BBN steel made analysis for the unqualified internal structure and law detection of ASTM A387 Grade 22 Class2/ASTM A387Gr22CL2 steel plates by means of metallography and scanning electron microscope. As a result, the microcracks caused by inclusions is the main reason for the flaw detection failure of ASTM A387 Grade 22 Class2/ASTM A387Gr22CL2 steel plates.
In order to improve the qualification rate of flaw detection for ASTM A387 Grade 22 Class2/ASTM A387Gr22CL2 steel plates, there are some methods to reduce the superheat of molten steel are put forward. For example, dynamic soft reduction technology, billet and steel plate stacking and slow cooling 48h, etc.
ASTM A387 Grade 22 Class2/ASTM A387Gr22CL2 steel plates need to be produced in strict line with ASTM A387/A387M pressure vessel steel plates standard. They usually need ultrasonic flaw detection to detect quality defects inside the ASTM A387Gr22CL2 steel plates/ ASTM A387 Grade 22 Class2 steel plates.
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