Tensile property analysis of 20A-2 escalator drive chain

The 20A-2 drive chain is one of the commonly used drive chain models for escalators. In this paper, the tensile properties of a 5-year-old drive chain were tested. The tensile properties and microstructure were analyzed. The tensile test results show that the tensile strength meets the requirements of relevant standards. The results of microstructure analysis show that there are poor and decarburized phenomena on the surface of outer chain plate and intermediate chain plate.