Efeitos dos tratamentos térmicos de normalização, resfriamento rápido e alívio de tensões no aço ASTM A-516 grau 70, utilizado na fabricação de vasos de pressão

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)

Estudo das alterações das propriedades mecânicas em aço A-516 grau 70 soldado e submetido a tratamento térmico de alívio de tensões

Pressure vessels are equipments that require a great care because of their high cost and human life risk in case of fail, and its fabrication methods are different for each manufacturer. Normally, pressure vessels and its parts are fabricated by welding, which may change local properties of metals. The head of a pressure vessel is a very important structural component and it is fabricated by welding and mechanical conformation. Because its excellent mechanical properties, de steel A-516 Grade 70 is often used in manufacturing of large pressure vessels that are subjected to high pressure and temperature, but was verified that its mechanical resistance is decreased when submitted to a tension relief heat treatment. By experience it was defined that before mechanical conformation of the head of a large pressure vessel, the steel should be submitted to a stress relief heat treatment in order to facilitate the mechanical conformation, but there is no quantitative analysis to prove this method and study its possible risks. In the present work the steel A-516 Grade 70 demonstrated a decrease of its mechanical resistance when submitted to a stress relief heat treatment, but keeping above the minimum limit defined in the literature. By other side its ductility was substantially increased, being possible to deduce that the stress relief heat treatment before mechanical conformation is a viable e recommended technique, but with reservations. With the data acquired during the fabrication e preparation of the specimen and the result of the tests, it was possible to elaborate a welding procedure that provides the same results obtained in this present work

Die Restauration der jüdischen Gemeinden in den Jahren 538 - 516

Vorlage des Digitalisats: Theologische Zentralbibliothek in der UB Frankfurt

Predigt bei der Seelenfeier : gehalten zum Andenken des verewigten Freiherrn Amschel Maier v. Rothschild in der provisorischen Gemeinde-Synagoge zu Frankfurt a. M. (israel. Betsaal) ; Mittwoch, den 12. Dezember 1855, 3. Tevet ; Ḥanukat ha-mazbeaḥ [5]516

von Leopold Stein

Na 50 Nachlass Arthur Schopenhauer - 'Schopenhauer-Archiv', 516 - Antwortschreiben auf die Appellation in der Sache Marquet

u.a.: Caroline Marquet; Carolin Médon;

Na 1 Nachlass Max Horkheimer, 516 - Korrespondenzen mit Theodor W. Adorno (p. VI 4, 356 - 471)

150 Briefe zwischen Theodor W. Adorno, Gretel Adorno und Max Horkheimer; 1 Brief von Kurt Wolff an Theodor W. Adorno, 06.05.1965; 1 Brief von Oscar Gans an Theodor W. Adorno, 04.01.1965; 1 Brief von Theodor W. Adorno an Oscar Gans, 14.01.1965; 1 Brief von A. van Otterloo an Oscar Gans. 23.12.1964; 1 Brief von der International Martin Buber Society & Institute London an Theodor W. Adorno, 1966; 1 Mitschrift einer Sendung der Abteilung Kulturkritik des Bayrischen Rundfunkes (München), 23.02.1966; 1 Brief von Theodor W. Adorno an den Bayrischen Rundfunk (München), 28.02.1966; 1 Brief von Theodor W. Adorno an Frank Brenseler, 08.02.1966;

Ms.Ff.F.Stoltze 3. 516 - Brief von Friedrich Stoltze an Molly Schreiber

Nachrichten aus Frankfurt, Leopoldine Renwart, Fotografien, "Alte Neuigkeiten"

Planktonic foraminifera at DSDP Holes 72-516 and 72-518

Quantitative analysis was performed on the Quaternary planktonic foraminiferal fauna from Site 516, near the crest of the Rio Grande Rise, and Site 518, on the lower western flank of the Rise. From Hole 516, 46 samples were taken, and from Hole 518, 80 samples were taken. The mean interval between samples is 20 to 25 cm. About 50 species of Quaternary and Pliocene planktonic foraminifers were identified. Quaternary sediments, dated by the initial evolutionary appearance of Globorotalia truncatulinoides and other criteria, have thickness, of 9.8 m in Hole 516 and 16 m in Hole 518. The Globorotalia truncatulinoides Zone is subdivided into four subzones or biostratigraphic horizons (from lower to upper): (1) Globorotalia crassaformis viola, (2) Globorotalia crassaformis hessi, (3) Globigerina calida calida, and (4) Globigerinoides ruber (pink). Thickness of these horizons in Hole 516 establishes the age of the boundaries between them as 1.47, 0.81, and 0.28 Ma, respectively. All the Quaternary planktonic foraminiferal complexes sampled are subtropical. The region of the Rio Grande Rise, therefore, has been within the southern subtropical gyre continuously for the last 2 Ma. The average annual surface water temperatures were reconstructed for the Quaternary at both sites. A micropaleontologic method for the paleotemperature analysis of the thanatocoenosis registers an average Quaternary temperature of 21.2°C at Site 516 and 21.7°C at Site 518. The temperature fluctuations increase up to 3.5°C during the accumulation of the two last horizons (since 0.81 Ma). Temperature peaks are tentatively compared with oxygen isotopic stages and with continental glaciations. Levels at which planktonic foraminiferal species disappear correspond to coldwater intervals. In the Quaternary of Site 518, some layers show signs of dissolution. Corrosive to CaCO3, the northward flow of Antarctic Bottom Water through the Vema Channel increases during the cold periods. Site 518 has two layers of redeposited foraminiferal sand with Pliocene foraminifers. The average rate of the Quaternary sedimentation in Hole 516 is 0.52 cm per thousand years, and in Hole 518 it is 0.84 cm per thousand years.

Joaquín Rubio Tovar, La vieja diosa. De la Filología a la posmodernidad , Alcalá de Henares: Centro de Estudios Cervantinos, 2004, 516 pp.

Fil: Rodríguez Temperley, María Mercedes. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Joaquín Rubio Tovar, La vieja diosa. De la Filología a la posmodernidad , Alcalá de Henares: Centro de Estudios Cervantinos, 2004, 516 pp.

Fil: Rodríguez Temperley, María Mercedes. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.