The present invention provides a stainless steel which is suitable for use in the food manufacturing
plant, particularly a soy sauce manufacturing
plant. A stainless steel to be used in the environment which contains
organic acid and common salt comprising, C; 0.05 wt % or less, Si; 1.00 wt % or less, Mn; 1.00 wt % or less, P; 0.040 wt % or less, S; 0.03 wt % or less, Ni; 40.0 wt % or less, 16.0 wt %≦Cr≦26.0 wt %, 2.0 wt %≦Mo≦8.0 wt %, 0.05 wt %≦Al≦0.100 wt %, 0.10 wt %≦N≦0.30 wt %, Mg: 0.005 wt % or less, Ca; 0.0010 wt % or less and balance consisting of Fe and inevitable impurities, and satisfying equation (1), Cr+3.3Mo+20N≧38 (1) wherein, Cr, Mo and N show the content of each ingredients by weight %.