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A good summary of various stainless steel alloys and their properties at high temp is here: http://www.azom.com/Details.asp?ArticleID=1175 . The main table of relevance from this article is reproduced below:
General summary for gasifier thermal application in ascending order of preference and price, seems to be: 304 - 321 - 310 - 253MA (2111HTR)
Table 1. Maximum service temperatures in dry air, based on scaling resistance (ref: ASM Metals Handbook)
|
|
|
304
|
870
|
925
|
309
|
980
|
1095
|
310
|
1035
|
1150
|
316
|
870
|
925
|
321
|
870
|
925
|
410
|
815
|
705
|
416
|
760
|
675
|
420
|
735
|
620
|
430
|
870
|
815
|
2111HTR
|
1150
|
1150
|
article on 321 http://www.azom.com/article.aspx?ArticleID=967
Grades 321 and 347 are the basic austenitic 18/8 steel (Grade 304) stabilised by Titanium (321) or Niobium (347) additions. These grades are used because they are not sensitive to intergranular corrosion after heating within the carbide precipitation range of 425-850°C. Grade 321 is the grade of choice for applications in the temperature range of up to about 900°C, combining high strength, resistance to scaling and phase stability with resistance to subsequent aqueous corrosion.
Grade 321H is a modification of 321 with a higher carbon content, to provide improved high temperature strength.
Another good summary of metal alloys and their performance under various thermal and industrial conditions is here:
http://www.vici.com/ref/mat_met.php
A detailed review of the properties of Inconel, here:
http://docs.twpinc.com/Inconel-alloy-600-Sept-2008.pdf
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