1.1 这些试验方法包括化学成分在以下范围内的铌铁的化学分析: 要素 作文 % 铝 最大2.00 碳 最大0.30 铬 最大2.00 钴 最大0.25 领导 最大0.01 锰 最大3.00 铌 40.00至75.00 磷 最大0.05 硅 最大4.00 硫黄 最大0.03 钽 最大7.00 锡 最大0.15 钛 最大5.00 钨 最大0.50 1.2 试验方法按以下顺序出现: 小节 用离子交换试验方法分离铌、钽和钛 15和 16 钛的分光光度试验方法[0.05 % 至5.0 %] 17 – 21 用重量法测定铌[40 % 至75 %] 22 – 23 重量法测定钽[1 % 至7 %] 24 – 25 钽的分光光度试验方法[0.25 % 至1 %] 26 – 30 1.3 单位- 以国际单位制表示的数值应视为标准值。本标准不包括其他计量单位。 1.4 本标准并非旨在解决与其使用相关的所有安全问题（如有）。 本标准的用户有责任在使用前咨询并建立适当的安全、健康和环境实践，并确定监管限制的适用性。第节给出了具体的危险说明 6. ，以及中的特定警告声明 11.1 . 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）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》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 这些铌铁合金化学分析的试验方法主要用于测试此类材料是否符合成分规范，如规范 A550型 . 假设所有使用这些测试方法的人都是经过培训的分析员，能够熟练、安全地执行常见的实验室程序。 预计工作将在配备适当的实验室中进行。

1.1 These test methods cover the chemical analysis of ferroniobium having chemical compositions within the following limits: Element Composition, % Aluminum 2.00 max Carbon 0.30 max Chromium 2.00 max Cobalt 0.25 max Lead 0.01 max Manganese 3.00 max Niobium 40.00 to 75.00 Phosphorus 0.05 max Silicon 4.00 max Sulfur 0.03 max Tantalum 7.00 max Tin 0.15 max Titanium 5.00 max Tungsten 0.50 max 1.2 The test methods appear in the following order: Sections Separation of Niobium, Tantalum, and Titanium by the Ion-Exchange Test Method 15 and 16 Titanium by the Spectrophotometric Test Method [0.05 % to 5.0 %] 17 – 21 Niobium by the Gravimetric Test Method [40 % to 75 %] 22 – 23 Tantalum by the Gravimetric Test Method [1 % to 7 %] 24 – 25 Tantalum by the Spectrophotometric Test Method [0.25 % to 1 %] 26 – 30 1.3 Units— The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 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 consult and establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific hazard statements are given in Section 6 , and specific warning statements in 11.1 . 1.5 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 ====== 4.1 These test methods for the chemical analysis of ferroniobium alloy are primarily intended to test such materials for compliance with compositional specifications such as Specification A550 . It is assumed that all who use these test methods will be trained analysts capable of performing common laboratory procedures skillfully and safely. It is expected that work will be performed in a properly equipped laboratory.