UGI® 209 Solution Annealed

Alternative and trade names
Nitronic 50
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Description

An austenitic stainless steel with high corrosion resistance and superior mechanical performances. UGI® 209 is an austenitic stainless steel with a high yield strength designed for use in very severe corrosive environments. This grade also features excellent cryogenic properties and very high, stable magnetism.


Entirely austenitic solution annealed structure with no intercrystalline precipitation. For cold hardened products, an austenitic cold hardened structure with twin crystals.


The composition and excellent stability of the austenitic structure make UGI®209 a very amagnetic grade for different cold hardening levels and temperatures. Some indicative values are shown below.


Relative permeability
(under 16 kA/m)
Cold hardening
(% of reduction)
03060
1.0041.0031.004

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

7.88 g/cm³

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Mechanical

PropertyTemperatureValue

Charpy impact energy, V-notch

-195 °C

75 J

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-40 °C

255 J

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20 °C

270 J

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Elastic modulus

20 °C

200 GPa

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200 °C

180 GPa

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Elongation

-195 °C

41 %

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-70 °C

49 %

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20 °C

45 %

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200 °C

38 %

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800 °C

55 %

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Hardness, Rockwell B

95.0 [-]

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Tensile strength

-195 °C

1550 MPa

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-70 °C

1000 MPa

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20 °C

830 MPa

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200 °C

650 MPa

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800 °C

350 MPa

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Thermal

PropertyTemperatureValueComment

Coefficient of thermal expansion

0.0000172 1/K

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20 to 200°C

Specific heat capacity

500 J/(kg·K)

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Thermal conductivity

20 °C

15 W/(m·K)

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200 °C

16 W/(m·K)

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Electrical

PropertyValue

Electrical resistivity

8.2e-07 Ω·m

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Magnetic

PropertyTemperatureValueComment

Relative magnetic permeability

-260 °C

1.008 [-]

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under 16 kA/m

-120 °C

1.0025 [-]

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under 16 kA/m

20 °C

1.004 [-]

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under 16 kA/m

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Chemical properties

PropertyValueComment

Carbon

0.06

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max.

Chromium

20.5 - 23.5 %

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Manganese

4.0 - 6.0 %

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Molybdenum

2.0 - 3.0 %

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Nickel

11.5 - 13.5 %

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Niobium

0.1 - 0.30000000000000004 %

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Nitrogen

0.2 - 0.4 %

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Phosphorus

0.04

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max.

Silicon

0.75

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max.

Sulfur

0.03

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max.

Vanadium

0.1 - 0.30000000000000004 %

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Technological properties

Property
Application areas

  • Sea water: pumps, propeller shafts, cables, guy lines
  • Chemical industry: urea synthesis, pumps, valves, bolts, exchanger tubes
  • Nuclear industry: nuclear fuel recycling
  • Oil industry: off-shore drilling, filters, perforated casings, petrochemicals
  • Pulp and Paper industry

  • In accordance with NACE MR0175, this grade can be used up to a hardness of 35HRc for applications in the oil industry in an H₂S environment.

    Corrosion properties

    Generalized corrosion: The tests carried out in a 2M sulfur environment indicate an hourly mass loss. For this type of corrosion, the UGI® 209's resistance is very good: slightly lower than that of UGI®904L but significantly higher than that of UGI® 316L.


    Mass loss (g/m²/h)
    At 82°C (+/-4°C)
    UGI® 316L30 (+/-5)
    UGI® 2096 (+/-4)
    UGI® 904L2 (+/-1)


    Localized corrosion

    Intercrystalline corrosion: UGI® 209 resists the standardized ASTM A262 test, Method E (CuSO4 + H₂SO₄ + Cu environment), and no cracking is observed after 24 hours of testing and after bending on a mandrel to 180°.


    Pitting corrosion: The tests carried out in accordance with standard ASTM G48, Method E, make it possible to determine the maximum usage temperature without corrosion. The UGI® 209's resistance is much higher than that of the UGI® 316 L grade.

