Centre National De La Recherche Scientifique

Other

Université De Rouen Normandie

Manoir Industries, Inc.

Manoir Pitres

Institut National Des Sciences Appliquées Rouen Normandie

Institut National Des Sciences Appliquees De Rouen Normandie

Mathieu Couvrat

Antoine Facco

Cristelle Pareige

David Uystepruyst

Bruce Indurain Y Urricelqui

Mériem Abikchi

Sylvain Lalot

Manuel Roussel

François Beaubert

A tube for a steam cracking furnace comprising: at least one downstream tubular segment of circular section having a main diameter; at least one twisted tubular segment having a length less than a quarter of the length of the tube, and comprising: a central part with an elliptical or lobed section, having a helical pitch between one times and ten times the main diameter, and an aspect ratio of the elliptical or lobed section between 0.5 and 0.8; an upstream transition part establishing a geometric transition between the central part and a tubular segment of circular section; a downstream transition part establishing a geometric transition between the central part and the downstream tubular segment, with a fluid being intended to flow from the upstream transition part to the downstream transition part.

Tube for a steam cracking furnace having a segment with an elliptical or lobed cross section

An austenitic alloy based on nickel and having a high chromium content, intended to be used at a given operating temperature between 900&#xb0; C. and 1150&#xb0; C., comprises the following elements by mass percentage: chromium between 40% and 45%; iron between 10% and 14%; carbon between 0.4% and 0.6%; titanium between 0.05% and 0.2%; niobium between 0.5% and 1.5%; at least one reactive element, selected from rare earths or hafnium, between 0.002% and 0.1%; silicon between 0% and 1%; manganese between 0% and 0.5%; nickel to balance the alloy elements. In addition, the alloy has a molar fraction of more than 0.1% of secondary carbo-nitrides rich in niobium and/or titanium, after the operating temperature has been applied thereto. The disclosure also relates to a method for designing such an alloy and to a method for validating such an alloy.

Nickel-based refractory alloy with high chromium content and associated design method

An austenitic alloy based on nickel, chromium and iron, and having a high aluminum content, intended for use at a given operating temperature (Ts) between 900&#xb0; C. and 1200&#xb0; C., the alloy comprising the following elements, in weight percent: chromium between 20% and 32%, nickel between 30% and 60%, aluminum between 3.5% and 6%, carbon between 0.4% and 0.7%, titanium between 0.05% and 0.3%, niobium and/or tantalum between 0.6% and 2%, an element, composed of at least one rare earth and/or hafnium, between 0.002% and 0.1%, silicon between 0 and 0.5%, manganese between 0 and 0.5%, tungsten between 0 and 2%, and iron as the balance of the elements in the alloy. The alloy has less than 1% by volume of an intermetallic B2-NiAl phase and less than 1% by volume of an alpha prime phase rich in chromium, after subjecting the alloy to an operating temperature (Ts).

Austenitic alloy with high aluminum content and associated design process

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Pitres, France

Mathieu Couvrat