Server maintenance is scheduled for Saturday, December 21st between 6am-10am CST.

During that time, parts of our website will be affected until maintenance is completed. Thank you for your patience.

Menu
Search
Filters
Close
Menu

Use GIVING24 at checkout to save 20% on eCourses and books (some exclusions apply)!

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

Picture for Oxidation Kinetics of Cast Alumina-Forming Austenitic Alloys in Steam
Available for download

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
$0.00
$20.00
$20.00

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

 

Product tags
Also Purchased
Picture for High Temperature Coking Resistance of an Alumina Forming Alloy
Available for download

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.

 
Picture for High Temperature Alloys Failures in the Petrochemical Furnaces. Mitigation and Prevention
Available for download

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
Available for download

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
$20.00

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.
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support