The durability of carbon steel self-tapping inserts depends on the specific application environment and working conditions. While they have advantages in wear resistance, they have significant shortcomings in corrosion resistance; therefore, their "durability" is relative.
Good wear resistance: The hardness of carbon steel can be increased by increasing the carbon content. Some high-carbon steels can reach a hardness of HRC50-60, which makes them superior to ordinary stainless steel (such as 304 stainless steel, whose hardness is usually ≤HRC20) in resisting material impact and friction. In dry environments free from corrosive materials, carbon steel inserts can maintain a long service life.
Low cost: Carbon steel is readily available and easy to process, resulting in an overall cost far lower than stainless steel. It is suitable for budget-constrained, short-term use, or non-critical components.
Poor corrosion resistance: Carbon steel is primarily composed of iron and carbon, containing almost no corrosion-resistant elements such as chromium and nickel. In humid environments or when in contact with materials containing chloride ions (such as potassium chloride and ammonium chloride) or acidic components, it is highly susceptible to electrochemical corrosion, forming rust. This leads to decreased insert strength, thread damage, and even equipment leaks or malfunctions.
Reliance on surface treatment: To improve corrosion resistance, carbon steel inserts often require surface treatments such as galvanizing, painting, or chrome plating. However, these coatings are easily damaged under long-term friction and impact. Once damaged, corrosion spreads rapidly, requiring regular maintenance; otherwise, their lifespan will be significantly shortened.
