site for carbon steel grades?
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the site below has more info than you'll ever need
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http://www.webelements.com/
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Tigerdirect.com\n\nhttp://www.tigerdirect.com/applications/category/category_tlc.asp?CatId=1946
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If you are talking about piping pressure classes, the 150# class that Jeffery S talked about is good for different pressures depending on the materials of construction and the design temperature of the system it is being used in. \n\nI don't have the current ANSI ratings for the steel 150# class but it is about 285 psi at 100 degrees and is derated up to about 95 psi at 750 degrees F.  Carbon steel (A105) is not recommended for sustained use above 750 degrees or so.\n\nFor steel there are other classes such as 300#, 600#, 900#, 1500# and 2500#. There are also classes for cast iron, ductile, some plastics and other materials.\n\nThe maximum working pressure is usually considered the same as the design pressure. That pressure is the maximum you should normally operate the system at. The code usually allows some brief pressure excursions above the design pressure.
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I used this site not too long ago when we were building our house. hope it helps.\n\nwww.reliableblades.com
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it typically depends on the carbon content of the steel...here is a link for the phase transformation diagram \n\nhttp://www.metalpass.com/metaldoc/general/phasecast_files/image001.jpg\n\nMaterial  Steel  \n  Steel is an alloy of iron and maximum 2.1% carbon. The strength increases with the contents of carbon. Low-carbon steel (less than 0.3 % carbon) is generally used for common industrial products such as nuts, sheets and tubes. \n\nMedium carbon steel (0.3 to 0.6 % carbon) is stronger than low carbon steel and used for automotive and machinery applications. \n\nHigh carbon steel (more than 0.6 % carbon), is strong, hard, and wear resistant and is used for cutting tools, springs and cutlery.  \n\nChemical symbol for iron (the dominant part of steel) is Fe, atomic number is 26, melting point is 1528 C, density 7.9.\nChemical symbol for carbon is C, atomic number is 6, density 2.3 (graphite).
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Density(g/cm3) Steel Grade \n7.93 201,202,301,302,304,304L,305,321 \n\n7.98 309S,310S,316,316L,347 \n\n7.75 405,410,420 \n\n7.70 409,430,434 \n\nThere are some familiar Density of stainless steel above. Wish it be helpful.
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Steel is an alloy of carbon and iron.  If you want stainless steel, throw in some Chromium, too.
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http://www.metalprices.com/
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Low Carbon Content \n\nIt is used as LCC steel..
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http://www.ordnancesurvey.co.uk/oswebsite/
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rockwell a b or c? and i believe that steel is 4130 steel which is about 65 on the rockwell c scale obviously give or take a few because the charts vary
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You could try this site.
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Structural steel ASTM-A36 400 650   \nSteel, high strength alloy ASTM A-514 690 760   \nSteel, high tensile 1650 1860   \nSteel, Piano wire  2000   \n\nrest below
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www.activated-carbon.com\nthis website should help
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International Directory of Chemical Engineering URLs\nhttp://www.ciw.uni-karlsruhe.de/chem-eng.html
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http://answers.atgnow.com/nasd/categoryBrowse.do