Marine crankshaft is an important part of Marine power system, its performance directly affects the efficiency and safety of the ship. As the core part of Marine crankshaft, the material selection and performance requirements of crankshaft forgings are very important. This paper will discuss the material selection and performance requirements of Marine crankshaft forgings in detail.
Material selection
Steel: Steel is the main material for the manufacture of Marine crankshaft forgings, with good strength, toughness and corrosion resistance. Commonly used steels are low alloy steel, medium carbon steel and high carbon steel. Among them, low alloy steel has high strength and toughness, which is suitable for manufacturing large and heavy duty Marine crankshaft; Medium carbon steel and high carbon steel have better wear resistance and fatigue resistance, suitable for the manufacture of high-speed, high-precision Marine crankshaft.
Cast iron: Cast iron has good wear resistance and corrosion resistance, and the cost is relatively low, so in some specific cases, such as small ships with low wear resistance requirements, cast iron is also used as a crankshaft forging material.
Performance requirement
Strength and toughness: Marine crankshaft forgings must have sufficient strength and toughness to withstand the various stresses generated during the operation of the ship. In addition, since crankshaft forgings often need to withstand alternating stresses, the material is required to have good fatigue resistance.
Wear resistance: Crankshaft forgings will have friction with other components during operation, so the material is required to have good wear resistance. For high-speed, high-precision Marine crankshaft, wear resistance is particularly important.
Corrosion resistance: Marine crankshaft forgings have been in harsh environments such as humidity and salt spray for a long time, so the material is required to have good corrosion resistance to prevent rust and corrosion.
Dimensional accuracy and stability: Crankshaft forgings need to be precisely matched during operation, so the material is required to have high dimensional accuracy and stability. In addition, since crankshaft forgings often need to be replaced, the material is required to be easy to process and manufacture.
In summary, the material selection and performance requirements of Marine crankshaft forgings are crucial. In the selection of materials, should be based on the specific needs of the ship and the use of the environment for comprehensive consideration. At the same time, in the manufacturing process, the composition of the material, processing technology and heat treatment should be strictly controlled to ensure that the crankshaft forgings have good performance and quality.
