Stainless steel applied to the water medium, you need to take into account the salt content of the water medium, according to the different salt content, can be divided into high purity water, fresh water, semi-saline water and seawater. Among them, high purity water contains almost no salt, fresh water contains less than 0.05% salt; semi-saline water contains more than 0.05% salt, but less than the salt content of seawater; seawater salt content is in the range of 3% -3.5%.

Stainless steel applications

Stainless steel materials in the water medium, the most corrosion damage is localized corrosion, especially stress corrosion, pitting and crevice corrosion. High-purity water is mainly used in the nuclear industry, especially water as the cooling and working medium of boiling water and pressurized water nuclear reactors. Because high purity water chloride ions and oxygen are very low, stainless steel in this environment corrosion rate is very low, so water-cooled nuclear reactors in addition to a small number of materials such as nuclear fuel cladding, will be a large number of stainless steel, freshwater even if it contains a small amount of chloride ions and saturated oxygen, and even other impurities, but usually stainless steel corrosion is also very weak in general. So all types of stainless steel can be used in freshwater environment. Fresh water in the industry can not only do the medium can also be used as raw materials, so the amount is very high. In contact with industrial water equipment, components, the most commonly selected stainless steel is Cr13 type, Cr17 type and 18-8 type three categories. Various heat transfer equipment, such as heat exchangers, evaporators, coolers, condensers, heat exchangers, etc., the working environment in the industrial water conditions are the most demanding. The most commonly used is 18- 8 type steel, such as 0Cr18Ni11Ti, 0Cr19Ni9, 00Cr19Ni11, and sometimes OCr17Ni12Mo2 and OOCr17Ni14Mo2.

Selection of stainless steel use

Daily use of medical equipment, kitchen equipment and appliances and household utensils, etc., not only in contact with the atmosphere, but also often subject to corrosion of fresh water. The use of stainless steel in these conditions is also widely used because it is both beautiful, durable, hygienic and easy to clean. In the construction of hydropower stations, river water containing mud and sand scouring is inevitable, ultra-low carbon martensitic stainless steel, such as 0OCr13Ni4MoOOCr13Ni5Mo, etc. have better applications. In seawater, for general corrosion, the corrosion rate of stainless steel is not high, seawater on the stainless steel of the main form of damage is pitting corrosion, crevice corrosion and stress corrosion and eye is often subject to the oxygen content of seawater, chlorine ion concentration, seawater and the relative flow rate of the material, seawater contamination, temperature, and seabed life, and other factors directly affect. Usually, below room temperature, can use 2% -4% silver OCr17N12M02 and OCr19Ni13M03 and other stainless steel: below 4050 ° C seawater, usually choose high chromium, platinum austenitic stainless steel.

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The above is about the application of stainless steel in different water quality environment, we are a stainless steel factory in China.

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