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oldcorollas Forums Junkie Location: Kita-Ku, Sapporo, Japan Registered: January 2003	Re: Copper head gaskets Wed, 19 May 2004 14:21 Syc02T wrote on Wed, 19 May 2004 22:38 Why do you put the gasket into water after heating, this will make the grains on the outer larger and therefore harder (case harden), i was under the impression to cool it slowly to get and even grain structure which will make it soft and maluable. quenching (in steels) causes smaller (but more deformed) crystals to form at the surface... vaguely.... strength is actually inversely proportional to grain size (in fully annealed state) btw, i cannot stress enough the importance if using low hydrogen atmospheres for annealing of copper. unless your head gasket is made from very low oxygen materials (like you see for snazzy speaker cables, Oxygen Free Copper=OFC) the hydrogen can cause embrittlement. basically, don't use oxy or propane torches if possible. ideally use an electric furnace. a heat treating company should be able to do this for very little cost. i don't have any info at hand as to how long embrittlement takes, but it should be avoided if possible. as for water dunking.... it doesn't appear to harden or soften the copper, but if there are oxide scales formed during heating (even tho it is a short time... copper anneals in minutes at a high enough temp) the quenching will more than likely cause spallation of the scale (ie the shit on the surface falls off ) which makes it easier to clean after. http://info.lu.farmingdale.edu/depts/met/met205/an nealingstages.html http://www.key-to-metals.com/Article25.htm http://www.key-to-metals.com/Article27.htm http://www.steamengine.com.au/ic/faq/gaskets.html http://www.headgasket.com/preinstall.html http://members.shaw.ca/turbofiero/engine_prep.htm and not really related, but about resistivity http://www.copper.org/innovations/1997/Dec1997/wir emetallurgy.html totally OT, but mentions copper http://www.homedistiller.org/materials.htm some reading for those inclined Cya, Stewart [Report message to a moderator]

	Subject	Poster	Date
	Copper head gaskets	Syc02T	Tue, 04 May 2004 02:16
	Re: Copper head gaskets	3t-RA40	Tue, 04 May 2004 03:20
	Re: Copper head gaskets	ta22gt	Tue, 04 May 2004 04:09
	Re: Copper head gaskets	barned01	Tue, 04 May 2004 04:38
	Re: Copper head gaskets	MR. 2	Tue, 04 May 2004 06:51
	Re: Copper head gaskets	RWDboy	Tue, 04 May 2004 07:18
	Re: Copper head gaskets	Syc02T	Thu, 06 May 2004 03:12
	Re: Copper head gaskets	RWDboy	Thu, 06 May 2004 03:42
	Re: Copper head gaskets	RWDboy	Thu, 06 May 2004 03:48
	Re: Copper head gaskets	oldcorollas	Wed, 19 May 2004 06:33
	Re: Copper head gaskets	Syc02T	Wed, 19 May 2004 06:42
	Re: Copper head gaskets	Syc02T	Wed, 19 May 2004 02:26
	Re: Copper head gaskets	kingmick	Wed, 19 May 2004 06:14
	Re: Copper head gaskets	celicaboy_2000	Wed, 19 May 2004 07:31
	Re: Copper head gaskets	YelloRolla	Wed, 19 May 2004 07:47
	Re: Copper head gaskets	kingmick	Wed, 19 May 2004 10:32
	Re: Copper head gaskets	Syc02T	Wed, 19 May 2004 12:38
	Re: Copper head gaskets	oldcorollas	Wed, 19 May 2004 14:21
	Re: Copper head gaskets	YelloRolla	Wed, 19 May 2004 12:56
	Re: Copper head gaskets	ed_ma61	Wed, 19 May 2004 12:59
	Re: Copper head gaskets	Syc02T	Wed, 19 May 2004 13:26
	Re: Copper head gaskets	3t-RA40	Fri, 21 May 2004 02:20
	Re: Copper head gaskets	EVOSTi	Sat, 22 May 2004 09:57
	Re: Copper head gaskets	Syc02T	Thu, 27 May 2004 03:58
	Re: Copper head gaskets	dcving	Thu, 27 May 2004 23:34
	Re: Copper head gaskets	Syc02T	Fri, 28 May 2004 04:27
	Re: Copper head gaskets	Syc02T	Sun, 06 June 2004 09:49

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