This Standard specifies the terms and definitions, classification and sign, ordering contents, size, weight and permissible deviation, technical requirements, test methods, inspection rules, package, marking, and quality certificate, etc. of hot-dip galvanized steel strand for prestress. This Standard is applicable to the low-relaxation prepressed steel strands (hereinafter referred to as steel strands consisting of seven hot-dip galvanized round steel wires, with diameters of 12.7mm, 15.2mm, 15.7mm, 17.8mm, and strength levels of 1770MPa, 1860MPa, 1960MPa, used for bridge cables, anchoring tensile members, buildings for lifting or fixing tensile members, and other prestressed structures not directly in contact with the concrete mortar.