Plum blossom elastic couplings are mainly made of cast special steel.There are many kinds of alloy cast steels refined to meet special needs, usually containing one or more high amount of alloying elements to obtain certain special properties.For example, high manganese steel containing manganese 11-14 can resist impact and wear, and is mostly used for wear-resistant parts of mining machinery and construction machinery; various stainless steels with chromium or chromium-nickel as the main alloy elements are used in corrosion or above 650℃ Parts that work under high temperature conditions, such as chemical valve bodies, pumps, containers, or steam turbine shells in large-capacity power stations.

　　The material of plum coupling is generally divided into No. 35 cast steel and No. 45 cast steel. The main difference lies in the difference in density and hardness, commonly known as the difference in steel grade.Cast steel with carbon as the main alloying element and a small amount of other elements.Casting low-carbon steels with a carbon content of less than 0.2, cast medium-carbon steels with a carbon content of 0.2-0.5, and cast high-carbon steels with a carbon content of more than 0.5.As the carbon content increases, the strength and hardness of cast carbon steel increase.Cast carbon steel has high strength, plasticity and toughness, and low cost. It is used in heavy machinery to manufacture parts that withstand heavy loads, such as rolling mill stands, hydraulic press bases, etc.; used in railway vehicles to manufacture heavy-duty parts Parts that are subject to impact, such as bolsters, side frames, wheels and couplers, etc.