Due to the harsh working environment of the ship, the hull shell is subject to chemical corrosion of seawater, electrochemical corrosion and corrosion of marine organisms and microorganisms; the hull is subjected to large wind and wave impacts and alternating loads; the shape of the ship is complicated by processing methods, etc. Steel for hull structure is strictly required. First of all, good toughness is the most critical requirement. In addition, high strength, good corrosion resistance, weldability, forming properties and surface quality are required.
Shipbuilding Steels Our hot rolled shipbuilding steel is produced in accordance with the relevant Classification Society, examples of which include Lloyds Register and Det Norske Veritas.
Our steel products include steel shipbuilding plate, fabricated steel sections and floor plate for decking. We can also supply bulb flats for plate stiffening, structural steel angles and inverted angles.
Our plates are supplied under the ASTM/ASME specification (ASTM A131 / ASME SA 131) which is the standard specification for Structural Steel for Ships. We offer higher strength shipbuilding steels as standard .High strength steels offer significant cost advantages by reducing the weight of the structure in comparison to the steel used.
The plates are suitable for use in the construction of container ships and large cargo freighters as well as commercial shipping lines such as luxury cruise ships and ferries. Supply options include heavy plates, surface treated plates and pre-fabricated sections. In most cases, the steel can also be supplied as hot rolled coils or cut into lengths (sheets).
These high yield materials are commonly used in the construction of hulls and superstructures for large shipping vessels. The grades are exclusively for shipbuilding use as set out in the standard.
Marine Steel Plate,Ccs Marine Steel Plate,Ship Building Steel Plate,Ah36 Marine Steel Plate Shandong Guanzhou Iron and Steel Group Co., Ltd , https://www.shansteelsupply.com
The CSP finishing rolling mill reducer adopts helical gear transmission. If the gear clearance is large, that is, the actual center distance of the gear is greater than the standard center distance, the meshing angle of the gear becomes larger. When the helix angle is constant, the end face of the gear The meshing angle also increases. The degree of coincidence of the helical gear is the sum of the coincidence degree of the end face and the degree of coincidence of the axial direction. When the meshing angle of the end face of the helical gear becomes larger, the degree of coincidence of the end face is reduced, resulting in a smaller degree of coincidence of the helical gear. The coincidence degree of the gear is an important condition for ensuring the continuous meshing of the gear. The greater the degree of coincidence, the smoother the transmission, and if the degree of coincidence is reduced, the smoothness of the gear is reduced. That is, the degree of coincidence of the meshing of the gears becomes larger.
Taking the F1 reducer as an example, when rolling ordinary steel, the rolling force of the pumping unit reducer is about 38000KN, and the rolling force of the rolled sheet and the special type steel can reach 45000KN. The torque and rolling of the roll can be known from the formula. The force is proportional to the torque of the roller is transmitted by the reducer. When the torque of the roller becomes larger, the torque of the reducer also increases, and the load on the gear increases. In the F3 reducer, due to the large gear clearance, the coincidence of the gear meshing is reduced, resulting in a decrease in the bearing capacity of the gear, and the bearing capacity of the gear is increased when the thin plate and the special steel are rolled, so the vibration is more obvious.
The problem that the gear of the reducer is not well meshed, the tooth surface is worn, and the flank clearance is large can be eliminated by the adjustment of the eccentric sleeve. However, the adjustment of the flank clearance is a small variable. The adjustment of the gear clearance after adjustment is undetectable by the naked eye and requires a quantitative standard. Therefore, advanced monitoring instruments and scientific analysis methods are used for monitoring. For pre-adjustment and post-adjustment data analysis, it is possible to grasp the effects of the eccentric sleeve before and after adjustment and the meshing of the gears after the adjustment test operation.