Sanicro® 69

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Description

Sanicro® 69 is an austenitic nickel-chromium-iron alloy used primarily for steam generators in nuclear power plants (PWR). For this application it is used in the 'thermally treated' condition. This treatment results in chromium carbide precipitation at the grain boundaries but no significant chromium depletion. The grade has good structure stability and good weldability.


For the steam generator application the material is characterized by:

  • Extremely high resistance against stress corrosion cracking in primary side PWR water conditions
  • Improved pitting corrosion resistance in chloride containing solutions compared with Alloy 600
  • Sanicro® 69 is also characterized by:

  • Good corrosion resistance in caustic environments
  • Excellent performance in nitric acid solutions

  • For steam generator applications Sanicro® 69 is delivered to the most stringent individual specifications in order to assure maximum reliable performance in nuclear power plants.


    More technical information and charts that are relevant to the materials corrosion, mechanical and physical performance are displayed in the figures on the right side of the material page.


    Datasheet URL:

    Sanicro® 69


    Datasheet updated 2020-05-07 13:07 (supersedes all previous editions)

    Related Standards

    Equivalent Materials

    Los datos sobre este material han sido proporcionados por Sandvik Materials Technology.

    A menos que se indique lo contrario, todas las medidas corresponden a condiciones de temperatura ambiente. A menos que se indique lo contrario, se utilizan las unidades del SI.
    Las normas armonizadas son similares a uno o varios estándares del proveedor. Es posible que algunas normas armonizadas se ajusten al estándar original, mientras que otras pueden quedar fuera de su alcance.

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    Propiedades

    General

    PropertyTemperatureValue

    Densidad

    23.0 °C

    8.12 g/cm³

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    Mecánica

    PropertyTemperatureValueComment

    Dureza Vickers

    23.0 °C

    160 [-]

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    Elongación

    23.0 °C

    30 %

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    min.

    Límite elástico Rp 0,2

    20.0 °C

    240 MPa

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    higher values for steam generator tubing in the thermally treated condition can be achieved (280 MPa at 20°C)

    100.0 °C

    220 MPa

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    higher values for steam generator tubing in the thermally treated condition can be achieved (280 MPa at 20°C)

    200.0 °C

    190 MPa

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    higher values for steam generator tubing in the thermally treated condition can be achieved (280 MPa at 20°C)

    300.0 °C

    187 MPa

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    higher values for steam generator tubing in the thermally treated condition can be achieved (280 MPa at 20°C)

    400.0 °C

    184 MPa

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    higher values for steam generator tubing in the thermally treated condition can be achieved (280 MPa at 20°C)

    500.0 °C

    180 MPa

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    higher values for steam generator tubing in the thermally treated condition can be achieved (280 MPa at 20°C)

    600.0 °C

    175 MPa

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    higher values for steam generator tubing in the thermally treated condition can be achieved (280 MPa at 20°C)

    700.0 °C

    150 MPa

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    higher values for steam generator tubing in the thermally treated condition can be achieved (280 MPa at 20°C)

    Módulo elástico

    20.0 °C

    210 GPa

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    100.0 °C

    206 GPa

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    200.0 °C

    201 GPa

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    300.0 °C

    195 GPa

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    400.0 °C

    189 GPa

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    500.0 °C

    182 GPa

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    600.0 °C

    174 GPa

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    Resistencia a la tracción

    20.0 °C

    585 MPa

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    min.

    100.0 °C

    550 MPa

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    min.

    200.0 °C

    510 MPa

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    min.

    300.0 °C

    495 MPa

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    min.

    400.0 °C

    490 MPa

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    min.

    500.0 °C

    480 MPa

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    min.

    600.0 °C

    440 MPa

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    min.

    700.0 °C

    340 MPa

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    min.

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    Energía de impacto Charpy

    Since Sanicro® 69 is a fully austenitic alloy it possesses good toughness down to -196°C (-320°F)

    Aplicaciones térmicas

    PropertyTemperatureValueComment

    Calor específico

    23.0 °C

    460 J/(kg·K)

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    100.0 °C

    480 J/(kg·K)

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    200.0 °C

    495 J/(kg·K)

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    300.0 °C

    505 J/(kg·K)

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    400.0 °C

    510 J/(kg·K)

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    500.0 °C

    520 J/(kg·K)

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    600.0 °C

    580 J/(kg·K)

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    Coeficiente de dilatación térmica

    100.0 °C

    1.35E-5 1/K

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    for 30°C to the mentioned temperature

    200.0 °C

    1.4E-5 1/K

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    for 30°C to the mentioned temperature

    300.0 °C

    1.45E-5 1/K

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    for 30°C to the mentioned temperature

    400.0 °C

    1.5E-5 1/K

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    for 30°C to the mentioned temperature

    500.0 °C

    1.55E-5 1/K

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    for 30°C to the mentioned temperature

    600.0 °C

    1.55E-5 1/K

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    for 30°C to the mentioned temperature

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    Conductividad térmica

    23.0 °C

    11 W/(m·K)

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    100.0 °C

    13 W/(m·K)

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    200.0 °C

    14 W/(m·K)

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    300.0 °C

    16 W/(m·K)

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    400.0 °C

    18 W/(m·K)

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    500.0 °C

    19 W/(m·K)

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    600.0 °C

    23 W/(m·K)

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    Eléctrico

    PropertyTemperatureValue

    Resistividad eléctrica

    20.0 °C

    1.11E-6 Ω·m

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    100.0 °C

    1.14E-6 Ω·m

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    200.0 °C

    1.18E-6 Ω·m

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    300.0 °C

    1.22E-6 Ω·m

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    400.0 °C

    1.24E-6 Ω·m

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    Chemical properties

    PropertyValueComment

    Aluminio

    10 %

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    Azufre

    0.015 %

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    max.

