304 stainless steel (UNS S30400) has a unique material composition with additions of 0.08 Carbon, 0.75 Si, 2.0 Manganese, 0.030 Sulfur, 0.045 Phosphorous.
The main element used to make steel as stainless is Chromium and it plays important role in forming the passive film. No other element can replace chromium in order to achieve its stainless property and influence the effectiveness of chromium in forming or maintaining the film.
Type 304 stainless steel is a T 300 Series Stainless Steel austenitic. It has a minimum of 18% chromium and 8% nickel, combined with a maximum of 0.08% carbon. It is defined as a Chromium-Nickel austenitic alloy. Grade 304 is the standard “18/8” stainless steel.
Equivalent grades for standard SS304, UNS S30400, WERKSTOFF NR. 1.4301, AFNOR Z7CN18‐09, EN X5CrNi18-10, JIS SUS 304, BS 304S31, GOST 08Х18Н10.