The anchor chain can be divided into a chain anchor chain and a non-stop anchor chain according to the structure of the chain ring. The link chain of the chain has a crosspiece. When the size and material are the same, the strength of the chain is larger than that of the unchained chain, the deformation is small, and it is not easy to twist when stacked, which is widely used in modern large and medium-sized ships. The chain of the chainless chain has no crosspiece and is only used for small vessels. The specification stipulates that when the diameter of the anchor chain equipped as required does not exceed 17 mm, it may be replaced by a non-stop anchor chain with the same test load or a wire rope or fiber rope with the same breaking load.
The anchor chain is divided according to its manufacturing method, such as cast steel anchor chain, electric welding anchor chain and forged anchor chain. The cast steel anchor chain has high strength, good rigidity, small deformation, wear resistance, the cross-bar is not easy to loose, has a long service life, and is suitable for mass production. The disadvantage is that the process is complicated, the cost is high, and the impact resistance is poor. The electric welding anchor chain is made by bending and welding with the round steel material that meets the requirements, and has the advantages of advanced production technology, simple, low cost and good quality. The forged anchor chain has good impact toughness, but the manufacturing process is complicated, the cost is high, and the quality is unstable.
At present, the electric welding anchor chain has been the most widely used on merchant ships. Almost all of the anchor chains are made by flash welding, and less cast anchor chains are used. Except for the chain attachments, which are mostly forged parts, the forged anchor chain has been basically eliminated.
It is used to produce anchor chain steel grade with chain anchor chain. The welding anchor chain is divided into three grades of M1, M2 and M3. The cast steel anchor chain is divided into two grades of M2 and M3. Before the corresponding code, add A (such as AM2) to indicate that there is a chain, and B to indicate that there is no chain (there are two levels of BM1 and BM2). The higher the steel grade, the greater the tensile strength. AM1 grade anchor chain steel is killed steel, AM2, AM3 grade anchor chain steel is fully sedative fine grain treated steel. For the same ship, if the steel with high strength is selected, the size of the chain ring can be appropriately reduced.
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