1.1 本规程描述了未锻造铝锭、钢坯、铸件和成品或半成品锻造铝产品的取样程序，以获得用于确定化学成分的代表性样品。 1.1.1 根据本标准规程获得的样品测定的化学成分可能与铸锭或铸件浇注时取样测定的散装化学成分不同。这些差异可能是由于凝固过程中发生的元素偏析、去除富集材料的程序（例如铸锭剥落）或去除贫化区域的程序（例如来自铸件的冒口的移除）造成的。 1.1.2 从未锻造铝锭、钢坯和铸件以及成品或半成品中获得的样品分析- 成品锻造铝产品可用于确定所取样的零件是否符合股份有限公司铝协会注册的化学成分限制或合金的其他指定化学成分限制。此类样品的分析不得取代根据惯例在铸件或铸锭浇注过程中采集的样品的分析 E716 并按照测试方法进行分析 E1251 , E3061 ，或EN 14242，不得用于确定整个铸件或其部分是否符合化学成分要求。 注1: 工件可能包括铸锭、锻件、线圈、板材、挤压件、铸件等。一个未锻造的铸锭或钢坯可能会产生多个成品或半成品。 注2: 应根据惯例，使用铸件或铸锭浇注过程中采集的样品来确定整个铸件批次的认证 E716 并按照测试方法进行分析 E1251 , E3061 或EN 14242。 1.2 单位-- 以国际单位制或英寸-磅单位表示的值应单独视为标准值。每个系统中所述的值可能不是完全等效的；因此，每个系统都应独立使用。将两个系统的值结合起来可能会导致不符合标准。 1.3 本标准并不旨在解决与其使用相关的所有安全问题（如果有的话）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.4 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 =====意义和用途====== 5.1 本规程涵盖的产品是未锻造的铝锭、钢坯和铸件，以及未包覆的锻造铝板、板材、轧制或冷加工挤压件、挤压型材、线材、棒材和棒材。机加工锻造产品（成品或半成品）不包括在内（见 附注3 ). 这些实践与实践中的适当样品制备技术结合使用 E716 以及测试方法 E1251 , E3061 和EN 14242，适用于确定所取样的零件是否符合美国铝业协会股份有限公司注册的化学成分限制。 4. 或合金的其他指定化学成分限制。此类样品的分析不得取代根据惯例在铸件或铸锭浇注过程中采集的样品的分析 E716 并按照测试方法进行分析 E1251 , E3061 ，或EN 14242，不得用于确定整个铸件或其部分是否符合化学成分要求。 注3: 对产品的机加工件进行取样会带来一个特殊的问题，因为该件本身可能不是原始铸造化学成分的代表性样品。根据本规程取样的分析结果与铸件或铸锭浇注过程中取样的原始铸件分析结果之间可能存在较大差异。 注4: 不应使用便携式Spark-ARES和手持式XRF仪器来确定取样的零件是否符合铝协会公司注册的化学成分限制或合金的其他指定化学成分限制。 5.2 用户应注意，使用未锻造铝锭、钢坯和铸件以及成品或半成品的样品测定的化学成分可能与使用铸锭或铸件浇注时取样测定的散装化学成分不同。这种差异可能是由于凝固时的元素偏析、对铸锭或钢坯的非均匀部分进行取样、通过后续程序（如铸锭剥皮、从铸件中去除冒口或机加工）去除富集材料或凝固材料的贫化区域。 注5: 当铝凝固时，宏观偏析可能会导致整个铸锭或铸件的化学成分发生变化。相对于平均散装化学成分，某些区域可能已经提高或降低了某些元素的浓度。 宏观偏析的残留物可能会保留在成品和半成品中。本规程中描述的取样程序旨在通过对称地包括各种增强区和贫化区的方式取样，例如在圆形锭的半径上取样等，提供代表工件化学成分的实验室分析样品。

1.1 This practice describes procedures for sampling unwrought aluminum ingots, billets, castings and finished or semi-finished wrought aluminum products to obtain a representative sample for determining chemical composition. 1.1.1 Chemical compositions determined from samples obtained in accordance with this standard practice may differ from the bulk chemical composition determined from samples taken when ingots or castings are poured. These differences can be due to elemental segregation that occurs during solidification, procedures that remove enriched material (for example, ingot scalping), or procedures that remove depleted areas (for example, removal of the riser from a casting). 1.1.2 Analysis of samples obtained from unwrought aluminum ingots, billets, and castings and finished or semi-finished wrought aluminum products can be used to determine if the piece sampled meets The Aluminum Association, Inc. registered chemical composition limits or other specified chemical composition limits for the alloy. Analysis of such samples shall not supersede the analysis of samples taken during pouring of castings or ingots in accordance with Practices E716 and analyzed in accordance with Test Methods E1251 , E3061 , or EN 14242 and shall not be used for determining compliance with chemical composition requirements for an entire cast lot or part thereof. Note 1: Pieces may include ingots, forgings, coils, sheets, extrusions, castings, and so forth. A single unwrought ingot or billet may produce multiple finished or semi-finished pieces. Note 2: Certification of entire cast lots should be determined using samples taken during pouring of castings or ingots in accordance with Practices E716 and analyzed in accordance with Test Methods E1251 , E3061 , or EN 14242. 1.2 Units— The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. 1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 Products covered by this practice are unwrought aluminum ingots, billets, and castings and unclad wrought aluminum sheet, plate, rolled or cold finished extrusions, extruded profiles, wire, rod and bar. Machined wrought products (finished or semi-finished) are excluded (see Note 3 ). These practices, used in conjunction with the appropriate sample preparation techniques in Practices E716 and the Test Methods E1251 , E3061 , and EN 14242, are suitable to determine if the piece sampled meets the chemical composition limits registered with the Aluminum Association Inc. 4 or other specified chemical composition limits for the alloy. Analysis of such samples shall not supersede the analysis of samples taken during pouring of castings or ingots in accordance with Practices E716 and analyzed in accordance with Test Methods E1251 , E3061 , or EN 14242 and shall not be used for determining compliance with chemical composition requirements for an entire cast lot or part thereof. Note 3: Sampling machined pieces of products pose a particular problem because the piece itself may not be a representative sample of the original cast chemical composition. Larger differences may be expected between an analysis obtained from samples taken in accordance with this practice and the original cast analysis of samples taken during pouring of castings or ingot. Note 4: Portable Spark-AES and hand held XRF instruments should not be used to determine if the piece sampled meets chemical composition limits registered with Aluminum Association Inc or other specified chemical composition limits for the alloy. 5.2 Users should be aware that chemical compositions determined using samples taken from unwrought aluminum ingots, billets, and castings and finished or semi-finished products might differ from the bulk chemical composition determined using samples taken when ingots or castings are poured. This difference can be due to elemental segregation upon solidification, sampling a non-homogenous section of the ingot or billet, removal of enriched material, or depleted areas of solidified material by subsequent procedures such as ingot scalping, the removal of risers from castings, or machining. Note 5: When aluminum solidifies, macro-segregation may cause the chemical composition to vary throughout the ingot or casting. Certain areas may have enhanced or depleted concentrations of some elements relative to the average bulk chemical composition. Remnants of the macro-segregation may be retained in finished and semi-finished products. The sampling procedures described in this practice are designed to provide a laboratory sample for analysis which represents the chemical composition of the piece by taking samples in a way that symmetrically includes the various enhanced and depleted zones for example, sampling across the radius of a round ingot, and so forth.