Dear
-- I have a question about my Inspection Certificate of pipe fitting.
We order of material for low temperature ASTM A420 Gr. WPL6.
But, in hard stamp and certificate is "WPL6/WPB" (Attached)
Where i know, for WPB is ASTM A234.
what is the product can used for Low Temperature Service -45degree Celcius???
and if true, any one know reference from standard ASTM???
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