18-8 stainless steel is a common austenitic stainless steel containing about 18% chromium and 8% nickel. Due to its unique composition and structure, 18-8 stainless steel dowel pins have significant advantages in corrosion resistance and strength, as shown below:
1. Corrosion resistance advantage:
The corrosion resistance of 18-8 stainless steel mainly comes from the chromium element. Chromium can form a dense passivation film (chromium oxide film) on the surface of stainless steel, which effectively prevents oxygen and moisture from reacting with the metal surface, thereby improving the corrosion resistance of the material. Its main features include:
Oxidation resistance: 18-8 stainless steel can maintain its performance for a long time in common oxidizing environments, such as high humidity or contact with air, it is not easy to rust.
Chemical corrosion resistance: 18-8 stainless steel has good corrosion resistance in most acid, alkali and salt environments, especially in mild acidic and neutral solutions.
Pitting resistance: 18-8 stainless steel is more resistant to pitting corrosion than ordinary steel, especially in seawater or chloride environments, and the passivation film formed on the surface can effectively prevent corrosion.
However, although 18-8 stainless steel shows good corrosion resistance in many environments, it may still be vulnerable to corrosion in strong acid and certain chloride environments.
2. Strength advantage:
The strength of 18-8 stainless steel is mainly determined by its special austenite structure, which gives the material good mechanical properties and toughness. Its strength advantage is reflected in the following aspects:
High tensile strength: 18-8 stainless steel has high tensile strength and can withstand large tensile forces without breaking. It is suitable for manufacturing pins that need to withstand large loads.
Good impact resistance and toughness: Austenitic stainless steel can still maintain good toughness at low temperatures, which enables 18-8 stainless steel to effectively withstand impact and vibration even in harsh environments.
Excellent fatigue strength: Due to its good ductility and plasticity, 18-8 stainless steel can withstand fatigue stress under long-term alternating loads without material fatigue fracture.
3. Comprehensive advantages:
Long life: Due to the excellent corrosion resistance and strength of 18-8 stainless steel, it is widely used in equipment and components that require long-term stability, such as building structures, mechanical equipment, food processing and chemical industry equipment.
High temperature resistance: Although the strength of 18-8 stainless steel will be reduced at high temperatures, it still has good high temperature stability and can maintain its performance within a certain temperature range.
Conclusion: 18-8 stainless steel dowel pins have significant advantages in corrosion resistance and strength and are suitable for a variety of harsh environments. Its corrosion resistance enables it to be used for a long time in wet, acidic or salt environments, while its strength ensures that the structure can still maintain stability under high load and impact conditions. Therefore, 18-8 stainless steel dowel pins are widely used in aerospace, construction, machinery, chemical and other industries.
