Stainless steels are a family of steels that contain at least 11% chromium in their composition. The main factor that provides the high corrosion resistance of these steels is; It is the presence of a dense, ductile, very thin and transparent oxide layer that is strongly attached to the surface. Thanks to this very thin amorphous layer, stainless steels gain resistance to corrosion by acting passively in chemical reactions. The oxide layer in question is formed in environments with oxygen, and even if it deteriorates due to external effects (cutting, abrasion, machining, etc.), it repairs itself and regains its former feature. In general, stainless steels are divided into five main groups: - Ferritic, - Martensitic, - Austenitic, - Ferritic-Austenitic (Duplex), - Alloys that can be precipitation hardened. The most widely used of these groups are undoubtedly the austenitic and ferritic stainless steels. Ferritic stainless steels are low carbon and contain 12-18% chromium, while austenitic stainless steels mainly contain 18% chromium and 8% nickel. Ferritic stainless steels can be magnetized because they do not contain nickel in the alloy. When the composition of the total stainless steel production is examined, it is seen that austenitic stainless steels are the most used stainless steel with 70% in production. The fact that stainless steel can be produced with different physical and chemical properties has enabled it to be used in many different areas, from kitchen and household appliances to the automotive industry, from machinery manufacturing to the construction sector.
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