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答案（中文）
合金被视为“特殊混合物”（REACH法规第31条），必须与REACH法规下的任何其他混合物同等对待。在这方面，合金本身无需注册，但其合金元素（例如金属）则需注册，无论其生产工艺如何。非故意添加且对合金特性并非必需的成分被视为杂质（即，它们是混合物中物质的一部分），因此无需单独注册。对于每种合金元素的注册，注册人必须满足REACH法规附件VI第2条的信息要求。这包括元素的名称和数字标识符、成分以及能够确认该元素是合金组成部分的分析数据。由于注册的是合金元素，因此IUCLID档案第1.2条中的成分应仅指合金元素；不应报告合金的成分。如果公司将某种金属注册为物质和各种合金中的元素，则应在第 1.2 节中报告两份成分记录：一份记录该金属作为物质（包括其已知的固有杂质），另一份记录该金属作为合金元素。一般原则上，第 1.4 节中的分析数据需要报告合金元素本身。如果无法报告，则可以报告合金的分析数据，并说明无法报告该元素数据的原因。由于潜在注册人可能注册某种元素（例如“Fe”）以履行其在多种不同合金中的注册义务，因此报告代表性合金的分析数据以确认该合金元素的存在即可。为避免注册档案涵盖内容的歧义，注册人应明确报告其档案中涉及的合金元素，以便注册含有该元素的合金。这可以包含在IUCLID档案1.2节成分记录的“成分描述”字段中。请注意，金属间化合物（例如“铝与铁的化合物（1:1）”、“铁与钛的化合物（2:1）”等）经常被误认为是合金。此类物质具有明确的化学计量，已收录于EINECS，不能被视为混合物，因此必须进行注册。
Answer (EN)
Alloys are regarded as "special mixtures" (Recital 31 of REACH) and must be treated in the same way as any other mixture under REACH. In this respect, an alloy as such is not subject to registration but its alloying elements (e.g. metals) are, irrespective of the production process of the alloy. Components which are not intentionally added and are not essential for the properties of the alloy are considered as impurities (i.e. they are part of a substance in the mixture) and therefore do not need to be registered separately. For the registration of each alloying element, registrants must fulfil REACH Annex VI Section 2 information requirements. This includes the name and numerical identifiers of the element, composition and analytical data that allows confirmation that the element is part of an alloy. Since it is the alloying element that is registered, the composition in section 1.2 of the IUCLID dossier should refer solely to the alloying element; the composition of the alloy should not be reported. Where a company is registering a metal as a substance and as an element in various alloys, two composition records should be reported in section 1.2: one for the metal as a substance including its known inherent impurities, and one for the metal as an alloying element.As a general principle, the analytical data in section 1.4 needs to be reported on the alloying element itself. Where this is not feasible, analytical data can be reported on the alloy, with the rationale as to why it was not possible to report data generated on the element. Since a potential registrant may be registering an element (e.g. "Fe") to fulfil registration obligations for the element in multiple different alloys, it is sufficient to report analytical data generated on a representative alloy to confirm the presence of the alloying element. To avoid ambiguity on what the registration dossier is covering, registrants shall report clearly that their dossier refers to an alloying element for the registration of alloys that have this element. This can be included in the "Description of the composition" field in the composition record included in section 1.2 of the IUCLID dossier.Note that intermetallic compounds (e.g. "aluminium, compound with iron (1:1)", "iron, compound with titanium (2:1)", etc.) are often incorrectly regarded as alloys. Such substances have a well-defined stoichiometry, are listed in EINECS and cannot be regarded as mixtures, thus they have to be registered.