Stainless Steel Sheet Ryerson stocks many varieties of stainless steel sheet including 304 stainless steel, the most popular of the stainless steels. This type of stainless sheet thickness provides excellent corrosion resistance for both industrial and marine applications. AISI 304 stainless steel (UNS S30400) is the most commonly used material in stainless steels, and is usually purchased in an annealed or cold worked state. Because SS 304 contains 18% chromium (Cr) and 8% nickel (Ni), it’s also known as 18/8 stainless steel. The range of steel sheets which we produce is made of high graded 304 Stainless Steel Sheet, stainless steel 304 Sheet, UNS S30400,AISI,ASTM A240 304 Stainless Steel Sheet. With various dimensional specifications, these sheets find wide applications in manufacturing and fabricating engineering products.