 Stainless H.E.'s, what grade of stainless |
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| toon1 |
 Feb 25 2009, 01:07 PM
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#1
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Senior Member  Group: Members Posts: 1,849 Joined: 29-October 05 From: tracy,ca Member No.: 5,022  |
Does anyone know what grade or type of stainless the HE's are made of?
I'm going to do some welding on them for a muffler mod. and want to setup my welder. |
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| sean_v8_914 |
Feb 25 2009, 05:28 PM
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Chingon 601 Group: Members Posts: 4,011 Joined: 1-February 05 From: San Diego Member No.: 3,541 |
call SSi and ask them. this is not a somple quetion because I think they changed amid production
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| Katmanken |
Feb 25 2009, 07:00 PM
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You haven't seen me if anybody asks... Group: Members Posts: 4,738 Joined: 14-June 03 From: USA Member No.: 819 Region Association: Upper MidWest |
There's actually 2 kinds of stainless used in them...
rusty stainless and non rusty stainless..... Rusty stainless is the pipes, Non rusty is the sheet metal... Guy I know who does metalurgy at GE aircraft engines told me, but that was at least 10 years ago and I forgot what grade..... I think the non-rusty grade is 303 or 304... The pipes????? Ken |
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| SLITS |
Feb 25 2009, 07:15 PM
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"This Utah shit is HARSH!" Group: Benefactors Posts: 13,602 Joined: 22-February 04 From: SoCal Mountains ... Member No.: 1,696 Region Association: None  |
500 has the most iron and rusts like a teener and is magnetic
400 has less and rusts less and I don't remember if it has magnetic qualities (most catalytics shells are this material I think) 300 is the shiny shit that doesn't rust and is not magnetic. |
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| jd74914 |
Feb 25 2009, 08:14 PM
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#5
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Its alive Group: Members Posts: 4,780 Joined: 16-February 04 From: CT Member No.: 1,659 Region Association: North East States |
304 stainless is pretty rust resistant, but does rust, especially in certain water environments. I would bet that the pipes are made from 316 since I haven't seen any pictures of rusty heat exchanger bodies. That grade (and up) is very resistance to rusting, even in harsh deionized water environments.
More for curiosity sake, when you do find out could you let us know what the alloy is? As far as future rust prevention is concerned, post-welding passivation is probably much more important than welding with the exactly correct alloy. If you do not passivate after welding it will rust. |
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| toon1 |
Feb 25 2009, 08:55 PM
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#6
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Senior Member Group: Members Posts: 1,849 Joined: 29-October 05 From: tracy,ca Member No.: 5,022 |
QUOTE(jd74914 @ Feb 25 2009, 06:14 PM)  304 stainless is pretty rust resistant, but does rust, especially in certain water environments. I would bet that the pipes are made from 316 since I haven't seen any pictures of rusty heat exchanger bodies. That grade (and up) is very resistance to rusting, even in harsh deionized water environments. More for curiosity sake, when you do find out could you let us know what the alloy is? As far as future rust prevention is concerned, post-welding passivation is probably much more important than welding with the exactly correct alloy. If you do not passivate after welding it will rust. What does "passivate " mean? |
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| SirAndy |
Feb 25 2009, 09:01 PM
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Resident German Group: Admin Posts: 41,641 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(toon1 @ Feb 25 2009, 06:55 PM) What does "passivate " mean? http://www.mmsonline.com/articles/how-to-p...teel-parts.aspx |
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| rjames |
Feb 25 2009, 09:04 PM
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#8
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I'm made of metal Group: Members Posts: 3,933 Joined: 24-July 05 From: Shoreline, WA Member No.: 4,467 Region Association: Pacific Northwest 
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| DBCooper |
Feb 26 2009, 06:01 AM
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#9
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14's in the 13's with ATTITUDE Group: Members Posts: 3,079 Joined: 25-August 04 From: Dazed and Confused Member No.: 2,618 Region Association: Northern California |
QUOTE(SLITS @ Feb 25 2009, 05:15 PM) 500 has the most iron and rusts like a teener and is magnetic 400 has less and rusts less and I don't remember if it has magnetic qualities (most catalytics shells are this material I think) 300 is the shiny shit that doesn't rust and is not magnetic. Don't want to seem picky, but this one hurt me. We had a customer put a magnet on a product and say "That ain't 302!" Problem is that it was. They're considered non-magnetic but a number of the 300 alloys are actually weakly magnetic, and weirdly enough get more so when they're cold-worked. Even more so when they come from China, probably. (IMG:style_emoticons/default/dry.gif) I didn't know that, got caught flat-footed, and stood there with my mouth open. And for good order's sake some will oxidize a bit, depending on grade and conditions. 316 is considered "marine grade", for example, while 302 and 304 are not for marine environments. |
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| jd74914 |
Feb 26 2009, 06:40 AM
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#10
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Its alive Group: Members Posts: 4,780 Joined: 16-February 04 From: CT Member No.: 1,659 Region Association: North East States |
(IMG:style_emoticons/default/agree.gif) Good point.
You can tell the difference between 304 and 316 by the sheen (but its hard when you don't have the 2 next to each other), and also by the fact that cheap 304 is slightly magnetic. If you run a magnet over it it usually won't pick up but you can feel the pull. Oftentimes when looking for 316 nuts for a quick fix at work I use a magnet. |
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