SS 316 304 DIFFERENCE

- Jul 28, 2017 -

SS 316 304 DIFFERENCE

-------From wuxi xichu stainless steel co.,ltd


The simple answer is 304 contains 18% CR and 8% NI while 316 contains 16% CR 10% NI and 2% MO. The molybdenum is added to help resist corrosion to chlorides (like sea water and de-icing salts).


304 Stainless Steel

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Stainless steel provides an attractive, clean finish with low maintenance cost

304 stainless steel is the most common form of stainless steel used around the world, largely due to its excellent corrosion resistance and value. It contains 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 304 stainless steel is 18-8, or 18/8, stainless steel, which contains 18 percent chromium and 8 percent nickel.

304 can withstand corrosion from most oxidizing acids. That durability makes 304 easy to sanitize, and therefore ideal for kitchen and food applications. It is also common in buildings, décor, and site furnishings.

304 stainless steel does have one weakness: it is susceptible to corrosion from chloride solutions, or from saline environments like the coast. Chloride ions can create localized areas of corrosion, called "pitting," which can spread beneath protective chromium barriers to compromise internal structures. Solutions with as little as 25 ppm of sodium chloride can begin to have a corrosive effect.


316 Stainless Steel

316 grade is the second-most common form of stainless steel. It has almost the same physical and mechanical properties as 304 stainless steel, and contains a similar material make-up. The key difference is that 316 stainless steel incorporates about 2 to 3 percent molybdenum. The addition increases corrosion resistance, particularly against chlorides and other industrial solvents.

316 stainless steel is commonly used in many industrial applications involving processing chemicals, as well as high-saline environments such as coastal regions and outdoor areas where de-icing salts are common. Due to its non-reactive qualities, 316 stainless steel is also used in the manufacture of medical surgical instruments.

Alternative 300-series grades can contain up to 7 percent molybdenum. They provide even better chloride resistance, but such heavy-duty resistance is only necessary in industrial or high concentration exposure conditions.

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Both 304 and 316 stainless steels (as well as other 300-series grades) use nickel to maintain an austenitic composition at lower temperatures. Austenitic steels ensure a versatile balance of strength, workability, and corrosion resistance, making them ideal for outdoor architectural features, surgical instrumentation, and food processing equipment.

A large volume of stainless steel produced today (especially 316 stainless steel) can be found in products related to the food and beverage industries. Stainless steel is commonly found in commercial kitchens and food processing plants as it serves a variety of needs:

· It can be easily formed and fabricated into shapes needed to produce a variety of equipment and machinery, such as cooking tables, ventilation hoods, tanks, and hoppers.

· It is available in a wide range of decorative and polished finishes.

· It can withstand shock and abrasive conditions found in kitchens or food processing plants.

· It can be easily cleaned, and can withstand repeated washing with the many chemicals and detergents employed to meet public health demands.

· It does not react to the alkalis and acids found in milk, cooked foods, vegetables, and food additives.


APPLICATIONS:



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