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51317--9785-Oxidation Kinetics of Cast Alumina-Forming Austenitic Alloys in Steam

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Alloy tubes used in petrochemical processing reactor systems are often subjected to oxidizing conditions in high temperature steam such as during de-coking cycles. A new class of heat resistant austenitic cast alloys are being developed that are designed to form protective oxides of alumina.

Product Number: 51317--9785-SG
ISBN: 9785 2017 CP
Author: Benjamin Church
Publication Date: 2017
Industry: Petroleum Refining
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Alloy tubes used in petrochemical processing reactor systems are often subjected to oxidizing conditions in high temperature steam such as during de-coking cycles. The ability of the alloy to form an adherent and continuous oxide layer is critical to ensure the material resists coking and other high-temperature attack during operation. A new class of heat resistant austenitic cast alloys are being developed that are designed to form protective oxides of alumina. Experimental compositions based on a 25Cr 35Ni base composition with aluminum contents ranging from 2.6 to 3.9 wt% were fabricated via centrifugal casting. An environment of pure steam was constructed in which samples were exposed at temperatures up to 1000 °C. Oxide layers were characterized by surface and cross-sectional electron microscopy and x-ray diffraction. Oxidation charts for determining the thickness of the oxide layer were constructed based upon the time temperature and aluminium composition of the alloy. Optimal times and temperatures for oxidation processing based on each material were determined.

Key words: Stainless Steel, Austenitic Alloy, High Temperature Oxidation, Coking, Alumina

 

Alloy tubes used in petrochemical processing reactor systems are often subjected to oxidizing conditions in high temperature steam such as during de-coking cycles. The ability of the alloy to form an adherent and continuous oxide layer is critical to ensure the material resists coking and other high-temperature attack during operation. A new class of heat resistant austenitic cast alloys are being developed that are designed to form protective oxides of alumina. Experimental compositions based on a 25Cr 35Ni base composition with aluminum contents ranging from 2.6 to 3.9 wt% were fabricated via centrifugal casting. An environment of pure steam was constructed in which samples were exposed at temperatures up to 1000 °C. Oxide layers were characterized by surface and cross-sectional electron microscopy and x-ray diffraction. Oxidation charts for determining the thickness of the oxide layer were constructed based upon the time temperature and aluminium composition of the alloy. Optimal times and temperatures for oxidation processing based on each material were determined.

Key words: Stainless Steel, Austenitic Alloy, High Temperature Oxidation, Coking, Alumina

 

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Picture for High Temperature Coking Resistance of an Alumina Forming Alloy
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51317--9784-High Temperature Coking Resistance of an Alumina Forming Alloy

Product Number: 51317--9784-SG
ISBN: 9784 2017 CP
Author: Benjamin Church
Publication Date: 2017
$20.00

Coking is carbon deposition from a gas phase that is encountered in many reforming, cracking and other high temperature processes. An experimental high temperature coking atmosphere was constructed and used to evaluate the effects of temperature, time and metal surface roughness on the carbon deposition of an alumina forming alloy.

 
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51318-10877-High Temperature Alloys Failures in the Petrochemical Furnaces. Mitigation and Prevention

Product Number: 51318-10877-SG
Author: Ali H. AlShawaf / Manabendra K. Maity
Publication Date: 2018
$20.00

This paper explains the most common damage mechanisms of high temperature alloys in radiant section such as creep/carburization, thermal fatigue/carburization, and thermal shock.

 
Picture for Accelerated Corrosion of 304H SS in RFCC Regenerators Involving Low Temperature Eutectic-Forming Sal
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Accelerated Corrosion of 304H SS in RFCC Regenerators Involving Low Temperature Eutectic-Forming Salts

Product Number: 51317--8915-SG
ISBN: 8915 2017 CP
Author: Jayant Nair
Publication Date: 2017
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This article presents findings on type II high temperature (650-800ºC) corrosion in Residue Fluid Catalytic cracking (RFCC) regenerator service (alloy SS304H) and examines the possible strategies for alloy upgrade in RFCC service.
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