UGI® PHYNOX® Drawn

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Description

UGI® PHYNOX® is an austenitic cobalt basis alloy with high yield strength which offer multiple properties:

  • Age hardening by heat treatment after cold forming without any distortion,
  • Excellent corrosion resistance in several medias, stress corrosion cracking and absence of hydrogen embrittle-ment,
  • Excellent fatigue resistance without any relaxation,
  • Non magnetic in all temper : annealed, cold drawn or aged,
  • Can be used in a wide range of temperature :from liquid helium to 500°C,
  • Perfectly biocompatible, it has been used for more than twenty five years in surgical implants


    Cleanliness conforms to standards AFNOR NF S 90 - 403 and ISO 5832/7: Sulfides: 1, Aluminates: 3, Silicates: 1, Globular Oxides: 3

  • 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

    PropertyValue

    Density

    8.3 g/cm³

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    Mechanical

    PropertyValueComment

    Elastic modulus

    182 GPa

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    Shear modulus

    75 GPa

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    Tensile strength

    1550.0 - 2250.0 MPa

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    depending on the cold drawing degree

    Thermal

    PropertyValueComment

    Coefficient of thermal expansion

    0.0000125 1/K

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    20 to 100°C

    Melting point

    1450.0 - 1460.0 °C

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    Specific heat capacity

    430 J/(kg·K)

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    Electrical

    PropertyValue

    Electrical resistivity

    9.5e-07 Ω·m

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    Magnetic

    PropertyValueComment

    Relative magnetic permeability

    1.0002 [-]

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    500 / 1000 Oe

    Chemical properties

    PropertyValueComment

    Carbon

    0.15

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    max.

    Chromium

    19.0 - 21.0 %

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    Cobalt

    39.0 - 41.0 %

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    Manganese

    1.5 - 2.5 %

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    Molybdenum

    6.5 - 7.5 %

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    Nickel

    15.0 - 18.0 %

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    Other

    1.0

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    max.

    Phosphorus

    0.015

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    max.

    Silicon

    1.2

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    max.

    Sulfur

    0.015

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    max.

    Technological properties

    Property
    Corrosion properties

    The UGI® PHYNOX® is not attacked by the organic acids. It resists the salt spray perfectly and its behavior with the mineral acids is definitely higher than that of the best stainless steels In addition, its perfect passivity in con-tact with human tissues, explains why UGI PHYNOX has been used for more than twenty five years in surgical implants. Examples of corrosion resistance:

  • A: <0.05 mm/y
  • B: 0.05 to 0.25 mm/y
  • C: 0.25 to 0.50 mm/y
  • D: 0.50 to 1.25 mm/y
  • E: >1.25 mm/y


    MediaConcentration°CIndice
    MediaConcentration°CIndice
    Acetic acid
    Chlorhydric acid
    Chlorhydric acid
    Sulfuric acid
    Calcium chloride
    Ferric chloride
    50 %
    Concentrated
    50 %
    50 %
    10 %
    10 %
    100
    110
    110
    150
    100
    25
    A
    E
    E
    E
    A
    A
    Citric acid
    Lactic acid
    Nitric acid
    Nitric acid
    Phosphoric acid
    Sodium chloride
    10 %
    10 %
    50 %
    10 %
    50 %
    10 %
    100
    100
    100
    100
    120
    100
    A
    A
    B
    B
    C
    A
    Stress corrosion as per NACE STANDARD TM.01.07
    aqueous Solution NaCl 50 g/l + CH₃C00H 5 g/l, saturated in H₂S under 1 atmosphere (pH = 3).
    Temperature : 24-26.8°C
    Tensile strength: 90% of yield strength
    Test piece as per TM.01.07 with:
    UTS >= 1600 N/mm2
    YS 0.2% >= 1130 N/mm2
    Minimum guaranteed time :720 hours without failure
    Result : no failure after 720 hours.
    Complementary test:
    Increase in the temperature with 150°C
    Increase in the pressure
    Result: no rupture, nor cracking after 1370 hours.
    Test stopped

  • General machinability

    The high mechanical properties in the as drawn condition and the ability of cold hardening during machining, need to take particular precautions for machining:

  • Robust and rigid machines
  • moderate Cutting speeds
  • Carbides tools, or brazed pastilles, with large rake angles

    Cutting fluid with high performances of cooling and lubrication

  • Heat Treatment

    520°C / 3 hours – Air cooled:

    The heat treatment is performed after cold forming or machining without any deformation of the treated part.

    This treatment must be realized preferably in a vacuum furnace(10-5 Torr) or under protective atmos-phere (Argon)

    Processing in open air doesn’t affect the mechanical properties of the material, but alters its aspect.

    The influence of the treatment on annealed material is negligible but become very important on cold drawn products.


    Cleaning of parts

    3 methods for removing the lubricating film and pickling after heat treatment

  • 1. Phosphoric Acid 6% at 70°C

    Immersion 15 to 20 minutes

    Rinsing hot or cold water & drying

  • 2. Acid nitric 30% with 40°C

    Immersion 2 to 3 minutes

    Rinsing hot or cold water & drying

  • 3. Acid hydrochloric 40% + Acid nitric 5% at room temp

    Nitric passivation (40%) at room temp

    Rinsing hot or cold water

  • Other

    Available in wire (coil form) and in straightened ground bars (minimum diameter: 1 mm)

    Annealed condition: ø 0,60 mm up to 18 mm

    Hard condition : ø 0,012 mm up to 15 mm


    Other options: contact the supplier

    Surface Treatment

    Pickling and polishing: Apart from mechanical descaling, the oxyde film formed during heating in air can be removed by immersing the parts in a boiling aqueous solution containing 5% hydrofluoric acid and 12% nitric acid.

    UGI® PHYNOX® can be electro chemically polished with products used for dental alloys cobalt basis

    Welding

    UGI® PHYNOX® can be readily welded: resistance spot welding, electron beam welding, laser, argon arc welding. It can also be brazed. However, since age hardening can only obtained in cold worked area, this must be taken into account by placing the weld or braze joint in positions where it is not heavily loaded or by using a discontinu-ous joint