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Materials selection is based on safety and economic considerations; the least expensive material securely withstanding service conditions for a required service time is chosen. For the integrity of equipment in the CPI chemical resistance is an essential factor. Of all metallic materials used for CPI equipment, tantalum is second to none regarding chemical inertness, comparing only to resistance properties of the nonmetals glass, fluoropolymers, and graphite. The price of tantalum, however, prohibits its broad application for construction. There are only two ways by which the demand for tantalum in this field can be promoted significantly. First, a major increase in the aggressivity of service conditions in process engineering caused by process development or modification. Second, cost reduction via tantalum price dilution by means of duplex systems application, utilizing the advantages of a less expensive base metal and a thin tantalum lining or coating. The more important systems of this type are discussed and evaluated regarding their potential of development. 相似文献
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Verschiebung der spannungs- und dehnungsfreien Fasern in Richtung auf den Krümmungsmittelpunkt beim Biegeversuch. Umkehr der Formänderungsrichtung nahe der Probenmitte bei zunehmender plastischer Verformung. Auswirkung dieses Richtungswechsels auf die Spannungsverteilung. 相似文献
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Zugversuche an langen Proben aus Spannstahl 145/160 mit rd. 0,45% C, 1,5% Si, 0,6% Mn, 0,4% Cr und 0,15% Cu und Ermittlung der Oleichmaßdehnung unter der Höchstkraft und nach dem Bruch. Messung der Stauchung und Aufnahme der hoch- und niederfrequenten Stoßwellen beim Bruch. 相似文献
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Härtemessungen HV 5 auf den Seitenflächen von ISO-V-Kerbschlagproben und in Schnitten parallel dazu. Verteilung der Verfestigung in Proben der Tieflage, des Mischbruchgebietes und der Hochlage. 相似文献
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Research into the Determination of the Ductility of Structural Elements in Plant Construction by Measurement on Model Vessels of Near Industrial Size— Tests on Boiler Plate Vessels (Kesselblech H 1) at Temperatures Down to ?80°C The paper deals with a research program of the Dechema working group “Materials for Chemical Apparatus”, by which an attempt is made to correlate ductility as a characteristic materials property with ductility changes to be expected in structural elements and structures. On a low temperature test stand model containers are loaded internally until bursting and the deformations of a container bottom having a complex shape are measured. Deformation and bursting pressure vs. temperature support the preliminary conclusion that the embrittlement temperature for such structures is lower than the notch toughness transition temperature of the material. Corroboration of this finding requires further work with other materials and structures. 相似文献
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