A 572 Gr 50

[engpes]

What are A572 Gr 50 typical charpy impact test values are -20C?

I know this varies quite a bit, but am curious if anyone has a typical range. The typical requirement is 20 ft-lbs at this temp,i believe.

What are the odds / % that a typical US steel mill without any specific post processing would produce A572 Gr 50 with 20 ft-lb results at -20C?

 

[JStephen]

I would suggest to run this by the suppliers or mills in question.
One question is if a random sample of already-produced steel will meet the criteria.
If the quantity is large, inquire if the mill can guarantee to meet the criteria. IE, Charpy impact testing "as a condition of acceptance".
In the latter case, there may also be different grades that would meet your criteria more easily.

 

[dauwerda]

15ft-lbs absorbed energy at -20°F is the standard requirement for the utility industry, where A572 Gr. 50 and Gr. 65 are both commonly used. Typical actual test values I see range in the 25ft-lbs to 200 ft-lbs. It is pretty rare that I see anything less than 20ft-lbs but it does happen. The lowest I have seen is 9ft-lbs