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General Category => Equipment and Software => Topic started by: skepace on September 12, 2012, 08:22:17 PM

Title: 201 or 304 Stainless Steel
Post by: skepace on September 12, 2012, 08:22:17 PM
So I found a large stock pot that I can convert to a brew kettle since a buddy of mine can weld stainless steel.  But it is 201 stainless and not 304 like most kettles I see for sale.

Is there a big difference?  I know price to buy is about half. 

Thanks!
Title: Re: 201 or 304 Stainless Steel
Post by: hopfenundmalz on September 12, 2012, 08:33:48 PM
Most everything I have is 304. Looking up on mr. google, it says 201 is low nickel, and not as weldable as 304.

Hope this helps.
Title: Re: 201 or 304 Stainless Steel
Post by: skepace on September 12, 2012, 08:43:21 PM
That would be a bummer!
Title: Re: 201 or 304 Stainless Steel
Post by: brewgyver on September 18, 2012, 11:46:51 PM
That would be a bummer!

Indeed it would.  Stick with 304.  Also best not to mix fittings/parts of different alloys, eg 304 and 316.  I know they used different filler rod.
Title: Re: 201 or 304 Stainless Steel
Post by: harbicide on September 20, 2012, 05:05:26 PM
Indeed it would.  Stick with 304.  Also best not to mix fittings/parts of different alloys, eg 304 and 316.  I know they used different filler rod.

304 and 316 can both be welded with Type 308 filler metals.  304 can be welded with 316.

For the base question, 201 contains probably about the same amount of chromium as a cheap chinese made 304 does.  With manganese replacing nickel it is known as the cheap man's austenitic.

From the Allegheny Ludlum website:
Welding
ATI 201 HP™ and ATI 201L HP™ can be welded by all conventional methods applied to 18 percent chromium, 8 percent nickel steels. Filler wire or electrodes of the conventional chromium-nickel analyses can be used. Like other chromium-nickel 300 series austenitic stainless steels where carbon is not controlled below 0.03%, ATI 201 HP™ alloy is sensitive to intergranular corrosion in the weld heat affected zone.
Title: Re: 201 or 304 Stainless Steel
Post by: morticaixavier on September 20, 2012, 05:43:05 PM
Indeed it would.  Stick with 304.  Also best not to mix fittings/parts of different alloys, eg 304 and 316.  I know they used different filler rod.

304 and 316 can both be welded with Type 308 filler metals.  304 can be welded with 316.

For the base question, 201 contains probably about the same amount of chromium as a cheap chinese made 304 does.  With manganese replacing nickel it is known as the cheap man's austenitic.

From the Allegheny Ludlum website:
Welding
ATI 201 HP™ and ATI 201L HP™ can be welded by all conventional methods applied to 18 percent chromium, 8 percent nickel steels. Filler wire or electrodes of the conventional chromium-nickel analyses can be used. Like other chromium-nickel 300 series austenitic stainless steels where carbon is not controlled below 0.03%, ATI 201 HP™ alloy is sensitive to intergranular corrosion in the weld heat affected zone.

ahh well that makes it clear  ;D
Title: 201 or 304 Stainless Steel
Post by: ckpash88 on September 22, 2012, 06:08:57 AM
You can weld stainless with regular mild steel wire or filler rod it will just rust at the weld. You can mix different alloys but it'll make interesting looking welds. I would say go for it and if it doesn't work get a different pot.


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Title: Re: 201 or 304 Stainless Steel
Post by: micsager on October 10, 2012, 03:25:55 PM
John Palmer goes into metals quite extensively on an old Brewstrong episode.  And he's an expert in metals, so it must be good data.