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Old 01-07-2003, 07:15 PM   #1
fengshui-fu
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Default The properties of 321 stainless steel vs 304 as seen in exhausts

Stainless Steel - Grade 321:
http://www.azom.com/Details.asp?ArticleID=967

Stainless Steel - Grade 304:
http://www.azom.com/details.asp?Arti...Grade%2B304%2B

Good read and something to think about with the advent of all these 321 stainless steel exhaust components entering the market.

Enjoy.

chris
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Old 01-07-2003, 07:33 PM   #2
gravel
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Default 321 is the better choice for the uppipe then

so basically 321 is the better choice for the uppipe and the 304 should be okay for the turboback.

I believe Shiv was the first to use 321 in the uppipe - way to go Shiv.
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Old 01-07-2003, 11:56 PM   #3
tuca33
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What is the temperature inside a WRX uppipe?
Thanks
Tuca
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Old 01-08-2003, 12:04 AM   #4
jrexilius
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I think =< 1600F so which is ~850C I think.. so, yeah, its within the specs for 321..

oh yeah.. i think I heard that exhaust temps are ~800F which is ~450C which is also below the 500C limit for 304..

good post fengshui-fu
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Old 01-08-2003, 12:45 AM   #5
xstar
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so what's the metal in the stock uppipe?
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Old 01-08-2003, 12:57 AM   #6
tuca33
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Cast Iron,,But is much Heavier..
Tuca
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Old 01-08-2003, 01:10 AM   #7
fengshui-fu
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My pleasure. Im considering either the perrin UP or the APS ones, both 321 SS. And even though it is overkill, ill probably get the perrin DP to compliment my UP and crnak pulley and IC hoses. ALL PERRIN!!

chris
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Old 01-08-2003, 01:16 AM   #8
xstar
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so cast iron is as resistant to really high operating temperatures? anyone know how high?

I just want a baseline to compare the 321 and 304 metals.

thanks.
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Old 01-08-2003, 01:27 AM   #9
tuca33
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Hey,,i Have a scooby sport 304..
is that really bad???I am nervous..
Will it be much much better to jet coat it??
Do you think the 304 is enough?
Tuca
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Old 01-08-2003, 01:36 AM   #10
fengshui-fu
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I wouldnt worry unless you are going for mad power and actually change out your headers. If you do a header swap, then you might want to consider the 321 SS.

chris
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Old 01-08-2003, 01:52 AM   #11
mlambert
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it doesnt hurt that the perrin up/down pipes look nice either
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Old 01-08-2003, 11:03 AM   #12
nhluhr
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Quote:
Originally posted by tuca33
Cast Iron,,But is much Heavier..
Tuca
i don't think so... i've seen many stock uppipes and they never struck me as being a cast piece but i'm doing another uppipe install today so i'll pay attention to that specifically...
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Old 01-08-2003, 11:50 AM   #13
sweetsuby
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304 is fine for either uppipes or downpipes. Although the gasses reach 1550 degrees the pipe never actually gets that hot.
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Old 01-08-2003, 12:58 PM   #14
gravel
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The issue is with the number of heating cycles and maintained corrosion resistance and resistance to mechanical fatigue.
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Old 01-11-2003, 08:38 PM   #15
jrexilius
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tuca33: jet coating inside and out will be an improvement. I am planning on doing just that even though i will have a 321 steel up-pipe.
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