1. How to better choose the material of stainless steel bolts?
Stainless steel generally refers to steel that has the ability to resist corrosion by air, water, acid, alkali metal salts or other media. According to the different components of the alloy, the emphasis is on corrosion resistance and acid resistance. While some steels are rust resistant, they are not necessarily acid resistant, and acid resistant steel is usually rust resistant.
Requirements for mechanical properties, especially strength, of stainless steel screw materials; 2. Requirements for corrosion resistance of materials according to working conditions.
2. Stainless steel bolts will rust because the protective film of stainless steel is damaged?
Stainless steel bolts encountered water that condensed in the air. Pollution means they contain high amounts of sulfur compounds or carbon monoxide. When they come into contact with water, they form sulfuric acid and hydroxide, which chemically corrode stainless steel bolts. Stainless steel bolts rust because the protective film of stainless steel is destroyed, stainless steel is oxidized and its corrosion resistance is weakened, so stainless steel bolts will also rust.
3. Precautions for storing stainless steel bolts:
When storing stainless steel bolts, product protection should be strengthened, and in a dry environment, do not place galvanized iron bolts in damp places. Also, be careful not to violently underbox during the packing process. Non-standard parts with special requirements should be packed in net bags or other items, and care should be taken to avoid collisions with each other.
The hardness of a stainless steel bolt indicates the material's ability to withstand hard objects pressed into its surface. It is one of the important performance indicators of metal materials.
Generally, the higher the hardness, the better the wear resistance. Commonly used hardness indicators are Brinell hardness, Rockwell hardness and Vickers hardness. When testing the hardness of stainless steel nuts, bolts without heat treatment should only make the surface hardness within the acceptable range. If it is a heat-treated bolt, the hardness should be increased on the surface without diameter, and the hardness test should be carried out at 1/2R of the surface, and the hardness should meet the standard.
