Why do stainless steel screws rust?

- Mar 04, 2021-

Stainless steel screws encounter condensed water in polluted air. Pollution means that they contain a large amount of sulfide or carbon oxide. When they meet with water, they will form sulfuric acid and hydroxide, which chemically corrode stainless steel screws. Stainless steel screws will rust because the protective film of stainless steel is damaged, the stainless steel is oxidized, and the ability to resist corrosion is weakened.

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Standard Nut



Half-round head stainless steel screw The tensile strength of stainless steel screw increases evenly in the temperature range of 15~80°C. More importantly, as the temperature decreases, the impact toughness of stainless steel screws decreases slowly, and there is no brittle transition temperature. Therefore, stainless steel can maintain sufficient plasticity and toughness at low temperatures.

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Hexagon Head Bolts



Stainless steel generally refers to steel that has the ability to resist corrosion by air, water, acid, alkali salt or other media. According to the different alloy components, the focus is on rust resistance and acid resistance. Although some steels are rust-proof, they are not necessarily acid-resistant, and acid-resistant steels are usually rust-proof.