ISO 5003:2016规定了铁路用轧制和热处理钢轨的术语和定义、买方提供的信息、尺寸公差、长度、技术要求、检验规则、标识、认证和质量保证体系。 ISO 5003:2016规定了直线质量为43 kg/m及以上的平底（vignole）铁路钢轨，用于常规和高速铁路轨道。 规定了19个珠光体钢等级，涵盖200 HBW至400 HBW的硬度范围，包括“非- 热处理的“碳锰钢”、非热处理的“合金钢”、热处理的“碳锰钢”和“热处理的”低合金钢。

ISO 5003:2016 specifies the terms and definitions, information to be supplied by the purchaser, tolerances for dimensions, length, technical requirements, inspection rules, identification, certification, and a quality assurance system for as-rolled and heat-treated steel rails for railways. ISO 5003:2016 specifies flat bottom (vignole) railway rails with linear mass of 43 kg/m and above, for conventional and high-speed railway track usage. There are 19 pearlitic steel grades specified, covering a 200 HBW to 400 HBW hardness range and including "non-heat-treated" carbon manganese steels, "non-heat-treated" alloy steels, "heat-treated" carbon manganese, and "heat-treated" low alloy steels.