Max Temp of Stainless Steels

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sharjeelfaiz Participant Join Date: Feb 2008 Posts: 4	Max Temp of Stainless Steels 02/22/2008 1:59 AM
	Hello! In ASME Sec II, the allowable stress values go on decreasing with temperature? So at what temperature do we draw the line and stop using that material? What is the maximum temperature to which different grades of stainless steel can be used as per ASME Sec. II? Regards, Sharjeel Aslam Faiz
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phoenix911 Guru Join Date: Aug 2007 Posts: 23647 Good Answers: 420	#1 Re: Max Temp of Stainless Steels 02/22/2008 9:48 AM
	It has been a while since I worked with ASME standards. But I believe that would depend on the working pressure and temperature that the pressure vessel would be put through. And it would be the call of the design engineer of the project. Sorry I can't give actual numbers or a positive answer. Ask you Authorized Inspector opinion, could be more helpful. __________________ “ When people get what they want, they are often surprised when they get what they deserve " - James Wood
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Codemaster Guru Join Date: Jul 2005 Location: Stoke-on-Trent, UK Posts: 4496 Good Answers: 137	#2 Re: Max Temp of Stainless Steels 02/22/2008 10:23 AM
	I haven't got ASME 8 or the EN equivalent in front of me, but I'd take max temp as the highest temp in the tables for which an allowable stress is stated. Codey __________________ Give masochists a fair crack of the whip
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Abdel Halim Galala Guru Join Date: Feb 2007 Location: Cairo, Egypt Posts: 1733 Good Answers: 248	#3 Re: Max Temp of Stainless Steels 02/23/2008 7:55 AM
	ASME code, Section II, Part D includes a tables such as Table 1A & Table 1B for finding the Allowable Tensile Strength of material S. We note that depending on temp. there is an allowable tensile strength S, so it is permitted to use that S at the specified temp. in the design equations. From these tables, there is a column including the Applicability and Max. Temp. Limits for each grade of material. Also from the tables you can find the min. temp. limits. Also there are a notes at tail of each table to be taken into consideration. From a lot of piping and vessel handbooks, you can find the cryogenic temp. where we can use the stainless steel grades. __________________ It is better to be defeated on principles, than to win on lies!
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Anonymous Poster	#4 Re: Max Temp of Stainless Steels 02/25/2008 7:31 AM
	You stop where the table stops and where the allowable stress is so low you cannot make the vessel wall thick enough to withstand the pressure. Read the notes. As the temperature increases in 300 series stanless steel after you exceed 1000°F you must go to "H" grade material or at least materials with .04% minimum carbon. It is very important to read the notes and the column that indicated what section of the code is applicable to the grade of material you are looking for. If you need to go above 1500°F consider the 800H & 800 HT inconel material. These are listed with the "SB" prefixes in the code. Always adhere to the notes and temperature limits. M. Morgan ability@ameritech.net
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