Corrosion properties comparison between 201 and 301 stainless steels 2

[sierra2007]

I am interested in practical info on substituting 201 for 301 austenitic stainless steels. The application is for food service equipment components. The product form is seamless tubing. Under what conditions would you prefer 301 to 201?

 

[EdStainless]

Why seamless? All food service tubing that I have ever seen has been welded.
Why 301? Just less cost than 304?
If so then you should be OK. There is a lot of info on alloy switching on the AlleghenyLudlum web site.


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Still trying to help you stop corrosion.
formerly Trent Tube, now Plymouth Tube
eblessman@plymouth.com
or edstainless@earthlink.net

 

[kenvlach]

With 201 there is a risk of getting some poor quality foreign stuff. Also, a low-carbon grade such as 201LN from Allegheny Ludlum may be better if doing welding.

Recommended reading:
'201 Lean Substitution Options For 300 Series SS and CP-grade Titanium'

http://www.alleghenyludlum.com/docu...ons for 300 Series Alloys and CP Titanium.pdf

'THE NEW 200-SERIES : AN ALTERNATIVE ANSWER TO NI. SURCHARGE ? DREAM OR NIGHTMARE?'

http://www.euro-inox.org/pdf/map/paper/Thenew200-series_EN.pdf

 

[mcguire]

sierra2007
I helped lots of food service manufacturers switch from 304 to 201 for sheet type applications. They were(needlessly) afraid to switch for tubing because the typical soft drink customers, such as Coca Cola, were rigid about perceived potential danger to the integrity of their product. The tubing guys had no incentive to convert them so it didn't happen. 201 is fine for this use and ought to be used. It meets all requirements.
To Kenvlach's point just buy it from a reputable tubing manufacturer and get certifications.

Michael McGuire

http://stainlesssteelforengineers.blogspot.com/

 

[mcguire]

The other option you didn't mention is to use 439 tubing. It's better than 201 or 301 for corrosion, and lots of it is made for automotive applications, so it should be easily available. It's used more in Europe for food service than it is in the US.

Michael McGuire

http://stainlesssteelforengineers.blogspot.com/

 

[EdStainless]

Good thought MM. 439 is a fine material. As long as you are not forming heavily it should be fine. You may have trouble finding some product forms (no bar, no polished tubing), but it is a common sheet grade.

= = = = = = = = = = = = = = = = = = = =
Still trying to help you stop corrosion.
formerly Trent Tube, now Plymouth Tube
eblessman@plymouth.com
or edstainless@earthlink.net