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Up Topic Welding Industry / General Welding Discussion / A36 Modified
- - By bmaas1 (***) Date 12-05-2005 18:20
What makes "A36 modified", if anything, different than A36? Or is it that this particular A36 just happened to test out at higher mechanicals than regular A36?

Brian
Parent - By chall (***) Date 12-05-2005 18:39
I'm looking at the 2001 ASTM for A36. The term modified doesn't appear in any description of the properties of the material.

My guess would be that it refers to invoking one of the "Supplemental" Requirements. One is a Charpy requirement and the other is a limitation on rimmed or capped steel.

I would look the MTR over and see if there are any Charpy impact results.

Just my opinion.
Charles
Parent - - By chall (***) Date 12-05-2005 18:51
By the way, what makes you call this material modified?

Charles
Parent - - By bmaas1 (***) Date 12-05-2005 19:01
I think this is just a slang term I've heard around here.

Brian
Parent - - By chall (***) Date 12-05-2005 19:11
I had the thought that maybe it was A-36(M). In this case the "M" means metric units, not modified.

Just a thought.
Parent - By bmaas1 (***) Date 12-05-2005 19:19
In my opinion A36 modified doesn't exist. It just tested out higher.

Brian
Parent - - By jwright650 (*****) Date 12-05-2005 19:20
We refer to it as an A36 that has MTR's that support considering it for a 50ksi application.
John Wright
Parent - - By bmaas1 (***) Date 12-05-2005 19:39
It just drives me nuts when people refer to it as A36 modified.

Brian
Parent - - By qcman74 Date 12-05-2005 21:56
A36Mod is A36 mat'l that has a Carbon Content of .20 or less and a Maganese content between .80 and 1.2. I have also seen somewhere that for each reduction of .01 of Carbon you can increase your Maganese by .06 up to a max Maganese content of 1.35.
Parent - By chall (***) Date 12-05-2005 22:01
What reference gives you the information regarding .20 max carbon?

As for your other comment, Table 2, Chemical Requirements, lists that as a note for Plate material. There is no mention of the .20 carbon though.

Thanks
Charles
Parent - By G.S.Crisi (****) Date 12-06-2005 12:12
Very interesting dialog, in which I can't take part because the newest edition of ASTM standards we've got here at Mackenzie University library is from 1996.
qcman74's statement makes sense and justifies calling that steel a "Modified A-36", because the carbon content has decreased and the manganese has increased to compensate for it.
To further discuss this matter you gentlemen should have on hand the latest edition of the ASTM book, otherwise the discussion would be based on a standard that's possibly obsolete.
Giovanni S. Crisi
Sao Paulo - Brazil
Parent - - By TimGary (****) Date 12-06-2005 16:33
Check out this past topic

http://www.aws.org/cgi-bin/mwf/topic_show.pl?id=7952#37502
Parent - By bmaas1 (***) Date 12-06-2005 16:35
Thank you

I had forgotten that I had posted before.

Brian
Up Topic Welding Industry / General Welding Discussion / A36 Modified

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