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Corrosion resistance of 316 stainless steel wire

2019-03-27

The 316 and 316L stainless steel wires are molybdenum-containing stainless steel. The content of molybdenum in 316L stainless steel wire is slightly higher than that of 316 stainless steel wire. Due to the molybdenum in steel, the total performance of this steel is better than that of 310 and 304 stainless steel. When the concentration of sulfuric acid is lower than 15% and higher than 85% under high temperature conditions. , 316 stainless steel has a wide range of uses. 316 stainless steel also has good chloride attack properties and is therefore commonly used in marine environments. 316L stainless steel has a maximum carbon content of 0.03 and can be used in applications where annealing is not possible and maximum corrosion resistance is required.

Corrosion resistance

316 stainless steel has better corrosion resistance than 304 stainless steel and has good corrosion resistance in the production of pulp and paper. Moreover, 316 stainless steel is also resistant to erosion by marine and aggressive industrial atmospheres.

In general, 304 stainless steel wire and 316 stainless steel wire have little difference in chemical resistance, but it is different under certain media.

The stainless steel originally developed was 304. In certain cases, this material is sensitive to pitting Corrosion. An additional 2-3% increase in molybdenum reduces this sensitivity, which gives birth to 316. In addition, these additional molybdenum can also reduce the corrosion of certain hot organic acids.

316 stainless steel wire has almost become the standard material for the food and beverage industry. Due to the shortage of molybdenum in the world and the higher nickel content in 316 stainless steel , the price of 316 stainless steel wire is more expensive than 304 stainless steel.

Pitting corrosion is a phenomenon mainly caused by deposition corrosion of stainless steel surfaces due to the lack of oxygen to form a chromium oxide protective layer.

Especially in small valves, the possibility of deposits on the valve plate is small, so pitting corrosion is rare.

In all types of water media (distilled water, drinking water, river water, boiler water, sea water, etc.), 304 stainless steel and 316 stainless steel have almost the same corrosion resistance, unless the chloride ion content in the medium is very high, then 316 stainless steel more suitable.

In most cases, the corrosion resistance of 304 stainless steel and 316 stainless steel is not much different, but in some cases it may vary widely, and specific analysis is required. In general, valve users should be aware of the fact that they will select the material of the container and the pipe according to the condition of the medium. It is not recommended to recommend the material to the user.


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Stainless steel wire use precautions