某水电站长期使用压力管材料强度

F. Kawamura , M. Miura , R. Ebara , K. Yanase
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引用次数: 5

摘要

在这项研究中,碳钢(JIS SS400)的材料强度进行了检查,该碳钢已用于水力发电厂的压力管约50年。通过化学成分的测定、宏观和微观组织的观察以及拉伸试验,获得了一系列数据并进行了分析。本研究表明,在一个地点测量的材料强度(0.2%抗拉强度和极限抗拉强度)不能作为整个结构的可靠代表。另一方面,等效碳含量与材料强度之间存在较强的正相关关系,表明测量等效碳含量是对材料强度的有效且合理准确的估计。此外,还讨论了包括维氏硬度在内的无损评价的潜在用途及其可靠性。在实际应用中,通过对这些有价值的现场数据进行一系列的统计分析,使我们对长期使用的压力管的材料强度有了更深入的了解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Material strength of long-term used penstock of a hydroelectric power plant

In this study, the material strength of a carbon steel (JIS SS400), which has been used for the penstock of a hydroelectric power plant for about 50 years, is examined. A series of data were obtained and analyzed by measuring the chemical compositions, observing the macro- and micro-structure and conducting tensile tests. The present study revealed that the material strength (0.2% proof strength and ultimate tensile strength) measured at one site can not be regarded as a reliable representative of the entire structure. On the other hand, strong and positive correlation between equivalent carbon content and material strength indicates that measuring the former is an effective and reasonably accurate estimate of the latter. In addition, potential use of nondestructive evaluations, including the Vickers hardness, and their reliability is discussed. In practice, a series of statistical analysis with those valuable field data provides us with the insight on the material strength of long-term used penstock.

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