UGI® 202N – Grade 1 Annealed

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Description

UGI® 202N is an austenitic stainless steel with a high manganese content, which belongs to the 200 series.

With its high content in manganese and in nitrogen, UGI® 202N is a completely amagnetic steel even at very low temperature and even after a high amount of cold work. So UGI® 202N is designed

  • to cryogenic environment, liquid nitrogen or even liquid hydrogen.
  • For amagnetic spring wires with absolutely no interference with electromagnetics waves. This property makes UGI® 202N interesting for electronic, medical and measurement equipment.

  • The high manganese content gives UGI® 202N an excellent wear resistance. So UGI® 202N is well adapted for stainless steel filters in aggressive water environnement like mine filtration or water well filtration. Resistance to corrosion abrasion of UGI® 202N is better than 304 and 316L.


    Even after a high amount of cold work (>80% of section reduction) magnetic permeability of UGI® 202N remains very low : µr < 1.01.

    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

    7.8 g/cm³

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    Mechanical

    PropertyValueComment

    Elastic modulus

    200 GPa

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    Elongation

    55.0 - 70.0 %

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    min.

    Reduction of area

    65.0 - 80.0 %

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    Tensile strength

    680.0 - 750.0 MPa

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    Thermal

    PropertyTemperatureValueComment

    Coefficient of thermal expansion

    0.0000165 1/K

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    20 to 100°C

    0.000018 1/K

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    20 to 300°C

    Specific heat capacity

    500 J/(kg·K)

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    Thermal conductivity

    20 °C

    12 W/(m·K)

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    100 °C

    14 W/(m·K)

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    200 °C

    16 W/(m·K)

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    300 °C

    18 W/(m·K)

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    Electrical

    PropertyValue

    Electrical resistivity

    7.3e-07 Ω·m

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    Magnetic

    PropertyValueComment

    Relative magnetic permeability

    1.005 [-]

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    max.

    Chemical properties

    PropertyValueComment

    Carbon

    0.05 - 0.1 %

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    Chromium

    17.5 - 18.5 %

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    Manganese

    9.0 - 10.0 %

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    Nickel

    5.0 - 6.0 %

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    Nitrogen

    0.25 - 0.32 %

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    Phosphorus

    0.03

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    max.

    Silicon

    0.30000000000000004 - 0.6000000000000001 %

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    Sulfur

    0.015

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    max.

    Technological properties

    Property
    Application areas

  • Wear resitant part in corrosive environment as for example water filtration, coal mines filters
  • A magnetic spring wire
  • Cryogenic spring
  • Cold Forming

    Drawing like other austenitic steels, drawing UGI® 202N is not difficult. It strain hardens rapidly with reduction of section but its natural ductility allows to go above 80% of section reduction. The ratio between yield strength and tensile strength after cold work hardening is around 0.9.


    Mechanical characteristics reached after a high section reduction are significantly higher than those obtained in annealed condition. These high mechanical characteristics make UGI® 202N most adequate for amagnetic springs. Table below gives indicative mechanical characteristics.


    DiameterTensile
    strength
    Yield
    strength
    (typical values)(typical values)
    (mm)(MPa)(MPa)
    0.50 < d ≤ 0.6520001850
    0.65 < d ≤ 1.2519751825
    1.25 < d ≤ 1.7519501800
    1.75 < d ≤ 2.0019251775
    2.00 < d ≤ 2.5019001750
    2.50 < d ≤ 3.0018501700
    3.00 < d ≤ 3.5017501600
    3.50 < d ≤ 4.2516501500
    4.25 < d ≤ 5.0015501400
    5.00 < d ≤ 6.0015001350


    For diameter below 0.5 mm and above 6.0 mm contact the supplier.

    Corrosion properties

    UGI® 202N provides a good corrosion resistance in mildly aggressive environments. UGI® 202N is recommended for medium with limited concentration in chlorinated components. High surface hardness in the work-hardened condition and very good corrosion-abrasion properties have led to its use in water and coal filtration industries. The figure below shows the corrosion behavior of UGI® 202N after an abrasion-corrosion test. This test quantifies the rate of weight loss of specimens in an sulfuric acid solution with projection of silicon carbide particles. The solution of H₂SO₄ is at pH=3 and SiC particles (diameter 105 µm and concentration 50 g/l) are projected at a speed of 10 m/s. Grade UGI® 202N appears very good, outperforming AISI 304 and even AISI 316L (see figure on the right side of the material page).

    Heat Treatment

    Mechanical characteristics of spring wire can be increased by approximathy 250 MPa (depending on diameters) with a thermal treatment applied to springs.


    Static furnace treatment:

    T° of treatment, 350/450 °C depending on batch size. Recommanded duration, 0.5 to 1 hour

    Continuous furnace treatment:

    T° of treatment, 25 °C more than with static furnace treatment. Minimum duration, 3 minutes

    Hot forming

    UGI® 202N has good forging properties. Forging temperatures should be in the range of 900°C to 1100°C. After forging, cooling should be quick in order to avoid sensitivation by chromium carbide formation and potential corrosion at grain boundaries.

    Other

    Available products:


    ProductFormAspectToleranceDimension
    Drawn wireRoundMat0.5-6.0 mm
    ProfilesBright 2-70 mm²
    Wire rodRoundPickled5-32 mm
    BarsRoundDrawnh93-30 mm
    RoundTurned and polishedh10-h1122-71 mm


    Other formats: contact the supplier