Maximum thickness of plates in ASTM A 572

By swnorris (****)

Date 11-05-2010 13:33

If you're referring to the Table 3.2 preq. min. preheat and interpass temp., it's 20 mm max at 32 degrees. 21 mm to 38 mm max is 50 degrees. 39 mm to 65 mm is 150 degrees. 66 mm or more is 225 degrees, with footnote "a" applying to the 20 mm max.

As far as Table 3.1, A36 20 mm or less falls into preq. Group I base metal/filler metal combinations, but over 20 mm falls into Group II.

By yyq4794 (**)

Date 11-05-2010 22:23

I checked the footnote of Table 3.2, it is
When the base metal temperature is below 32°F [O°C], the base metal shall be preheated to a minimum of 70°F [20°C] and the minimum interpass
temperature shall be maintained during welding.

Did not mention about thickness.

Second, How to know difference of Group I and Group II metal/filler comnination in Table 3.1. I can see no difference.

Thanks in advance

By Duke

Date 11-06-2010 04:31 Edited 11-06-2010 04:35

yyq4797 is referring to Table 3 and 4 in the ASTM A572; here's note B from table :

"Columbium shall be restricted to the following thicknesses and sizes unless
killed steel is furnished. Killed steel shall be confirmed by a statement of killed steel
on the test report, or by a report on the presence of a sufficient quantity of a strong
deoxidizing element, such as silicon at 0.10 % or higher, or aluminum at 0.015 %
or higher..."
And T3 thickness limits are as yyq4797 states.

Table 3 is Alloy Content.

Take a look at Table 1; Maximum Product thickness or Size... You can get 6" thick plates in Grade 42, 4" in Gr. 50.
Limited by use of non killed steels in Tables 2 and 3