Stainless steel door handles are made of iron, chromium, manganese, silicon, carbon, nickel, and molybdenum. Each stainless steel door handle contains at least 10 percent of chromium, which reacts with oxygen and prevents it from reaching the metal's surface. The resulting film prevents rust from occurring. Stainless steel door handles should be regularly maintained. If you use a cleaning sponge, it won't scratch the material.