Bulb flats (Canai Panas)
USA - ASTM - A572 - 50 
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|Standard sectional dimension|
Bulb flats, or Dutch profiles, are long, hot rolled flats with a rounded bulb along one edge/side, which gives the flat section strength.
The main application is for stiffening plates in shipbuilding, but they are also used in bridge construction. Bulb flats provide good resistance to buckling and can offer a better strength-to-weight ratio than stiffeners such as steel bars and asymmetric angles.
The rounded profile of bulb flats offers and a good surface for paints to adhere to – an important factor in highly corrosive environments such as the ocean.