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Discussion Forums - The Hendrix Group
HomeHomeDiscussionsDiscussionsMaterial Select...Material Select...A36 at high temperatureA36 at high temperature
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6/23/2006 9:00 AM
 
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My company is considering using ASTM A36 plate for in an application where temperatures between 1000 - 1100 F are normal (engine exhaust). Our competitors, we are told, use "carbon steel" so we are looking into the issue. The unit, (36" round x 24" lg, 12 ga) does not see any load other than an internal pressure of about 1-2 psi (27 - 50 in H2O) but is exposed to pulsing by engines and to the engine's products of combustion. We realize that the material is susceptible to thermal oxidation and carburization but the question is, how long will it take to failure? Could we get a couple of years out of the steel? What would be failure modes? Could welds develop cracks more readily? Does welding quality become crucial? Thanks for your help. So many books So little time
 
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6/28/2006 9:00 AM
 
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mrlayneo1: It's not possible to predict the life of the A36 component with the information you supplied. As you suggested, potential damage mechanisms may include oxidation, (possibly sulfidation and/or carburization, depending on the excess air in the flue gas), thermal cracking, warping, etc. Welds may be critical and should be full penetration with no significant geometric stress raisers. You understand that the strength of A36 is going to be much reduced at 1000-1100F. Hope this helps! David Hendrix The Hendrix Group Inc.
 
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6/28/2006 9:00 AM
 
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What information would be required?
 
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7/3/2006 9:00 AM
 
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Mr. Laneo... Have you considered using a type of ferritic or austenitic stainless steel, similar to the grades used in the automotive industry ? As I understand, austenitic and types SUS304, 409 and 439 have been used. Type 439 is commonly used where there is more O2 in the gas stream.... See these websites: http://www.aksteel.com/pdf/markets_products/carbon/Aluminized_409-439_Data_Bulletin.pdf http://www.aksteel.com/pdf/markets_products/stainless/ferritic/439_LT_Data_Sheet.pdf http://www.alleghenyludlum.com/ludlum/pages/products/xq/asp/G.3/qx/ProductLine.html How long do you want this system to last ??? My opinions only... -MJC
 
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