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Alloy spring steel is a widely used silicon-manganese spring steel with slightly higher strength, elasticity and hardenability. Alloy spring steel is suitable for the production of flat springs with larger loads or coil springs and leaf springs with wire diameters below 100°C in the railway vehicle, automobile and tractor industries. It is also suitable for the production of heat-resistant springs in non-corrosive media with working temperatures below ℃ and withstands Large and important coiled springs with alternating loads and working under high stress.
Chemical composition
Carbon: .~
Silicon: .~
Manganese: .~
Sulfur:
Phosphorus:
Chromium
Nickel:
Copper:
Mechanical properties
Tensile strength:
Yield strength:
Elongation (%):
Reduction of area (% ):
Hardness: hot rolling, cold drawing + heat treatment
Heat treatment
Specification and metallographic structure
Heat treatment specification: quenching ℃ ℃ oil cooling and tempering ℃ ℃ (℃ for special needs) .
Delivery status: Hot-rolled steel is delivered in a heat-treated or non-heat-treated state. Cold-drawn steel is delivered in a heat-treated state.
Heat treatment methods
Heat treatment methods include isothermal tempering and graded quenching, sub-temperature quenching and high temperature tempering, and deformation heat treatment process methods. Using this method can effectively improve the strength and service life of spring steel. It belongs to spring steel and is suitable for making automobile leaf springs.
Heat treatment process
Spheroidizing annealing: The ideal spheroidized structure can be obtained by using high-temperature heating, oil-cooling quenching, and short-time isothermal spheroidization process (high-temperature heating, rapid cooling, high-temperature holding furnace, and low-temperature cooling out of the furnace). The quenching temperature of steel is normally between degrees and oil cooling. The tempering temperature depends on the hardness requirements of the mold parts, such as tempering hardness, tempering hardness, and tempering hardness r. The tempering performance is best matched between ~ degrees. Note that the temper brittleness zone around degrees must be avoided. Tools and molds that require higher toughness, and measuring tools that require good dimensional stability, the tempering temperature can be increased to about 10°C with a hardness of ~r to have better toughness. -r =r =-~ Annealing - Furnace cooling - Normalizing ~ - Air cooling - Quenching - Oil - Hardness value r after tempering at different temperatures -------- Commonly used tempering temperatures ~ water or air r ~ below It is the parameter of heat treatment of automobile leaf spring. The quenching, heating and holding time is related to the thickness: //.//./ The tempering and holding time is related to the thickness: //----.
Density
The density is ./. It is a widely used silicon-manganese spring steel with slightly higher strength, elasticity and hardenability. Suitable for making flat springs with larger loads or coil springs with wire diameters below
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