What type of damage to an alloy steel chain sling necessitates removal from service?

Replacement links being used in an alloy steel chain sling indicates that the sling may have undergone repairs which could compromise its integrity. When links in a chain sling are replaced, it is crucial that the replacement links are of the same specifications and strength rating as the original links. If they are not, the sling may not perform as designed under load, increasing the risk of failure. Therefore, any sling that has been modified with non-matching or inferior replacement links should be removed from service to prevent unsafe conditions.

Surface scratches, rusting, and discoloration, while they can indicate wear or degradation, do not automatically necessitate removal unless they significantly affect the sling's load-carrying capacity or structural integrity. Often, surface scratches can be deemed acceptable as long as they do not penetrate deeply into the material, rust may be treated or managed depending on severity, and discoloration typically does not affect functionality. However, improper replacement of any critical components like links raises immediate safety concerns, warranting the sling's removal from service.