1.1 本规程涵盖了计算不规则形状耐火材料试样的面积、体积和线性变化的方法。 1.2 试样在一定长度上必须具有恒定的横截面积( L )。 1.3 以国际单位制表示的数值应视为标准。 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）。本标准的使用者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。 1.5 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====== 3.1 粘土钢浇注喷嘴和套筒按体积再热变化进行分类。某些耐火材料的膨胀导致再热尺寸不规则，难以测量。 这种做法在不依赖于物理线性测量的情况下确定体积。 3.2 具有不规则横截面的高炉检查仪按“蠕变特性”分类。这种做法决定了平均横截面面积。

1.1 This practice covers the methods of calculating areas, volumes, and linear changes of irregularly shaped refractory specimens. 1.2 The specimens must have a constant cross-sectional area over a length ( L ). 1.3 The values stated in SI units are to be regarded as the 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 establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 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 ====== 3.1 Fireclay steel-teeming nozzles and sleeves are classified by volume reheat change. Bloating of some refractories results in irregular reheat dimensions, which are difficult to measure. This practice determines the volume without depending upon physical linear measurements. 3.2 Blast furnace checkers that have irregular cross-sections are classified by “creep properties.” This practice determines the average cross-sectional area.