和以上的平底 (丁字形) 铁道钢轨

[中文适用范围]： 本国际标准 specifies the terms and definitions, information to be supplied by the purchaser, tolerances for dimensions, length, technical requirements, inspection rules, identification, certification, and quality assurance system for as-rolled and heat-treated steel rails for railways. It 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 hardness range from 200 HBW to 400 HBW and including 'non-heat-treated' carbon manganese steels, 'non-heat-treated' alloys, 'heat-treated' carbon manganese, and 'heat-treated' low alloy steels. [外文原描述]： 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.