What Makes Stainless Steel Stainless?

All steel is made of carbon, however stainless steel contains up to 10% chromium. The steel is unique in its ability to resist corrosion due to the addition of chrome. The presence of chromium makes stainless steel passive, and it doesn't rust. The chromium is a form of passive oxide that protects the surface from further corrosion. This passivating surface prevents oxygen, water and other contaminants from contacting stainless steel. Engineers or designers are prone to undervalue or ignore these benefits due to stainless steel’s perceived higher price.

Nickel further increases the steels' resistance to harsh environment and life expectancy. Nickel increases the steel's toughness, impact resistance and strength while improving its resistance to oxidation and corrosion. In chloride containing solutions, molybdenum and nitrogen alloying components help the stainless to resist pitting. While T316 stainless contains molybdenum T304 does NOT. Specific high-chromium, nickel-alloyed grades increase the resistance to heat.

Stainless has a very high strength-toweight even at higher temperatures. Its nonporous exterior makes it easy and convenient to clean. This is ideal for food and medical grade applications, which need to limit the spread of bacteria. Surfaces do not stain, but can be buffed to create a more aesthetic look. If you take into account the overall life-cycle costs, stainless steel can be the least expensive choice.

Are you interested in learning more? Sewaly Metals has years of experience in metals and can help you with designing and manufacturing your metal product. Contact us today to discuss your unique needs.