管理压力容器设计的法规基于多年运行经验，主要是为了防止在静载荷条件下发生故障。这种设计理念成功地确保了充分的使用性能，因为压力容器在其预期使用寿命内通常不会受到大量负载波动的影响。然而，为了有效利用材料并提供最大的安全性和可靠性，必须确定这些结构的疲劳性能。 结构部件的疲劳寿命取决于裂纹的萌生及其扩展到临界尺寸。 本报告提供了在良性环境中以及蠕变区以下温度下运行的压力容器钢的疲劳裂纹萌生和疲劳裂纹扩展数据。

The regulations governing the design of pressure vessels are based on experience gained over many operational years and have evolved, primarily, to prevent failure under static load conditions. This design philosophy has been successful in ensuring adequate service behavior because pressure vessels are not usually subjected to large numbers of load fluctuations during their expected service life. However, the need to effectively utilize materials and to provide the utmost in safety and reliability has made it imperative to determine the fatigue behavior of these structures. The fatigue life of structural components is determined by the initiation of cracks and their propagation to critical dimensions. This report presents fatigue-crack-initiation and fatigue-crack-propagation data for pressure-vessel steels operating in a benign environment and at temperatures below the creep region.