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55Si2Mn

--Characteristics: high strength, good elastic limit, high yield ratio, good toughness after heat treatment, poor weldability, low cold deformation plasticity, good machinability, higher hardenability than 65, 65Mn steel, critical hardenable diameter: It is about 25~57mm in oil; about 44~88mm in water; this steel is suitable for oil quenching and water quenching, there is a tendency to form cracks, no tendency to temper brittleness, and it has the stability of tempering resistance and relaxation resistance; The inclusions are high, rolling is difficult, the surface is prone to defects, and the decarburization tendency is large; it is suitable for use in the state of quenching and tempering at medium temperature. Uses: It is suitable for the manufacture of flat springs under medium and constant loads such as railway vehicles, automobiles, and tractors, helical springs with a diameter of <25mm, conflict-relieving springs, and important springs that work under high stress, such as cylinder safety valves.

55Si2MnB
--Characteristics: The performance is similar to 55Si2Mn steel, but the hardenability is higher. The critical hardening diameter in oil is about 90~180mm, and the fatigue strength is also significantly improved. Uses: Suitable for manufacturing leaf springs with medium and small cross-sections, such as front and rear auxiliary leaf springs on automobiles.

55SiMnVB
--Characteristics: Strength, toughness, plasticity and hardenability are all higher than 60Si2MnA steel, critical hardening diameter in oil is about 50~107mm; thermal processing performance is good, surface decarburization tendency is small during heat treatment, tempering stability it is good. Uses: It is suitable for manufacturing leaf springs and helical springs with medium-sized cross-sections, and can replace 60SiMnA steel.

60SiMn, 60Si2MnA
--Compared with 55Si2Mn steel, the strength and elastic limit are slightly higher (60Si2MnA steel is better), and the hardenability is also better. The critical hardenability in oil is about 37~73mm, and other properties are the same; mainly used The state is quenched and tempered at medium temperature. Uses: This steel is widely used, suitable for the manufacture of railway vehicles, automobiles, tractors and other industries to manufacture flat springs or helical springs with a diameter of ≤ 30mm that withstand large loads, such as leaf springs for stress and vibration in the lower parts of automobiles and train carriages, Springs on safety valves and check valves and heat-resistant springs in non-corrosive media with working temperature < 250°C; large and important coiled springs for alternating loads and high stresses and mechanical parts subject to severe wear.

60Si2CrA
--Characteristics: Compared with 60Si2MnA steel, the plasticity is similar, but the tensile strength and yield point are higher; the overheating sensitivity and decarburization tendency of heat treatment are small, the hardenability is high, and the critical hardening diameter in oil is about 37 ~114mm, but it has a tendency to temper brittleness; it is generally used under quenching and tempering at medium temperature. Uses: It is suitable for manufacturing springs that are subjected to high stress and working temperature <300C, such as governor springs, steam turbine gas seal springs, high-pressure water pump disc springs, and condenser support springs.

60Si2CRVA
--Characteristics and uses are similar to 60Si2CrA steel, but the elastic limit and high temperature mechanical properties are better. Uses: It is suitable for manufacturing heat-resistant springs used at working temperatures below 300~350°C and important springs that withstand impact stress and high loads.

55CeMnA, 60CrMnA
--Characteristics: high strength, plasticity, poor weldability, fair machinability, better hardenability than silicon-manganese or silicon-chromium spring steel, high criticality in oil, lower decarburization tendency than silicon-manganese steel, tempering The brittleness tends to be large, so the appropriate tempering temperature and cooling rate should be selected; it is generally used in the state of quenching and tempering at medium temperature. Uses: It is suitable for manufacturing leaf springs and coil springs with large diameter (up to 50mm) working under relatively large load and stress conditions in industries such as automobiles and tractors.

60CrMnMoA
--Characteristics: After heat treatment, it has the same comprehensive mechanical properties as 60CrMnA steel. In addition, it should not have better hardenability. The critical hardenability diameter in oil is about 100mm, and it has no tendency to temper brittleness. Uses: Suitable for the manufacture of helical springs with heavy load stress and large diameter (up to 100mm) used in industries such as vehicles and tractors.

50CrVA
--Characteristics: high toughness, strength, elastic limit, fatigue strength, low elastic modulus, high yield ratio and hardenability, round bar sample with a diameter of 30~45mm, quenchable in oil Penetration; less overheating and decarburization tendency during heat treatment, and good impact toughness; but poor weldability, low cold deformation plasticity, and sensitivity to white spots during hot processing; mainly used after quenching and tempering at medium temperature. Application: It is suitable for the manufacture of high-load important springs with large cross-sections, valve springs, piston bombs, etc. whose working temperature is lower than 300°C; it can also be used for important conditioning and tempering of large cross-sections that generate income in non-corrosive media and whose working temperature is less than 400°C Component.

60W4MnBA
--Characteristics: The performance is basically similar to 60CrMnA steel, but it has better hardenability, and the critical hardening diameter in oil is about 100~150mm. Uses: Suitable for manufacturing large springs, such as laminated springs on bulldozers, large coil springs and torsion springs on ships.

30W4Cr2VA
--Characteristics: A high-strength heat-resistant spring steel with good mechanical properties at room temperature and high temperature, especially high hardenability; excellent tempering stability, good hot workability, suitable for use in quenched and tempered state. Application: It is suitable for manufacturing thermal springs under the condition of temperature ≤500ºC, such as main safety springs of boilers, gas seal springs on steam turbines, etc.

SUP9A
Features and scope of application: higher strength, plasticity and toughness, better hardenability, lower overheating sensitivity than manganese steel, higher than silicon-manganese steel, lower decarburization tendency than silicon-manganese steel, and greater temper brittleness. Used in the vehicle and tractor industry to make leaf springs with heavier loads and greater stress and coil springs with larger diameters.