What are the characteristics of metal shrapnel spring steel

Hardware shrapnel The characteristics of spring steel are those of 　　60CrMnBA: 　　have higher hardenability than 60CrMnA, and other functions are similar to larger-scale leaf springs, spiral springs, and change springs.　　30W4Cr2VA: 　　 high-strength heat-resistant spring steel. The hardenability is excellent. High temperature anti-looseness and thermal processing functions are also excellent for heat-resistant springs with operating temperatures below 500~C, such as steam turbine main steam valve springs, steam seal springs, boiler safety valve springs, 400t boiler disc valve springs, etc. .　　50CrVA: 　　 a small amount of vanadium improves elasticity, strength, yield ratio and elastic resistance, refines grains, and reduces the tendency of decarburization. The carbon content is smaller, and the plasticity and durability are better than other spring steels. High hardenability and fatigue function are all major spiral springs. They are especially suitable for springs with high operating stress amplitude and strict requirements for fatigue functions, such as valve springs, injector springs, cylinder expansion rings, and safety valve springs. 65, 70, 85: 　　 can get very high strength, hardness, yield ratio, but the hardenability is small, the heat resistance is not good, and the ability to withstand dynamic load and fatigue load is low. It is widely used, but it is mostly used for operating temperature. Tall small springs or larger springs that are less important. Such as the tension springs used in cars, tractors, railway vehicles and general machinery.　　 65Mn has a simple composition, better hardenability, inductive mechanical function, decarburization and other technical functions than carbon steel, but it is sensitive to overheating, has temper brittleness, and is easy to crack after quenching. The price is low and the amount is large. Production of various small cross-section flat springs, round springs, clockwork, etc., as well as valve springs, spring rings, shock absorbers and clutch springs, brake springs, etc.　　55Si2Mn, 60Si2Mn, 60Si2MnA have high silicon content (Wsi) (up to 2.00%), 　　 high strength and good elasticity. Good stability against tempering. Easy to decarburize and graphitize. Hardenability is not high.　　The main type of spring steel, which has a wide range of uses. Production of various tension springs, such as leaf springs, spiral tension springs for cars, locomotives, tractors, cylinder safety valve springs, and some primary tension springs that operate under high stress, and tension springs with severe wear.　　55Si2MnB contains boron, its hardenability is significantly improved. The front and rear suspension springs and auxiliary springs of light and medium-sized cars. 55Si2MnB China's self-developed steel grade has better hardenability, generalized mechanical functions, and fatigue functions than 60Si2Mn steel. It is mainly used to produce leaf springs for small and medium-sized cars. It has good use and can also be used to make other medium-sized leaf springs and spirals. Tension spring.　　60Si2CrA 60Si2CrVA: 　　 high-strength spring steel. High hardenability, good heat treatment technology function. Due to the high strength, the tension spring should be processed in time to eliminate the internal stress after rolling the tension spring to make the primary large tension spring with large load. 60Si2CrA can be used to make steam turbine seal springs, conditioning springs, condenser support springs, high-pressure water pump disc springs, etc. 60Si2CrVA steel also makes the most important springs, such as springs for conventional weapons, and springs for crushers. 55CrMnA: 　　60CrMnA The outstanding advantage is good hardenability, thermal processing function of hardware shrapnel, induction mechanical function, anti-decarburization function, and various primary tension springs with large cross-sections, such as large leaf springs and spiral tension springs for cars and locomotives Wait.