Failure hazards of stainless steel screws and anti-corrosion measures

Compared with other bolts and screws, stainless steel bolts and stainless steel screws have a wider range of applications regardless of low temperature or high temperature. Therefore, stainless steel screws are more and more commonly used in actual use.

1. The harm of stainless steel screw failure.

Generally, carbon steel and alloy steel bolts fail when there are obvious corrosion products and thinning on the surface, while stainless steel screws will lose strength when there is almost no change on the surface, causing structural or equipment damage Serious damage, its failure is more concealed and harmful. (Guide: Knowledge of Fasteners: Working Principle of Pressure Riveting Nuts)

Two, anti-corrosion measures of stainless steel screws

1. Select qualified stainless steel screws, avoid gaps in the structural design, and avoid geometric conditions that are prone to surface deposition;

2. Effectively isolate the stainless steel screw from the Cl-containing aqueous solution, and the gap cannot be avoided. Through the introduction of the anti-corrosion effect of stainless steel screw, we should use welding or fill the gap to prevent the aqueous solution from entering;

3. Use stainless steel with high chromium and high molybdenum, especially in the low-temperature tank area, spherical tank area, and severe stress corrosion area using steel with good corrosion resistance, the effect is better.

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