Someone who understands exhaust tubing or metals... input needed please...
02-28-2001, 08:56 AM
#1
Someone who understands exhaust tubing or metals... input needed please...
I've been talking to a local exhaust fabricator about my downpipe, and he mentioned something I had not heard before: that stainless steel can become brittle and crack when subjected to heat repeatedly. He went on to say that many exhausts that are supposedly "Stainless Steel" are actually a mix of stainless and some other metals, therefore resisting corrosion and heat failure.
Also, he carries some tubing called "Aluminized" wich I gather means steel coated for rust protection.
Anyone who knows something about metals and their properties care to comment? Is "Stainless Steel" tubing actual a hybrid metal? Forgive my ignorance here, but I'm looking for some expert advice before I go talk to the exhaust guy again.
Also, he carries some tubing called "Aluminized" wich I gather means steel coated for rust protection.
Anyone who knows something about metals and their properties care to comment? Is "Stainless Steel" tubing actual a hybrid metal? Forgive my ignorance here, but I'm looking for some expert advice before I go talk to the exhaust guy again.
02-28-2001, 09:20 AM
#2
Evan...go to link..scroll to page bottom and hit 'Student Information' hot button...
<ul><li><a href="http://www.ssina.com/stainless.html">http://www.ssina.com/stainless.html</a</li></ul>
02-28-2001, 10:24 AM
#4
I believe tubing is 304...not sure about muffler casing or innards..
the exhaust temps will not get close to temp deg limits specs for 304..but I do know what your exhaust fabricator was talking about...but was on a rather expensive outside grill. Natural gas type with SS racks for briquettes...after one season of use (searing those steaks etc)clean grill and the racks were so brittle they crumbled in your hands...SS to carbon.
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02-28-2001, 02:34 PM
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for downpipe use 321 stainless steel...for the rest of the exhaust system 304 is fine
most SS aftermarket exhaust systems use 304 SS.
For high temp applications like turbo downpipes, turbo exhaust manifolds, etc...use 321 SS
and if you don't mind spending the bucks you can even get inconel tubing...the ultimate in high temp stuff
Use 347 filler rod to weld 321 to 321
Use 308 filler rod to weld 321 to 304
Use 309 filler rod to weld 321 to mild steel
Rukman
For high temp applications like turbo downpipes, turbo exhaust manifolds, etc...use 321 SS
and if you don't mind spending the bucks you can even get inconel tubing...the ultimate in high temp stuff
Use 347 filler rod to weld 321 to 321
Use 308 filler rod to weld 321 to 304
Use 309 filler rod to weld 321 to mild steel
Rukman
02-28-2001, 03:22 PM
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more info..321 or 347 will work..321 more available
Within the 300 series of stainless steels, there are four types: 304, 316L, 321, and 347.
321 and 347 are known as stabilized grades of stainless. These are alloyed with either titanium (321) or columbium (347)
Both 321 and 347 are good choices for turbo applications but 321 is more available
316L is an extra low carbon (ELC) grade of stainless that has only .03% carbon It is used in marine exhausts
321 and 347 are known as stabilized grades of stainless. These are alloyed with either titanium (321) or columbium (347)
Both 321 and 347 are good choices for turbo applications but 321 is more available
316L is an extra low carbon (ELC) grade of stainless that has only .03% carbon It is used in marine exhausts
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