Corrosion resistance includes rust resistance and resistance to corrosive media such as acids, alkalis, and salts, as well as resistance to oxidation, sulfidation, chlorination, fluorination, etc. at high temperatures. Since the selection of different stainless steel hexagonal rods is mainly to solve various corrosion problems encountered in actual projects, material selectors need to consider the corrosion resistance of stainless steel hexagonal rods in corrosive environments. Corrosion is the damage caused by chemical or electrochemical interaction between metal and medium, and corrosion resistance refers to the ability of stainless steel hexagonal rods to resist corrosion damage from the medium. Therefore, when selecting materials involving corrosion resistance, you need to pay attention to the following points:

The standard of corrosion resistance is artificially determined. It must be recognized and used, but it must not be restricted by it. The specific standard of corrosion resistance must be determined according to the specific use requirements.

At present, the corrosion resistance of stainless steel hexagonal rods mostly adopts the 10-level standard. Which level is selected as the corrosion resistance requirement depends on the characteristics of the equipment (thickness, size). Requirements for service life, product quality (such as impurities, color, purity), etc. Generally speaking, for equipment, instruments and components that require smooth mirror surfaces or precise dimensions during use, you can choose level 1 to 3 standards; closely cooperate with the requirements For equipment that does not leak for a long time or requires limited use, components should be grade 2 to 5. For equipment that does not require high maintenance and easy maintenance or does not require a long service life, components can be grade 4 to 7. Except for special exceptions, stainless steel hexagonal rods Those with annual corrosion rates exceeding 1 mm under usage conditions are generally not used. It should be pointed out that the Grade 10 standard is not applicable when local corrosion occurs.

Corrosion resistance is relative and conditional. It is often said that stainless steel hexagonal rods are rust-free. Corrosion resistance refers to relative to rust and non-corrosion resistance. It refers to under certain conditions (medium, concentration, temperature, impurities, pressure, flow rate, etc. at certain times). So far, there is no stainless steel hexagonal bar that is rust-free and corrosion-resistant in any corrosive environment. Therefore, material selection personnel must carefully select according to the specific use conditions. After the stainless steel hexagonal bar grade is selected, the user department must also Correct use according to the characteristics of the selected stainless steel hexagonal rod, that is, reasonable selection of materials and correct use can achieve the purpose of being rust-free or corrosion-resistant.

When applying the corrosion resistance data of stainless steel hexagonal rods in various manuals, it should be noted that many of the data are only the test results of some experiments, which are often quite different from the actual medium environment. In order to obtain the corrosion resistance data that is closer to the actual use conditions, Corrosion data should generally be carried out in the laboratory through corrosion tests with actual media or coupon tests under field conditions. If necessary, tests with simulation devices should also be carried out.

Under some conditions of use, this situation will also be encountered. When the working medium or the industrial products produced contain even a trace amount of a certain metal ion or a certain stainless steel hexagonal rod, it will affect the chemical process. The quality of industrial and industrial products (including gloss, color, purity, etc.). This situation is common in industries such as nuclear fuel pharmaceuticals and pigments. At this time, stainless steel hexagonal rods that do not contain certain elements are often selected, or the corrosion resistance grade of the stainless steel hexagonal rods is appropriately increased to reduce metal ions to the allowable limit. If a component of stainless steel hexagonal rod equipment fails due to corrosion, the cause of the corrosion damage should be analyzed, and measures should be taken after identifying the cause, rather than throwing it away.