    Carbono

    0.02 %

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    Cobalto

    0.05 %

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    Lower contents can be specified after agreement.

    Cromo

    30 %

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    Fósforo

    0.02 %

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    max.

    Hierro

    Balance

    Manganeso

    0.5 %

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    max.

    Níquel

    60 %

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    Silicona

    0.5 %

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    max.

    Technological properties

    Property
    Application areas

    Sanicro® 69 is used in:

  • Steam generators in nuclear power plants.
  • Units in contact with nitric acid at elevated temperatures.
  • Equipment requiring high resistance to oxidation, carburization and nitriding.
  • Units exposed to caustic solutions at high temperature.
  • Certifications

    Approvals:

  • ASME Boiler and Pressure Vessel Code Case N-20 and N-474
  • AFCEN RCCM M4105
  • Cold Forming

    The excellent formability of Sanicro® 69 permits cold-bending to very small bending radii. Annealing is normally not necessary after cold-bending owing to the high stress corrosion cracking resistance for Sanicro® 69.

    Corrosion properties

    Stress corrosion cracking: The thermally treated condition of Sanicro® 69 is developed specifically to resist stress corrosion cracking in steam generator environment at nuclear power plants. This has been confirmed by laboratory stress corrosion cracking tests in pure water (less than 5 ppm oxygen, 4-5 ppm hydrogen added) at 365°C (690°F).

    No stress corrosion cracking was developed in Sanicro® 69 during the entire test period of 33 000 hours. Alloy 600 started to crack after 200 hours.


    Intergranular corrosion: Sanicro® 69 has good resistance to intergranular corrosion in both the thermally treated condition and the solution annealed condition. Typical corrosion rates in the Huey test (65% HNO₃, 5 x 48h, ASTM A262 Practice C) are 0.06 mm/year (2.4 mpy).

    The figure on the right side shows a TTS diagram for a heat of Sanicro® 69 with 0.03% carbon tested in the Huey test. The initial material was annealed at 1040°C (1900°F), 20 min/WQ. As can be seen there is a very narrow area where Sanicro® 69 shows some tendency for sensitization.


    General corrosion: Sanicro® 69 and Alloy C-276 have been corrosion tested in 20% HNO₃+ 4%HF at 65°C (150°F). Sanicro® 69 had a corrosion rate of 0.625 mm/year (24.6 mpy) while Alloy C-276 suffered a corrosion rate of 23.7 mm/year (933 mpy).

    Expanding

    Sanicro® 69 is expanded into tube sheets in the same way as standard austenitic stainless steels.

    Heat Treatment

    For steam generator application the tubes are delivered in the thermally treated conditions. This means exposure at about 720°C (1330°F) for normally 10 hours. Prior to the thermal treatment the tubes are solution annealed at approximately 1100 °C (2010°F) for some minutes.

    For other applications the tubes are delivered in the solution annealed condition. If additional solution annealing is necessary after further processing the following procedure is recommended:

    1050-1150°C (1920-2100°F), 1-10 minutes, rapid cooling in air or water.

    Other

    Forms of supply:

    Seamless tube and pipe are supplied in the size range from 1/4" O.D. (6.35 mm) to 4" O.D. (101.6 mm) in wall thickness from 0.030" (0.9 mm) to 1" (25.4 mm).


    Tube and pipe are delivered in the solution annealed and pickled condition.


    PWR steam generator tubes are delivered in the bright annealed and thermally treated condition. The thermal treatment involves a treatment in vacuum furnace at about 720°C (1330°F) for normally 10 hours.

    Welding

    The weldability of Sanicro® 69 is good. Suitable methods of fusion welding are manual metal-arc welding (MMA/SMAW) and gas-shielded arc welding, with the TIG/GTAW method as first choice.


    For Sanicro® 69, heat-input of <1.0 kJ/mm and interpass temperature of <100°C (210°F) are recommended. A string bead welding technique should be used.


    Recommended filler metals:

    • TIG/GTAW or MIG/GMAW welding
      • ISO 18274 S Ni 6052/AWS A5.14 ERNiCrFe-7 (e.g. Exaton Ni68HP)
    • MMA/SMAW welding
      • ISO 14172 E Ni 6152/AWS A5.11 ENiCrFe-7 (e.g. Exaton Ni69)


    Overlay welding:

  • ISO 18274 S Ni 6043/AWS A5.14 ERNiCrFe-14 (e.g. Exaton Ni69HPQ) strip electrode is recommended for overlay welding of tube sheets and high-pressure vessels in cases where corrosion resistance, equal to that of Sanicro® 69, is required.