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	Stainless steel, also known as inox steel or inox Stainless steel differs from carbon steel by the amount of chromium present. Carbon steel rusts when exposed to air and moisture. This iron oxide film (the rust) is active and accelerates corrosion by forming more iron oxide. Stainless steels have sufficient amounts of chromium present so that a passive film of chromium oxide forms which prevents further surface corrosion and blocks corrosion from spreading into the metal's internal structure. It is important to know that stainless steel is not rust and corrosion proof, just resistant. If we were to take a piece of stainless steel and submerge it completely in salt water, the salt would destroy the protective layer faster than it could be repaired and would result in corrosion Magnets and Stainless Steel- One of the ways metal is tested to see if it is stainless steel is by using magnets. It is assumed that if a magnet sticks, the sample is not stainless steel. This is not entirely true. The degree that the magnet sticks determines how much ferrous (material that magnets are attracted to) is present in the sample. Some stainless steel (martensitic) have a large amount of this material but it still remains stainless steel. Some items are carbon steel plated with stainless steel. Stainless Steel and American Garage Door Supply Applications American Garage Door Supply uses different kinds of stainless steel to maximize the characteristics needed for it’s individual components. Below explains what and why for each component.
	Stainless Steel Grade 303 (Austenitic) 302 (Austenitic) 304L (Austenitic) 316L (Austenitic) 440 Plated (Martensitic)	Application Torsion Shaft Torsion Springs Hinges, Face Hardware, Track Fasteners Garage Door Sections Fasteners	Why This Grade For This Application? Toughness, Machinability Toughness, Elasticity Machinability, Weldability High resistance to corrosion, Best for Sheet Forming Hardness, Strength, Highly Machinable
	Austenitic, or 300 series, stainless steels make up over 70% of total stainless steel production. They contain a maximum of 0.15% carbon, a minimum of 16% chromium and sufficient nickel and/or manganese to retain an austenitic structure at all temperatures from the cryogenic region (Extreme Cold) to the melting point of the alloy. A typical composition of 18% chromium and 10% nickel, commonly known as 18/10 stainless, is often used in flatware. Martensitic stainless steels are not as corrosion-resistant as the other two classes but are extremely strong and tough, as well as highly machinable, and can be hardened by heat treatment. Martensitic stainless steel contains chromium (12-14%), molybdenum (0.2-1%), nickel (0-<2%), and carbon (about 0.1-1%) (giving it more hardness but making the material a bit more brittle). It is quenched and magnetic. Did You Know? -You can use stainless steel as soap to neutralize or reduce strong odors from the hands, present from handling odorous ingredients such as garlic, onion or fish. Any piece of stainless steel, such as a spoon, can be used for this purpose.

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