1.65, 70, 85: can obtain high strength, hardness, yield ratio, but low hardenability, poor heat resistance, low ability to withstand dynamic load and fatigue load, widely used, but mostly used for low working temperature Small springs or smaller springs that are less important. Such as cars, tractors, railway vehicles and springs for general machinery.
The composition of 65Mn is simple, the hardenability, comprehensive mechanical properties, decarburization and other process properties are better than carbon steel, but sensitive to overheating, temper brittleness, quenching and easy cracking, low price, large dosage. Manufacture of various small-section flat springs, round springs, springs, etc., as well as valve springs, spring rings, dampers and clutch reeds, brake springs, etc.
2.55Si2Mn, 60Si2Mn, 60Si2MnA The silicon content (Wsi) is high (upper limit is 2.00%).
High strength and good elasticity. Good anti-tempering stability. Easy to decarbonize and graphitize. Hardenability is not high.
The main spring steels are used in a wide range of applications. Manufacturing a variety of springs, such as cars, locomotives, tractor leaf springs, coil springs, cylinder safety valve springs and some important springs working under high stress, severely worn springs.
55Si2MnB has boron-containing properties, and its hardenability significantly improves the front and rear suspension springs and secondary springs of light and medium-sized cars.
55Si2MnB China's self-developed steel grade, hardenability, comprehensive mechanical properties, fatigue performance are better than 60Si2Mn steel. It is mainly used to manufacture medium and small-sized automobile leaf springs. It has good effect and can be used for other medium-section leaf springs and coil springs. .
3.60Si2CrA 60Si2CrVA
High strength spring steel. High hardenability and good heat treatment process performance. Due to the high strength, it is necessary to deal with important large springs that eliminate the internal stress and make large loads after rolling the spring. 60Si2CrA can make steam turbine seal spring, adjustment spring, condenser support spring, high pressure water pump disc spring and so on. 60Si2CrVA steel also produces extremely important springs, such as conventional weapon pick-up hook springs, crusher springs.
4.55CrMnA
60CrMnA has the outstanding advantages of good hardenability, thermal processing properties, comprehensive mechanical properties, and anti-decarburization performance. It also has various important springs with large cross-sections, such as large leaf springs and spiral springs for automobiles and locomotives.
5.60CrMnMoA
It has the highest hardenability in various existing spring steels. Mechanical properties, anti-tempering stability, etc. are also very large springs used in large civil engineering, heavy vehicles, machinery, etc. The thickness of the steel plate can reach more than 35mm, and the diameter of the round steel can exceed 60mm.
6.50CrVA
A small amount of vanadium increases the elasticity, strength, yield ratio and bomb reduction resistance, refines the grains and reduces the tendency to decarburization. The carbon content is small, and the plasticity and toughness are better than other spring steels. Highly hardenable, fatigue performance, various important spiral springs, especially suitable for springs with high working stress amplitude and strict fatigue performance, such as valve springs, injector springs, cylinder expansion rings, safety valve springs, etc.
7. 60CrMnBA
The hardenability is higher than that of 60CrMnA, and other kinds of leaf springs, coil springs, torsion springs, etc., which are similar in size and size.
8. 30W4Cr2VA
High-strength heat-resistant spring steel. Hardenability is very good. High temperature anti-relaxation and hot workability are also good heat-resistant springs with working temperature below 500~C, such as steam turbine main steam valve spring, steam seal spring piece, boiler safety valve spring, 400t boiler disc valve spring.
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