UGI® S302 Solution Anealed

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Description

UGI® S302 is the grade conventionally used to manufacture stainless steel springs. This grade offers good corrosion resistance and can be used at temperature levels close to 250°C. Springs in UGI® S302 have good fatigue strength and low relaxation compared with carbon steels.

For springs used in corrosive environments, UGI® S302 makes it possible to avoid the surface protection needed on carbon steel springs. To adapt to various cold transformation conditions, Ugitech has developed several versions of UGI® S302, such as UGI® S302-1, UGI® S302-2, and UGI® S302-6 to cover several CWH values (Cold Work Hardening factors). For applications which require high dynamic fatigue performances, a special grade is available on request: UGI® S302 HFS (HFS for High Fatigue Strength).


These Rm values are in conformance with the standard mechanical strength range indicated in Euronorm EN 10270-3 for grade 1.4310 (NS). The Rp 0.2 values are given as an indication.

The Rm/Rp 0.2 ratio on spring wires in UGI® S302 is generally around 0.9.

The range of strength (Rm) values is generally contained

  • within a manufacturing batch, at 100 MPa;
  • within a packaging unit (cable drums, coils, rims) at 60 Mpa.


    The grade's magnetic permeability (µr) is heavily influenced by cold transformation of the material. In the solu-tion-annealed and non-cold-worked state, µr is less than 1.02, but in the cold-worked state with spring-wire properties, it can rise to a maximum of 10.

  • Related Standards

    Equivalent Materials

    This material data has been provided by Ugitech SA.

    All metrics apply to room temperature unless otherwise stated. SI units used unless otherwise stated.
    Equivalent standards are similar to one or more standards provided by the supplier. Some equivalent standards may be stricter whereas others may be outside the bounds of the original standard.

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    Properties

    General

    PropertyTemperatureValue

    Density

    20 °C

    7.9 g/cm³

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    100 °C

    7.9 g/cm³

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    250 °C

    7.9 g/cm³

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    Mechanical

    PropertyTemperatureValueComment

    Elastic modulus

    20 °C

    200 GPa

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    100 °C

    194 GPa

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    200 °C

    183 GPa

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    Elongation

    50 %

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    min.

    Tensile strength

    600 MPa

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    max.

    Thermal

    PropertyTemperatureValueComment

    Coefficient of thermal expansion

    0.0000165 1/K

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    20 to 100°C

    0.0000175 1/K

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    20 to 200°C

    Max service temperature

    250.0 °C

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    Specific heat capacity

    500 J/(kg·K)

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    Thermal conductivity

    20 °C

    15 W/(m·K)

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    100 °C

    16 W/(m·K)

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    250 °C

    18 W/(m·K)

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    Electrical

    PropertyTemperatureValue

    Electrical resistivity

    20 °C

    0.00000078 Ω·m

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    100 °C

    0.00000083 Ω·m

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    250 °C

    0.00000090 Ω·m

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    Magnetic

    PropertyValue

    Relative magnetic permeability

    1.02 [-]

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    Chemical properties

    PropertyValueComment

    Carbon

    0.05 - 0.15 %

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    Chromium

    16.0 - 19.0 %

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    Manganese

    2.0

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    max.

    Molybdenum

    0.8

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    max.

    Nickel

    6.0 - 9.5 %

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    Nitrogen

    0.11

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    max.

    Phosphorus

    0.045

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    max.

    Silicon

    1.0

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    max.

    Sulfur

    0.015

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    max.

    Technological properties

    Property
    Application areas

  • Torsion bars, torsion springs
  • Compression springs
  • Draw spring

  • Cold Forming

    Drawing – Profiling Like all high-carbon grade austenitic steels, UGI® S302 is hardened significantly during cold transformation. However, it has good ductility, with a potential reduction in cross section of up to 90% or more.

    Corrosion properties

    UGI® S302 has good corrosion resistance in moderately corrosive environments. It is widely used in humid or aqueous environments with a limited chloride content. The use of UGI® S302 in marine environments should be avoided, especially in its drawn spring-wire version.

    Heat Treatment

    Springs' mechanical strength can be increased up to 250 Mpa (depending on the diameter) by heat treatment performed on the springs. The Rp0.2/Rm ratio can increase by 5% after such a treatment.


    Static treatment: Static treatment temp.: 350/425°C, Recommended duration 0.5 to 4 hours depending on batch size

    Treatment in continuous oven: Heat treatment temp.: 25°C higher than in, Min. treatment duration: 3 minutes

    Hot forming

    UGI® S302 has good hot forgeability. Forging temperatures are between 900°C and 1100°C. Once forged, the parts must be cooled swiftly, i.e. chilled in water to avoid problems of sensitization of the grade to poten-tial grain-boundary corrosion

    Other

    Available products:


    ProductShapeFinishSizes
    Wire rodRoundPickled5.0 to 32 mm
    Drawn wire RoundMatt0.2 to 1.0 mm
    BarsRoundMatt1.0 to 15 mm
    Rolled wireSectionsBright2 to 70 mm²


    Other: please consult the supplier