1.1 本试验方法用于测定从耐火砖或型材上切割并进行热循环的棱柱形试样的强度损失或连续性降低或两者兼有。 1.2 强度损失通过未循环试样和热循环试样之间的断裂模量（MOR）差来测量。 1.3 通过热循环前后声速的差异来估计结构连续性的降低。 1.4 以英寸-磅为单位的数值应视为标准值。括号中给出的值是到国际单位制的数学转换，仅供参考，不被视为标准值。 1.5 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。 1.6 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====== 3.1 本试验方法表明耐火产品承受温度突然变化产生的应力的能力。 3.2 因为本循环试验的推荐炉温为1200 °C（2190 °F），本试验方法可能无法表明耐火产品在较高或较低温度下承受循环的能力，尤其是当耐火产品的现有形态发生变化时。 3.3 该测试方法有助于研究和开发，以及比较耐火产品。 出于规范目的使用该测试时，应考虑精度。 3.4 坚固性测试发现以下变量坚固: 温度 +5 °C 热间距 1. / 2. 到 3. / 4. 在里面（12.77至19毫米） 冷间距 1. / 2. 到 3. / 4. 在里面（12.77至19毫米） 杆的中心抓取与末端抓取 热保持时间 10到15分钟 冷保持时间 10到15分钟 操作员空气速度 0至2英里/小时（0至3.2公里/小时） 初始冷或热样品 后进先出（LIFO）；或先进先出（FIFO） 从熔炉中移除 MOR测试期间，锯切或原始表面作为拉伸面 钢筋厚度 0.96至1.04英寸。（24.5至26.4毫米）

1.1 This test method is used for determining the strength loss or reduction in continuity, or both, of prism-shaped specimens which are cut from refractory brick or shapes and subjected to thermal cycling. 1.2 The strength loss is measured by the difference in modulus of rupture (MOR) between uncycled specimens and the specimens subjected to thermal cycling. 1.3 The reduction in structural continuity is estimated by the difference in sonic velocity before and after thermal cycling. 1.4 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. 1.5 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. 1.6 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 This test method indicates the ability of a refractory product to withstand the stress generated by sudden changes in temperature. 3.2 Because the recommended furnace temperature of this cycling test is 1200 °C (2190 °F), this test method may not indicate the ability of a refractory product to withstand cycling at higher or lower temperatures, especially if the existing morphology of the refractory product changes. 3.3 This test method is useful for research and development, as well as for comparing refractory products. The precision should be considered when using this test for specification purposes. 3.4 Ruggedness tests found the following variables to be rugged: Temperature +5 °C Hot spacing 1 / 2 to 3 / 4 in. (12.77 to 19 mm) Cold spacing 1 / 2 to 3 / 4 in. (12.77 to 19 mm) Center versus end gripping of the bars Hot hold time 10 to 15 min Cold hold time 10 to 15 min Operator air speed 0 to 2 mi/h (0 to 3.2 km/h) Initially cold or heated samples Last in, first out (LIFO); or first in, first out (FIFO) removal from the furnace Sawed or original surface as tensile face during MOR testing Bar thickness 0.96 to 1.04 in. (24.5 to 26.4 mm)