Compared with other bolts and screws, stainless steel bolts and stainless steel screws have a wider range of applications in low temperature and high temperature parts, so metal screws are becoming more and more popular in practical use. The following are the hardware screw failure hazards and anti-corrosion measures:
First, the danger of hardware screw failure
Generally, carbon steel and alloy steel bolts fail under the condition that the surface has obvious corrosion products and thinning, and the stainless steel screws lose strength under the condition that almost no change is seen on the surface, causing serious damage to the structure or equipment. Its failure is more insidious and harmful.
Second, the anti-corrosion measures of the hardware screws
1. Use qualified stainless steel screws to avoid the formation of gaps in the structural design and avoid the geometric conditions that cause surface deposition easily;
2, the stainless steel screw and Cl-containing solution for effective isolation, can not avoid the gap, through the stainless steel screw anti-corrosion effect to understand, should be welded or fill the gap, so that the aqueous solution can not enter;
3. The use of stainless steel with high chromium and high molybdenum, especially in the low temperature tank area, the spherical tank area, and the stress corrosion serious area, the steel with good corrosion resistance is better.