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Anti-rust features of 304 stainless steel

by:CBM     2021-06-18
Stainless steel refers to a metal material with certain chemical stability in the atmosphere, water, acid, alkali, salt and other solutions, or other corrosive media. When the composition of stainless steel contains a certain proportion of chromium and nickel, its corrosion resistance will undergo a sudden change, that is, it will become corrosion resistant and not easy to rust. 304 stainless steel material contains more than 18% chromium, and about 8% nickel, molybdenum, titanium, silicon, aluminum and other trace elements. These elements have high chemical stability and will form an oxidized passivation film on the surface of the steel. This film is extremely thin and transparent, and can only be seen under a microscope. What you can see with the naked eye is a shiny silver metal surface. This passivation film isolates stainless steel from external media such as air, acidic liquids, etc., protects it from oxidation, and enhances its corrosion resistance. Once the passivation film is damaged, the chromium and nickel in it will regenerate the passivation film with oxygen ions and continue to play a protective role. Because of this self-repairing function, 304 stainless steel has high corrosion resistance and will never rust.

There are many grades of stainless steel. Common stainless steel models include 316#, 304#, 202#, 201#, etc., of which 201# is stainless steel, 304# is stainless steel that meets the standards of food products, and 316# has strong anti-corrosion ability for marine and medical use. stainless steel. 304 stainless steel has bright surface, high plasticity, good toughness, high mechanical strength, and has the characteristics of welding and bending deformation. It is corrosion resistant and does not rust in acid and alkali gases, solutions and other media. The easy way to check the authenticity of 304 stainless steel is: first, soak in concentrated brine for 200 hours to see if there is any change; second, soak in concentrated acid for 10 hours to see if there is any change.

Non-magnetic (weak-magnetic) stainless steel material has a single-phase structure, which is easy to roll and has no cracks. Magnetic (strong magnetic) stainless steel has a dual-phase structure, which is difficult to roll and prone to cracks. Therefore, it is unscientific to judge the quality of stainless steel by whether it is magnetic or not. The dual-phase cast CF-8 standard 304# stainless steel must be magnetic (usually micro-magnetic), and its magnetic strength depends on the ratio of chromium to nickel.

Copper has poor corrosion resistance and will produce patina (commonly known as patina). Copper materials contain different proportions of lead. The so-called 'lead-free copper' faucets on the market are actually 'low lead contentCopper is very harmful to the human body, and especially has a great negative impact on children's intellectual development. Strictly speaking, it is difficult for copper to be low-lead or lead-free. It is difficult for customers to judge the quality of copper faucets. Many copper materials are doped with excessive lead-zinc alloy materials. The purpose is naturally to reduce the production cost, but it is extremely harmful to human health.
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