I was heavily into metallurgy in college , and the first thing Im forced to point out is that NOT all steel has the same potential to be hardened, or heat treated.
but this should help
http://www.sizes.com/materls/colors_of_ ... metals.htm
http://www.threeplanes.net/toolsteel.html
http://www.tpub.com/content/constructio ... 250_28.htm
http://steel.keytometals.com/Articles/Art12.htm
http://www.roymech.co.uk/Useful_Tables/ ... ening.html
http://www.engineeringtoolbox.com/tempe ... _1530.html
http://lametalsmiths.org/news/robb_gunter.htm
http://www.green-trust.org/junkyardproj ... IJun51.pdf
http://www.youtube.com/watch?v=9tlsq2ESQz0
http://en.wikipedia.org/wiki/Case_hardening
http://www.hocktools.com/Diyht.htm
http://www.technologystudent.com/equip1/heat2.htm
http://www.engnath.com/claytemp.htm
http://books.google.com/books?id=XohAAA ... te&f=false
but this should help
http://www.sizes.com/materls/colors_of_ ... metals.htm
http://www.threeplanes.net/toolsteel.html
http://www.tpub.com/content/constructio ... 250_28.htm
http://steel.keytometals.com/Articles/Art12.htm
http://www.roymech.co.uk/Useful_Tables/ ... ening.html
http://www.engineeringtoolbox.com/tempe ... _1530.html
http://lametalsmiths.org/news/robb_gunter.htm
http://www.green-trust.org/junkyardproj ... IJun51.pdf
http://www.youtube.com/watch?v=9tlsq2ESQz0
http://en.wikipedia.org/wiki/Case_hardening
http://www.hocktools.com/Diyht.htm
http://www.technologystudent.com/equip1/heat2.htm
http://www.engnath.com/claytemp.htm
http://books.google.com/books?id=XohAAA ... te&f=false