Half round steel bar is a kind of ship fender section steel, which is mainly used to protect the ship fender, increase the strength of the ship fender and reduce the impact loss of the ship. It is suitable for use on ships of 10,000 - 20,000 tons. The quantity of half round steel bar used in each ship is about 15 tons. The commonly used expression methods are diameter* radius: 30 mm*15 mm, 40 mm*20 mm, 50 mm*25 mm, 60 mm*30 mm, 75 mm*37.5 mm, 80 mm*40 mm, 100 mm*50 mm, 125 mm*62.5 mm. The size of half round steel bar is selected according to the size of the ship.