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SilverGhost Forums Junkie Location: Sydney Registered: September 2004	Re: 3SGTE headers.. Thu, 01 September 2005 09:00 terra wrote on Thu, 01 September 2005 07:37 ss automotive are HORRIBLE, their welds are crap and crack easy, they use cheap stainless steel (you want marine grade which not many places use) I assume your referring to Stainless Steel Type 316 for food, surgical stainless and marine steel uses; The Alloy addition of molybdenum is added to prevent specific forms of corrosion.... My only question is what does lack of corrosion have to do with a blend of Stainless which can be heat treated. 316, or for that matter all 300 series Austentic Stainless employs a iron-chromium-nickel alloy which makes them ideal for surgical instruments and cutlery, but can be either annelaed or case hardened with the addition of extreme heat, and metallurgy 101 says hardened metals are more brittle....who wants a brittle exhaust?? not me.... Type 409 is the cheapest type of Stainless alloy; used for automobile exhausts is Ferritic in nature i.e. (iron/chromium only). Ferritic stainless steels are still highly corrosion resistant, but arent quite as durable than austenitic grades. But the main advantage is they cannot be hardened by heat treatment which means an exhaust that will be rapidly heated and cooled many hundreds of times over the next few years will retain the same metallurgical charateristics as the day it was first fabricated. I for one am glad i didnt buy a 'marine grade' stainless exhaust, but then again i am new to all of this bizzo.... [Updated on: Thu, 01 September 2005 09:02] [Report message to a moderator]

	Subject	Poster	Date
	3SGTE headers..	EVL-184	Mon, 29 August 2005 13:27
	Re: 3SGTE headers..	SilverGhost	Tue, 30 August 2005 09:29
	Re: 3SGTE headers..	Aust162	Tue, 30 August 2005 11:14
	Re: 3SGTE headers..	RWDboy	Wed, 31 August 2005 13:40
	Re: 3SGTE headers..	terra	Wed, 31 August 2005 21:37
	Re: 3SGTE headers..	1gt48u	Thu, 01 September 2005 06:37
	Re: 3SGTE headers..	terra	Thu, 01 September 2005 09:07
	Re: 3SGTE headers..	SilverGhost	Thu, 01 September 2005 09:19
	Re: 3SGTE headers..	SilverGhost	Thu, 01 September 2005 09:00
	Re: 3SGTE headers..	berad	Thu, 01 September 2005 05:12
	Re: 3SGTE headers..	Toobs	Thu, 01 September 2005 09:29
	Re: 3SGTE headers..	SilverGhost	Thu, 01 September 2005 09:33
	Re: 3SGTE headers..	Toobs	Thu, 01 September 2005 12:46
	Re: 3SGTE headers..	berad	Thu, 01 September 2005 09:43
	Re: 3SGTE headers..	DamMR2T	Fri, 02 September 2005 03:57
	Re: 3SGTE headers..	Aust162	Fri, 02 September 2005 09:14
	Re: 3SGTE headers..	SilverGhost	Fri, 02 September 2005 09:59
	Re: 3SGTE headers..	EVL-184	Fri, 02 September 2005 10:55

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