1.1 这些试验方法涵盖了粒度小于0.79 mm的碳和石墨机械材料拉伸试验的仪器、试样和程序。 1.2 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。 1.2.1 例外情况- 根据原始标准，所有数字的尺寸均以英寸为单位。 1.3 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制定适当的安全、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（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 这些测试方法可用于已确定等级的碳和石墨材料的质量控制测试、新等级的开发以及相对强度水平是主要关注量的其他目的。仅当试样直径与晶粒尺寸或缺陷尺寸之比大于5时，本试验方法才适用。 4.2 这些试验方法不能替代试验方法中所述的方法 C749 ，但在不太复杂的数据和不太昂贵的技术足够的情况下是有用的。 4.3 碳和石墨材料在母体材料中表现出显著的物理性能差异。为了进行有意义的抗拉强度比较，必须指定准确的取样模式和晶粒方向。

1.1 These test methods cover the apparatus, specimen, and procedures for the tension testing of carbon and graphite mechanical materials with a grain size smaller than 0.79 mm. 1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.2.1 Exception— All of the figures are dimensioned in inches in accordance with the original 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 ====== 4.1 These test methods may be used for quality control testing of established grades of carbon and graphite materials, in the development of new grades, and for other purposes where relative strength levels are the primary quantities of interest. This test method may be applicable only if the ratio of specimen diameter to grain size, or flaw size, is greater than 5. 4.2 These test methods do not substitute for that described in Test Method C749 , but are useful where less sophisticated data and less expensive techniques are sufficient. 4.3 Carbon and graphite materials exhibit significant physical property differences within parent materials. Exact sampling patterns and grain orientations must be specified in order to make meaningful tensile strength comparisons.