The difference between 304 Stainless Steel and 316 Stainless Steel

The difference between 304 and 316 stainless steel the presence of molybdenum, which provides a much higher level of corrosion resistance-especially for more saline environments where exposure to chlorides expected. For outdoor site furnishings, stainless steel is a corrosion-resistant material ideal to withstand long-term exposure to the environment.

304 stainless steel with high resistance to rust. It will withstand corrosion from most oxidizing acids and is often used for kitchen and food applications. However, it is susceptible to corrosion from chloride solutions (especially saline environments with high amounts of sodium chloride). Chloride ions can create local areas of corrosion, known as “pitting” that can spread under protective chromium barriers to compromise internal structures. Solutions can have as little as 25 ppm of sodium chloride is corrosive effect beginning. 304 grade is the most common form of stainless steel used worldwide. It consists of between 16 and 24 percent chromium and up to 35 percent nickel as well as small amounts of carbon and manganese. The most common form of 18-8 stainless steel 304, or 18/8, stainless steel, which contains 18 percent chromium and 8 percent nickel.

316 grade is the second-most common form of stainless steel. It is almost the same mechanical and physical properties with 304 stainless steel and similar materials make up. The difference is 316 stainless steel comprising molybdenum about 2 to 3 percent, which increases corrosion resistance-especially against chlorides and other industrial solvents. Alternative grades can 300-series that up to 7 percent molybdenum. 316 stainless steel is commonly used in many industrial applications of process chemicals, as well as high-saline environments such as coastal regions and areas outside its de-icing salts are common. Because of its non-reactive qualities, stainless steel 316 is also used in the manufacture of medical surgical instruments.