http://www.timken.com/en-us/products/Steel/productlist/types/Pages/default.aspx

http://www.wlfuller.com/html/steel_types.html

http://www.wikipediaondvd.com/nav/art/g/9.html

http://www.thefind.com/appliances/info-stainless-steel-wall-mount-type

http://simple.wikipedia.org/wiki/Steel

http://research.the-bac.edu/virtual/steel/steel.html

http://www.gensteel.com/steel_buildings_types.htm

http://www.iransteelcenter.com/types/steeltype.htm

http://www.alibaba.com/showroom/Type_steel.html

http://www.citycollegiate.com/IX_steeltypes.htm