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Opened July 1999, zOwie is the Internet's first and longest running discussion forum dedicated to Omega brand watches.

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Re: Metallurgy 101
In Response To: Metallurgy 101 ()

I would remind everyone that the 300 grade of stainless steel is non-magnetic and can not be hardened by heat treating. The 400 grade 420 and 440c is magnetic and can be hardened to 58-60 Rockwell. This is a measurement by which a piece of SS is put in a machine and punched. The depth of the punch is measured and the less a depression in the steel, the harder the steel. This is done before and after heat treating. Heat treating is heating the steel for lengthy periods (depending on the matl. and how hard you want it to be)of time to change it's internal molecular structure. The 400 grade of stainless steel is what a lot of knifemakers use to get a very hard knife that will hold an edge, but also is malleable enough that it will not shatter if dropped. (Cold steel, Buck etc. use 440c in many of their knives.)

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