|Statement||by H.J. French, Senior Metallurgist, H.C. Cross, Junior Metallurgist [and] A.A. Peterson, Assistant Scientific Aid, Bureau of Standards. January 10, 1928 ..|
|Series||[United States] Bureau of Standards. Technologic papers -- no. 362|
|The Physical Object|
|Pagination||1 p. l., p. 235-267 incl. illus., tab., diagrs.|
|Number of Pages||267|
Excerpt from The Creep of Steel at High Temperatures This investigation on the creep resistance of steels was undertaken at the request of the Babcock & Wilcox Co., to provide engineering data at the higher temperatures. The work was carried out in the Department of Physics at the Massachusetts Institute of by: Books. An illustration of two cells of a film strip. Video. An illustration of an audio speaker. Audio An illustration of a " floppy disk. The creep of steel at high temperatures by Norton, F. H. (Frederick Harwood), Publication date Topics Steel Publisher New York [etc.] McGraw-Hill book company, : This implies the development of steels and alloys that can be used at high temperatures and severe conditions. These materials need to be capable of enduring long-term use. On the other hand, equipment and plants built in the s have become aged and their control requires a high degree of accuracy to ensure their safe : Springer-Verlag Berlin Heidelberg. Trans. A.S.S.T., 13, p. and p. — A study to establish some definite relation between the proportional hmit at room temperature and at high temperature. The strain at the proportional limit and the thermal expansion are used. H. J. French, H. C. Cross, and A. A. Peterson, Creep in five steels at different temperatures.
Creep-resistant steels are widely used in the petroleum, chemical and power generation industries. Creep-resistant steels must be reliable over very long periods of time at high temperatures and in severe environments. Understanding and improving long-term creep strength is essential for safe operation of plant and equipment. The creep strain at 10 5 s is on a level with the plastic strain in the temperature range of 77– K, while it is much smaller both at 4 and K. The creep strain can be prevented by pre-straining with a plastic strain larger than the estimated inelastic strain during component operation at any temperature (different from that of pre-straining). Fig. 2 The plastic strain vs. time behavior of annealed stainless steel under different stresses microstructure on low temperature creep of Ti-5 Al Sn. Metallurg Trans – Creep occurs faster at higher temperatures. However, what constitutes a high temperature is different for different metals. When considering creep, the concept of anhomologous temperature is useful. The homologous temperature is the actual temperature divided by the melting point of the metal, with both being expressed in K. In general, creep.
Steels with higher chromium content. To get sufficient corrosion and oxidation resistance at °C, it is an advantage to use chromium content in the range 20 to 25%. There are two classical high temperature steels in this range: and alloy H. Tempered martensitic steels are commonly used for power plant components at elevated temperatures up to K. In addition to the creep deformation induced by mechanical loads at the high. At room temperature, and at service load levels, creep has little effect on the performance of steel structures. However, under fire conditions, creep becomes a dominant factor and influences fire. The creep resistant steels all contain strong carbide and/or nitride forming elements. These are intended to provide a fine dispersion of precipitates that both increase the tensile strength and impede the formation of the voids illustrated in Fig 1 and Fig 2 of Job Knowledge No. Chromium is also added to reduce the scaling or oxidation of the steel at high temperatures.