What is Stainless steel?
[[File:gateway arch.jpg|thumb|right|The very high, stainless steel arch called the [[Jefferson National Expansion Memorial|Gateway Arch]] is a part of [[Saint Louis, Missouri|St. Louis, Missouri's]] skyline.]] '''Stainless steel''', also known as '''inox steel''', is a [[steel]] [[alloy]] with a minimum of 10.5 or 11% [[chromium]] content by mass.<ref>{{Cite web | title = The stainless steel family | url = http://www.worldstainless.org/NR/rdonlyres/B2617D50-73AE-4FAB-BDCD-88ABD7891B97/4933/TheStainlessSteelFamily.pdf | accessdate = 2009-11-12 | archive-date = 2011-07-21 | archive-url = https://web.archive.org/web/20110721164812/http://www.worldstainless.org/NR/rdonlyres/B2617D50-73AE-4FAB-BDCD-88ABD7891B97/4933/TheStainlessSteelFamily.pdf | url-status = dead }}</ref><ref>{{cite web|url=http://www.steel.org/ |title=Steel glossary |accessdate=July 30, 2006 |publisher= American Iron and Steel Institute (AISI)}}</ref> Stainless steel does not stain, [[corrosion|corrode]], or [[rust]] as easily as ordinary steel, but it is not stain-proof.<ref>{{cite web|title = Why is stainless steel stainless?|url = http://www.stainless-online.com/why-stainless-steel-stainless.htm|accessdate = 2008-12-20|archive-date = 2009-01-26|archive-url = https://web.archive.org/web/20090126062839/http://stainless-online.com/why-stainless-steel-stainless.htm|url-status = dead}}.</ref> The term '[[corrosion]] resistant steel' is used when the [[alloy]] has less than the 12% minimum of [[chromium]], for example in the [[aviation]] industry. There are different grades and surface finishes of stainless steel, depending on where it will be used. Stainless steels have a higher resistance to [[oxidation]] ([[rust]]) and [[corrosion]] in many natural and man-made environments, Different stainless steels have different amounts of different metals in them, and they are good for different purposes. There are over 150 grades of stainless steel, of which fifteen are the most used. The idea behind stainless steel was [[discovered]] in the first part o