303 vs 630 Stainless Steel Alloy
AISI 630 is a stainless steel that contains 17% chromium and 7% nickel. It is slightly magnetic and has good corrosion resistance. Chemical Composition. The primary difference between the two alloys is their chemical makeup. The 303 stainless steel alloy is composed primarily of chromium (Cr), nickel (Ni), and copper (Cu).