Under normal conditions, the service life of channel steel can range from 15 - 50 years. If it is properly maintained and has appropriate surface treatment, such as hot - dip galvanizing, it can last longer. In a relatively dry and non - corrosive environment, channel steel without significant mechanical damage can maintain its performance for a long time. However, in harsh environments with high humidity, chemical corrosion, or frequent mechanical impacts, its service life will be shortened. Regular inspection and maintenance can help extend its service life.