    P.R.E.N index, guaranteed pitting corrosion resistance : > 31


    Maximum temperature according to ASTM G48 E
    For a mass loss of 5g/m2
    (24h)
    UGI® 316L10 (+/-5)
    UGI® 20940 (+/-5)
    UGI® 904L35 (+/-5)


    The tests carried out in accordance with standard ASTM G48, Method A, make it possible to compare the Mass loss of one or several grades. The UGI® 209's resistance is much higher than that of UGI® 316L.


    Mass loss (g/m²/h)
    according to G48 A at 42°C (+/- 2°C)
    UGI® 316Lbetween 15 and 20
    UGI® 209<1.5
    UGI® 904L<1


    Pitting potential: The tests carried out in an NaCl environment with different concentrations and temperatures demonstrate the excellent behavior of UGI® 209 compared with UGI® 316L.


    Environment0.02 M NaCl at 23°C0.86 M NaCl at 55 °C
    UGI® 316LNo pittingPitting
    UGI® 209No pittingNo pitting
    UGI® 904LNo pittingPitting


    Crevice corrosion: The depassivation pH of the different grades in a NaCl (2M) solution at 23°C was determined. This test was introduced to report on the crevice corrosion phenomena. Its result corresponds to the pH below which the passive layer dissolves. The test values for the depassivation pH show the good resistance of UGI® 209.




    Depassivation pH

    UGI® 316L

    2+/-0.1

    UGI® 209

    1.1+/-0.1

    UGI® 904L

    1.2+/-0.1


    Stress corrosion: The NACE MR0175/ISO15156 test consists in determining the breaking conditions for standardized specimens. The usage limit for UGI® 209 given by the NACE MR0175/ISO15156 (condition 1 bar of H₂S in the NACE A solution) is T= 66°C. Our experimental tests show that UGI® 209 easily meets the test criteria, since no Fracture occurs at 60°C or even at 70°C. However, superficial cracks are visible at 70°C. (See the figure on the right side of the material page)

    General machinability

    The UGI® 209 is machined with the same equipment as the standard austenitic grades (AISI 304, 316), with the cutting conditions reduced by half. Due to the hardening of the grade through cold hardening, the use of carbide-coated tools is recommended. Ugitech will soon be distributing a specific guide on the subject.

    Heat Treatment

    Annealing solution

    We recommend performing the solution annealing and return to solution at a temperature between 1050 and 1100°C. For large sections, solution annealing and rapid water quenching is recommended.

    Hot forming

    UGI® 209 is suitable for forging, with the same equipment as that used for the 300 series austenitic steels, at higher power levels. No pre-heating is required. Heating to roughly 1200°C is recommended before the hot transformation, followed by rapid cooling. To guarantee good corrosion resistance results after forging, a treatment involving a return to a solution at about 1100°C followed by a solution annealing and rapid water quenching is preferable.

    Other

    In accordance with NACE MR0175, this grade can be used up to a hardness of 35HRc for applications in the oil industry in an H₂S environment.


    Available products:


    ProductsShapeSurface finishToleranceDimension


    Bar
    RoundRolled ans descaled12 to 1322 to 90 mm
    RoundTurned and polished9 to 1122 to 90 mm
    RoundDrawn8 to 91.8 to 55 mm
    RoundGround6 to 91.5 to 80 mm
    HexagonalDrawn113 to 55 mm
    Wire rodRoundPickled5.5 mm & 9.0 to 32 mm
    Drawn wireRoundMat0.05 to 14 mm
    ProfilBright2 to 70 mm²


    Other formats: contact the supplier

    Surface Treatment

    The pickling conditions for UGI® 209 are similar to those for a type AISI 904L steel.This grade can be electropolished.

    Welding

    The UGI® 209 grade can be easily welded using the appropriate settings for standard austenitic steels. The liquid zone should be protected from the ambient nitrogen to maintain a good level of intercrystalline corrosion resistance. While the 209 filler metal has the best properties, grades of the AISI 308L and AISI 309 type can also be used. After welding, to achieve the best performance we recommend a treatment in a solution at 1120°C followed by rapid cooling.