which protects the surface of the metal. Chemical Composition & Physical Properties. Type 409, cheapest type used for automobile exhausts ferritic (iron/chromium only). The word simply means the metal does not stain. Cumberland Diversified Metals buys and sells stainless steel, aluminum and other metals throughout North. heat-resistant poor corrosion resistance 11 Chromium, 8 Nickel. Each of the different grades of stainless steel contains different alloying elements that contribute to its properties such as resistance to corrosion, strength, and flexibility.īecause it’s a low-cost material, has a great appearance, has a high resistance to corrosion, and its durable, stainless steel has become very popular, and a preferred material in different applications. The most popular grades of stainless steel are 304 and 430. The term stainless steel refers to a wide variety of grades of metal that contain an alloy that has at least 10.5% of chromium. Maximum values are listed unless otherwise indicated If the grade that you are looking for isn't present, or, if you need to know any more information, you can either visit our mechanical properties page or our stainless steel data sheets. Martensitic steels are ideal for applications that require incredible strength.īelow is a table detailing the chemical composition of some of the stainless steel grades that are supplied by thyssenkrupp Materials (UK). Martensitic steels have low chromium content hence low corrosion resistance but, have high strength. The standard composition of stainless steel is 1618 chromium, 1014 nickel, 23 molybdenum, 2 manganese (maximum), 0.75 silicon (maximum), 0.10 nitrogen. While this range doesn’t match the corrosion resistance of austenitic steels, it’s a cost effective alternative and is often used in the catering industry. Austenitic stainless steels contains Chromium in the range 17 - 25 and Nickel in the range 8 - 20, with various elements added in an effort to achieve desired. Together, these differences result in a stainless steel with high performing oxidation and corrosion resistance at even higher temperatures. This range is known for its high resistance to corrosion because of its high chromium content combined with nickel.įerritic stainless steel is the second most popular. 441 stainless steel The two main differences in chemical composition between 409 and 441 stainless steel is the addition of niobium and a whopping chromium content between 17.5 and 19.5. The most common type of stainless steel is the austenitic stainless steel which features grades 304 and 316 stainless steels. The main alloying component in all stainless steel metals is chromium (10.5% minimum). Stainless steel is a composition of various elements to enhance corrosion resistance of steel.
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