Steel Magnetic/
/Stainless Steel: Is magnetic if hardening?

Can we assume that the stainless steel can be hardened is magnetic?

Any non-magnetic stainless steels are the "austenitic weak." 100, 200 and 300 series are all austenitic stainless steels, ie not magnetic. Austenitic steels can not be hardened by heat treatment .* However, they can be hardened and / or strengthened considerably by cold working *, * Especially many degrees of 100 and 200. (Note: the common working methods are cold-rolling, cold drawing and cold forging.) In fact Most austenitic stainless steels are very difficult to machine due to work hardening rapid pace. steels ferritic 400 series can be " or "Martensitic" steel. Both types are magnetic. however, the "ferrite" grades can not be treated with heat either. Only "martensitic" stainless steels can be hardened by heat treatment. A good example is 440C type used for knives. Other examples are 410, 416, 420, and 431 ferritic steels can also be hardened by cold, but usually less than austenitic steels. I should also mention the rare 600 series, which are "hardening by precipitation alloys. These require rather complex thermal treatments to achieve their unusual force. Most of these are magnetic, although some are not. 600 Series are high-performance alloys for specialized applications too, such as aerospace and nuclear energy. The best known is the type 630, also known as 17-4 PH. http://www.azom.com/details.asp?ArticleID=2819

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/WALTER EGAN – MAGNET & STEEL (download)
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