Anchor chain can be divided into two types according to the structure of its chain links: stud chain and studless chain. The chain link of the geared anchor chain (as shown in Figure 1) is equipped with crossbars. When the size and material are the same, the strength of the geared chain is greater than that of the chain without gears, the deformation is smaller, and it is not easy to twist when stacked. It is a modern large and medium-sized chain. Widely used on ships. The chain link of the unbarred anchor chain has no rungs and is only used on small ships. The specification stipulates that when the diameter of the anchor chain equipped as required does not exceed 17mm, it can be replaced by an unblocked anchor chain with an equal test load, or a steel wire rope or fiber rope with an equal breaking load.
Anchor chains are divided according to their manufacturing methods, including cast steel anchor chains, welded anchor chains and forged anchor chains. Cast steel anchor chain has high strength, good rigidity, small deformation, wear resistance, horizontal bars are not easy to loosen, long service life, and is suitable for mass production. Its disadvantages are complex process, high cost and poor impact resistance. The electric welded anchor chain is made of round steel materials that meet the requirements, bent and welded. It has the advantages of advanced and simple production technology, low cost, and good quality. Forged anchor chains have good impact resistance and toughness, but the manufacturing process is complex, the cost is high, and the quality is unstable.
At present, welded anchor chains have been most widely used on commercial ships. Anchor chains are almost always manufactured by flash welding, and cast anchor chains are rarely used. Except for the anchor chain accessories, which are mostly forged parts, forged anchor chains have been basically eliminated.
Anchor chain steel grades used to produce geared anchor chains. Electric welded anchor chains are divided into three grades: M1, M2 and M3. Cast steel anchor chains are divided into two grades: M2 and M3. Adding A (such as AM2) before the corresponding code indicates a chain with gears, and B indicates a chain without gears (there are two levels, BM1 and BM2). The higher the grade of steel, the greater the tensile strength. AM1 grade anchor chain steel is killed steel, AM2 and AM3 grade anchor chain steel are fully killed and fine-grained steel. For the same ship, if stronger steel is used, the chain link size can be appropriately reduced.
Post time: Jul-20-2024