A: Predominately Iron with 10.5% or more Chromium. Other
elements such as nickel are sometimes added to achieve certain
properties Stainless steels are commonly divided into five
groups: *martensitic stainless steels *ferritic stainless steels
*austenitic stainless steels *duplex (ferritic-austenitic)
stainless steel *precipitation-hardening stainless steels
martensitic stainless steels : the most common for types of
martensitic stainless steels for aerospace usage are :410, Greek
Ascoloy, Jethete properties of stainless steels in the
martensitic group are high strength and resist scaling and
oxidation at elevated temperatures. for knifemaking, the most
popular martensitic grade is probably 440c. 440C can be hardened
to 60 hrc They are magnetic, hardenable by heat treatments, and
are generally resistant to corrosion only to relatively mild
environments. Chromium content is generally in the range of 10.5
to 18%, and carbon content may exceed 1.2%. The chromium and
carbon contents are balanced to ensure a marte