UGI 4435 IRH Solution Annealed

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Description

UGI 4435 IRH is an austenitic stainless steel (not magnetic) with a high Mo content and produced by a special method to optimize its cleanliness. Its composition provides it with very good corrosion resistance and is perfectly suited for prolonged contact with the skin. This grade also offers improved polishability, thanks to its inclusion population and its microstructure, adapted and controlled.


The chemical composition of UGI 4435 IRH is optimised to ensure primary ferritic solidification limiting hot workability problems and risks of crack formation at high temperature during welding, while providing it with a structure almost 100% austenitic at room temperature.

Grain size as per ASTM E-112: ≥ 5 (≥ 4 if need of guarantee of residual ferrite < 0.5%).


Cleanliness as per DIN 50602, "M" method:

  • Sulphides (SS) + Oxides in Alignment (OA) + Silicates (OS): less than 4%
  • Dispersed or globular oxides (OG): less than 1%

  • 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

    23.0 °C

    8 g/cm³

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    Mechanical

    PropertyTemperatureValueComment

    Charpy impact energy, V-notch

    23.0 °C

    100 J

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    min.

    Elastic modulus

    20.0 °C

    200 GPa

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    100.0 °C

    194 GPa

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    200.0 °C

    186 GPa

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    300.0 °C

    180 GPa

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    400.0 °C

    172 GPa

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    500.0 °C

    165 GPa

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    Elongation

    23.0 °C

    40 %

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    min.

    Hardness, Brinell

    23.0 °C

    144 - 202 [-]

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    Hardness, Vickers

    23.0 °C

    160 - 205 [-]

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    Tensile strength

    23.0 °C

    500 - 700 MPa

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    Yield strength Rp0.2

    23.0 °C

    200 MPa

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    min.

    100.0 °C

    165 MPa

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    min.

    118.0 °C

    300 MPa

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    min.

    200.0 °C

    137 MPa

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    min.

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    Thermal

    PropertyTemperatureValueComment

    Coefficient of thermal expansion

    100.0 °C

    1.6E-5 1/K

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    for 20 to mentioned temperature

    200.0 °C

    1.65E-5 1/K

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    for 20 to mentioned temperature

    300.0 °C

    1.7E-5 1/K

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    for 20 to mentioned temperature

    400.0 °C

    1.75E-5 1/K

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    for 20 to mentioned temperature

    500.0 °C

    1.8E-5 1/K

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    for 20 to mentioned temperature

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    Specific heat capacity

    23.0 °C

    500 J/(kg·K)

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    Thermal conductivity

    23.0 °C

    15 W/(m·K)

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    Electrical

    PropertyTemperatureValue

    Electrical resistivity

    23.0 °C

    7.5E-10 Ω·m

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    Chemical properties

    PropertyValueComment

    Carbon

    0.03 %

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    max.

    Chromium

    17 - 19 %

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    Iron

    Balance

    Manganese

    2 %

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    max.

    Molybdenum

    2.5 - 3 %

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    Nickel

    12.5 - 14 %

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    Nitrogen

    0.11 %

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    max.

    Phosphorus

    0.05 %

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    max.

    Silicon

    1 %

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    max.

    Sulfur

    0.03 %

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    max.

    Technological properties

    Property
    Application areas

    Watchmaking, Pharmaceuticals

    Cold Forming

    Wire drawing – Shaping : The 4435 IRH grade has good cold forming capability. Its high cold work hardening compared with non-austenitic grades induces the use of appropriate tools. Cold working can make the grade very slightly magnetisable through the formation of strain-induced martensite.


    Bending – Forming: Good bending and forming capability.

    Corrosion properties

    Uniform corrosion: Its higher molybdenum content provides it, in reducing mineral acids, with better uniform corrosion resistance than the conventional austenitics 1.4307 (304L) and 1.4404 (316L).


    Pitting corrosion and crevice corrosion: It has very good corrosion resistance behaviour for a great majority of natural exposures (rural, urban and industrial). This grade, with high molybdenum content, offers among the best pitting and crevice corrosion resistance of the austenitic family. Its very good corrosion resistance behaviour means it easily complies with the EN1811 standard relating to nickel release.


    Intergranular corrosion: Due to its low carbon content, this grade resists intergranular corrosion after welding and after sensitizing heat treatment as specified in the standards (ASTM A262-75 Practice E; DIN EN ISO 3651-2).

    General machinability

    Thanks to control of its inclusion population and microstructure, UGI 4435 IRH can retain a satisfactory machinability level while ensuring optimal polishability for the grade.

    Heat Treatment

    Solution treatment (solution annealing): The solution annealing treatment can ensure optimal corrosion resistance properties. It should be performed at a temperature ranging between 1050°C and 1120°C and followed by rapid cooling in water or air (for products of small cross section).

    Hot forming

    Forging: The grade can be hot-worked at between 900°C and 1250°C and then cooled rapidly, in water or air. Hot forming is generally followed by a solution annealing or quenching (see recommendations in the corresponding section).

    Other

    Available products:


    ProductShapeFinishToleranceDimensions (mm)
    BarRoundRolled & descaledk13Ø 13 to 130
    Turned10 + 11Ø 22 to 130
    Ground7 + 8 + 9 + optionsØ 2 to 130
    Drawn9Ø 2 to 30
    Black bar+/- 1% of øØ 23 to 135
    HexagonalDrawn10 + 11Hex. 3 to 55
    Wire RodRoundRolledØ 5 to 32
    Rolled & pickledØ 5 to 32
    HexagonalRolled & pickledHex. 12.4 to 28
    BilletSquareAs-rolled or as-heat-treated50 to 120


    Other possible options. Please consult the supplier.

    Surface Treatment

    TypeMediumComments
    Pickling6 – 25% HNO3 + 0.5 – 8% HFIn the annealed state only and at high temperature
    Passivation20 – 50% HNO3At high temperature

    Welding

    UGI 4435 IRH can be resistance welded (spot or seam welding) by any type of arc process (MIG, TIG, submerged arc, covered electrode), by laser, electron beam, etc.


    UGI 4435 IRH is balanced to be on the boundary of primary ferritic solidification in order to ensure a minimum of residual ferrite in the welding region while limiting its risk of crack formation at high temperature during arc welding. In laser welding, the risk of crack formation at high temperature is greater than with arc welding, and the welding parameters should be adjusted as well as possible on a case by case basis to limit this risk.

    Where a filler wire is used to weld UGI 4435 IRH to itself, preferably choose an ER316L(Si) – 1.4430 wire.


    The protection gases in arc welding should preferably be:
  • In MIG: Ar (+ possibly He) + 2% to 3% O₂ or CO₂
  • In TIG: Ar (+ possibly He)


    No preheating or post-welding heat treatment is required. Interpass temperatures not exceeding 150°C should be complied with.