Pipe (Steel?) Grade Designation

[Andy49]

"all specimens shall exhibit a minimum absorbed energy
value of 27 J (20 ft-lbf) for Grade P386 (X386) and lower,
and a minimum of 54 J (40 ft-lbf) for grades higher than
P386 (X386). Weld metal shall meet an absorbed energy
value of 27 J (20 ft-lbf) minimum for all grades"

Dear All, The above paragraph is from ASME B16.49 for Induction Bends. I am guessing that P386 and X386 refer to API 5l X 56 pipe. However, I am not sure. Can someone point me to the source with the explanation? Thanks.

 

[BigInch]

Do you see it here?

http://www.steelnumber.com/en/equivalent_grades_eu.php

Independent events are seldomly independent.

 

[SJones]

P386 and X386 refer to the bend grade not the pipe. Pipe grade will be L390 or X56. Looks like somebody had a go at being a bit international and using the yield strength in MPa but going a bit awry as P is generally pressure vessel plate and the 386 doesn't match the 390 being used by API. Table 1 shows you that it does indeed mean 56 ksi SMYS.

Steve Jones
Corrosion Management Consultant

http://www.linkedin.com/pub/8/83b/b04

All answers are personal opinions only and are in no way connected with any employer.

 

[Andy49]

Thanks. Its clear now.