Year1
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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 large loads or coil springs and leaf springs with a wire diameter of less than 3 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 ℃. Large and important coiled springs that bear alternating loads and operate under high stress.
Chemical composition
Carbon: .~
Silicon: .~
Manganese.~
Sulfur:
Phosphorus:
Chromium:
Nickel
Copper:
Mechanical properties
Tensile strength:
Yield strength:
Elongation ():
Reduction of area ():< br/> Hardness: hot rolling, cold drawing + heat treatment,
Heat treatment
Specification and metallographic structure
Heat treatment specification: quenching ℃℃, oil cooling and tempering ℃℃ (for special needs, 3 ℃).
Delivery status: Hot-rolled steel is delivered in a heat-treated or non-heat-treated state, and 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: Using high-temperature heating, oil cooling quenching, and short-time isothermal spheroidization process (heating at high temperature, rapid cooling to high temperature, holding furnace and cooling to high temperature), the ideal spheroidized structure can be obtained . The quenching temperature of steel is normally taken as degrees ~ degrees, oil cooling. The tempering temperature depends on the hardness requirements of the mold parts, such as hardness tempering, hardness tempering, hardness tempering, hardness 3. The tempering performance is optimally matched between ~ degrees. Note that the temper brittleness zone of about 3 degrees must be avoided. Tools and molds that require higher toughness and measuring tools with good dimensional stability are required. The tempering temperature can be increased to about 10 degrees, the hardness is ~, and they have good toughness. , 3, r, r3, ~ 3, annealing furnace cooling - normalizing 3 ~ air cooling - quenching oil hardness value after tempering at different temperatures 33, 3 Commonly used tempering temperature 3 ~, water or air, ~ The following are automotive leaf springs Heat treatment parameters: Quenching, heating and holding time are related to thickness: /, ./, /3, /, / Tempering and holding time are related to thickness: /, /, -/3, -/-, -/-.
Density
The density is ./3. It is a widely used silicon-manganese spring steel with slightly higher strength, elasticity and hardenability. Suitable for the production of flat springs with larger loads or coil springs with a wire diameter of less than 3 in the railway vehicle, automobile and tractor industries
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