inal chromium contents of 12, 17, and 27% corresponding
to alloys 405, 430, and 446, respectively
(Table 1 and Fig. 13). The carbon content
is 0.12% maximum for type 430. This steel is
normally supplied in the annealed condition
and, with the exception of the rapid cooling
such as may occur after welding, type 430 is
considered a nonhardenable material. By comparison,
martensitic alloy 410 with 12% Cr and
0.12% C is fully air hardenable, while 12% Cr
ferritic alloy 405 with 0.08% C is not (Ref 24).