How many years do steel pipes and fasteners on construction sites usually last?

This can't be calculated in years, it depends on the degree of protection. If it is new, it won't move once it is buckled. This will last for many years. But if it is disassembled continuously, the wear will be very serious. It may be broken in less than half a year.

Generally, the fasteners on the construction site are not replaced until the service life, which is man-made damage.