AUSTENITIC, NON-MAGNETIC, STAINLESS STEEL ALLOY

摘要

An austenitic, non-magnetic, stainless steel alloy and articles made therefrom are disclosed which, in the wrought condition, are essentially ferrite-free and have a relative magnetic permeability of less than about 1.02, a room temperature 0.2% yield strength of at least about 100 ksi, and good resistance to stress corrosion cracking in chloride environments. Broad, intermediate, and preferred ranges are disclosed as follows: -w/o -Broad Intermediate Preferred -C 0.08 max. 0.05 max. 0.035 max. -Mn 14-19 15-18 16-18 -Si 1 max. 1 max. 0.75 max. -Cr 12-21 14-19.5 16-18 -Ni 3.5 2.5 max. 1.5 max. -Mo 0.5-4 0.75-2.5 1.0-2.0 -Cu 2.0 max. 1.5 max. 1.0 max. -N 0.2-0.8 0.3-0.7 0.4-0.6 -B 0.06 max. 0.005 max. 0.005 max. - the balance being iron. The alloy is balanced to be essentially ferrite-free and is further balanced according to Equations 1 and 2 (Eqs. 1 and 2) to provide good chloride SCC resistance: <IMAGE> (Eq. 1) w/o Mn<w/o Cr+w/o Mo(Eq.