stainless steel question

[jistre]

This is driving me crazy, as I have a good idea of what I'm looking at and cannot find any information on the numbering of this steel I'm dealing with.

What I've got is a callout for A240 TP 304. I've got that the A240 is the ASTM standard for Chromium/Nickel stainless plate, and the 304 is the AISI specification for a low carbon austinitic plate.

What the heck is the TP? I can't find a list of those prefixes anywhere. If anyone has a list of these modifiers, I'd be much appreciative.

Thanks!

 

[metengr]

I believe TP refers to "tube or pipe", as "F" would refer to forging for the various Grades of stainless steel.

Source; page 13

http://www.astm.org/BOOKSTORE/PUBS/DS67B_SampleChapter.pdf

 

[EdStainless]

TP is for tubular product. This dates back to when the same grade (304) had different chemistry limits for different product forms.
A240 is a sheet and strip specification, it does not contain the TP designators.

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http://www.trent-tube.com/contact/Tech_Assist.cfm

 

[jistre]

Thanks for the input, folks. Helps a bunch.

 

[kenvlach]

Above are correct.
'A240 TP 304' should be 'A240 Type 304.'
The problem probably started with people (unfortunately) abbreviating Type as TY.