Hot-rolled bulb flat steel is a kind of special section steel, composed of flat webs and spherical ball heads, and is an asymmetric section steel.
Ball flat steel executive standard
The domestic production of bulb flat steel mainly implements the GB/T9945-2012 standard, and a few companies are also implementing the European standard EN10067:1996. Similar other standards include JIS G3192, ISO 657-19.
| Size(mm) | Weight (kg/m) | Size(mm) | Weight (kg/m) |
|---|---|---|---|
| 50x4(5#) | 2.26 | 180x9(18a) | 17.5 |
| 60x5(6#) | 3.38 | 180x11(18b) | 20.32 |
| 70x5(7#) | 4 | 200x10(20a) | 21.58 |
| 80x5(8#) | 4.61 | 200x12(20b) | 24.72 |
| 90x5.5(9#) | 5.55 | 220x11(22a) | 25.87 |
| 100x6(10#) | 6.81 | 220x13(22b) | 29.33 |
| 120x6.5(12#) | 8.78 | 240x12(24a) | 30.55 |
| 140x7(14a) | 11.1 | 240x14(24b) | 34.32 |
| 140x9(14b) | 13.3 | 270x12(27a) | 34.53 |
| 160x8(16a) | 14.17 | 270x14(27b) | 38.77 |
| 160x10(16b) | 16.68 |
Hot-rolled bulb flat steel is mainly used for shipbuilding and bridge building. However, with the rapid development of the shipbuilding industry in recent years, flat spherical steel has gradually become a special name for marine spherical flat steel. It is the most important type of shipbuilding steel and is mainly used as ship plate. The use of stiffeners is equivalent to a human "rib".