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Performance Comparison Of 316, 316l And 304 Stainless Steel

Dec. 03, 2019

1. Corrosion resistance

316 stainless steel has better corrosion resistance than 304 stainless steel, and has good corrosion resistance in the production process of pulp and paper, such as 316 Stainless Steel Sheet. And 316 stainless steel is also resistant to marine and aggressive industrial atmospheres. In general, 304 stainless steel and 316 stainless steel have little difference in chemical resistance, but they are different in some specific media. The first stainless steel developed was 304, which in certain cases is more sensitive to pitting corrosion. An additional 2-3% molybdenum can reduce this sensitivity, and 316 is born. In addition, these additional molybdenum can reduce the corrosion of certain hot organic acids. 316 stainless steel has almost become the standard material for the food and beverage industry. Due to a worldwide shortage of molybdenum and more nickel in 316 stainless steel, 316 stainless steel is more expensive than 304 stainless steel. Pitting corrosion is a phenomenon mainly caused by the deposition corrosion on the surface of stainless steel, which is due to the lack of oxygen and cannot form a protective layer of chromium oxide. Especially in small valves, the possibility of deposits on the valve plate is very small, so pitting corrosion also rarely occurs. In various types of water media (distilled water, drinking water, river water, boiler water, seawater, etc.), in most cases, the corrosion resistance of 304 stainless steel is not much different from that of 316 stainless steel, but in some cases it may be very different Large, need specific analysis.

Stainless Steel Sheet

Stainless Steel Sheet

2. Heat resistance

In intermittent use below 1600 degrees and continuous use below 1700 degrees, 316 stainless steel has good oxidation resistance. In the range of 800-1575 degrees, it is best not to continuously act on 316 stainless steel, but when the 316 stainless steel is continuously used outside this temperature range, the stainless steel has good heat resistance. 316L stainless steel has better resistance to carbide precipitation than 316 stainless steel, and can be used in the above temperature range.

3. Heat treatment

Anneal in the temperature range of 1850-2050 degrees, then quickly anneal, then quickly cool. 316 stainless steel cannot be hardened by heat treatment.

4. Welding

316 stainless steel has good welding performance. All standard welding methods can be used for welding. In order to obtain the best corrosion resistance, the welded section of 316 stainless steel needs post-weld annealing. If using 316L stainless steel products such as 316l Stainless Steel Pipe, post-weld annealing is not required.

5. Mechanical properties

Among all steels, the austenitic stainless steel has the lowest yield point. Therefore, from the perspective of mechanical properties, austenitic stainless steel is not the best material for the valve stem, because to ensure a certain strength, the diameter of the valve stem will increase. The yield point cannot be increased by heat treatment, but can be increased by cold forming.

6. Magnetic

Due to the wide application of austenitic stainless steel, people have the false impression that all stainless steels are non-magnetic. For austenitic stainless steel, it can basically be understood as non-magnetic, and it is true of hardened forged steel. However, the 304 processed by cold forming is somewhat magnetic. For cast steel, it is not magnetic if it is 100% austenitic stainless steel.

The above is a comparison of several stainless steel models listed by 304 Stainless Steel Plate Suppliers for everyone, I hope to help everyone.

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