In order to meet the different needs of the structure of each part of the hull, marine steel mainly has the following types in actual application:
1. Steel plate
Steel plate (plate) is the main component of the hull structure, accounting for about 60%-65%, such as hull plate, deck plate and subdivision partition. Generally, steel plates with a thickness of 4mm and below are called thin plates, and those with a thickness of 4mm or more are called thin plates. Thick plate. The size range of marine steel plates is generally: thickness 6-40mm, width 1 200b3 000rDATI, length 6000, 14000mm.
2. Section steel
The proportion of standard steel section in the hull structure is second only to the steel plate, about 35%-40%, and is mainly used as the hull frame. According to its cross-sectional shape, it can be divided into flat steel, spherical flat steel, angle steel, I-beam, T-shaped steel and channel steel.
3. Cast steel and forged steel
Ship's bow and stern columns, anchors, fairleads, bollards, and stern tubes are often made of cast steel (casting), while ship rudder stocks, shafts and other simple-shaped components often use forging steel (forging).
