The corrosion resistance of 316 stainless steel plate is better than that of
304 stainless steel, and it has good corrosion resistance in the production
process of pulp and paper. And 316 stainless steel is also resistant to the
erosion of the ocean and the corrosive industrial atmosphere.
Generally speaking, 304 stainless steel and 316 stainless steel have little difference in chemical corrosion resistance, but they are different under certain specific media.
The stainless steel originally developed is 304. Under certain circumstances, this material is more sensitive to pitting corrosion. An additional 2-3% molybdenum can reduce this sensitivity, and thus 316 was born. In addition, these additional molybdenum can also reduce the corrosion of certain hot organic acids.
Stainless Steel Sheet Grade 304
316 stainless steel has almost become a standard material in the food and beverage industry. Due to the shortage of molybdenum in the range and the higher nickel content in 316 stainless steel, the price of 316 stainless steel is more expensive than 304 stainless steel.
Pitting corrosion is a phenomenon mainly caused by deposit corrosion on the surface of stainless steel. This is because the lack of oxygen prevents the formation of a chromium oxide protective layer.
Especially in small valves, the possibility of deposits on the valve plate is very small, so pitting corrosion rarely occurs.
In various types of water media (distilled water, drinking water, river water, boiler water, sea water, etc.), the corrosion resistance of 304 stainless steel and 316 stainless steel is almost the same, unless the content of chloride ions in the medium is very high.
In most cases, the corrosion resistance of Stainless Steel Sheet Grade 304 and 316 stainless steel is not much different, but in some cases it may also be very different, and specific analysis is required. Generally speaking, valve users should have a good idea, because they will choose the material of the container and pipe according to the condition of the medium, and it is not recommended to recommend materials to users.
