Standard Chart of Low-Carbon Steel Defects (GBT1979-2001) 18
Wallchart of the criteria for rating structural steel for low-multiple organizational defects (gb/t1979-2001) 18
Figure I Rating diameter or edges less than 40 mm
Figure II Ratings 40-150 mm in diameter or edge
Figure III Ratings 150-250 mm in diameter or by edge
Figure IV Ratings 250 mm in diameter or by edge
Figure VI Ratings All sizes, steel








