Sanicro® 25

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Description

Sanicro® 25 is an austenitic 22Cr25NiWCoCu stainless steel material with excellent high temperature properties, designed for use in advanced pulverized coal fired steam boilers. The grade is characterized by:


  • Very high creep strength
  • High oxidation resistance
  • High structural stability
  • Good fabricability

  • Datasheet URL:

    Sanicro® 25


    Datasheet updated 2020-08-20 14:48 (supersedes all previous editions)

    Related Standards

    Equivalent Materials

    This material data has been provided by Sandvik Materials Technology.

    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

    PropertyTemperatureValueComment

    Density

    23.0 °C

    8.1 g/cm³

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    Recycled Content

    82.1 %

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    Average recycled content

    Mechanical

    PropertyTemperatureValueComment

    Creep strength 10^4 cycles

    500.0 °C

    500 MPa

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    at 10000h

    550.0 °C

    380 MPa

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    at 10000h

    600.0 °C

    310 MPa

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    at 10000h

    650.0 °C

    230 MPa

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    at 10000h

    700.0 °C

    145 MPa

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    at 10000h

    750.0 °C

    85 MPa

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    at 10000h

    800.0 °C

    50 MPa

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    at 10000h

    Creep strength 10^5 cycles

    500.0 °C

    405 MPa

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    at 100000h

    550.0 °C

    325 MPa

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    at 100000h

    600.0 °C

    230 MPa

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    at 100000h

    650.0 °C

    155 MPa

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    at 100000h

    700.0 °C

    95 MPa

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    at 100000h

    750.0 °C

    50 MPa

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    at 100000h

    800.0 °C

    25 MPa

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    at 100000h

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    Elastic modulus

    20.0 °C

    197 GPa

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    100.0 °C

    191 GPa

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    200.0 °C

    183 GPa

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    300.0 °C

    175 GPa

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    400.0 °C

    168 GPa

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    500.0 °C

    160 GPa

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    600.0 °C

    153 GPa

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    700.0 °C

    145 GPa

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    800.0 °C

    137 GPa

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    Elongation

    23.0 °C

    40 %

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    min.

    Elongation A2

    23.0 °C

    40 %

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    min.

    Hardness, Vickers

    23.0 °C

    185 [-]

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    Tensile strength

    20.0 °C

    680 MPa

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    min.

    100.0 °C

    625 MPa

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    min.

    200.0 °C

    575 MPa

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    min.

    300.0 °C

    560 MPa

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    min.

    400.0 °C

    550 MPa

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    min.

    500.0 °C

    535 MPa

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    min.

    600.0 °C

    500 MPa

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    min.

    700.0 °C

    455 MPa

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    min.

    800.0 °C

    355 MPa

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    min.

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    Yield strength Rp0.1

    20.0 °C

    355 MPa

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    min.

    100.0 °C

    315 MPa

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    min.

    200.0 °C

    255 MPa

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    min.

    300.0 °C

    240 MPa

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    min.

    400.0 °C

    225 MPa

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    min.

    500.0 °C

    215 MPa

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    min.

    600.0 °C

    205 MPa

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    min.

    700.0 °C

    195 MPa

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    min.

    800.0 °C

    195 MPa

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    min.

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    Yield strength Rp0.2

    20.0 °C

    310 MPa

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    min.

    100.0 °C

    250 MPa

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    min.

    200.0 °C

    225 MPa

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    min.

    300.0 °C

    210 MPa

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    min.

    400.0 °C

    200 MPa

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    min.

    500.0 °C

    195 MPa

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    min.

    600.0 °C

    180 MPa

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    min.

    700.0 °C

    180 MPa

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    min.

    800.0 °C

    180 MPa

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    min.

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    Thermal

    PropertyTemperatureValueComment

    Coefficient of thermal expansion

    100.0 °C

    1.45E-5 1/K

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    for 30°C to the mentioned temperature

    200.0 °C

    1.5E-5 1/K

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    for 30°C to the mentioned temperature

    300.0 °C

    1.6E-5 1/K

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    for 30°C to the mentioned temperature

    400.0 °C

    1.6E-5 1/K

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    for 30°C to the mentioned temperature

    500.0 °C

    1.65E-5 1/K

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    for 30°C to the mentioned temperature

    600.0 °C

    1.65E-5 1/K

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    for 30°C to the mentioned temperature

    700.0 °C

    1.7E-5 1/K

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    for 30°C to the mentioned temperature

    800.0 °C

    1.7E-5 1/K

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    for 30°C to the mentioned temperature

    900.0 °C

    1.75E-5 1/K

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    for 30°C to the mentioned temperature

    1000.0 °C

    1.8E-5 1/K

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    for 30°C to the mentioned temperature

    1100.0 °C

    1.85E-5 1/K

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    Max service temperature

    750 °C

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    Specific heat capacity

    20.0 °C

    470 J/(kg·K)

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    100.0 °C

    485 J/(kg·K)

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    200.0 °C

    500 J/(kg·K)

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    300.0 °C

    520 J/(kg·K)

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    400.0 °C

    535 J/(kg·K)

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    500.0 °C

    555 J/(kg·K)

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    600.0 °C

    570 J/(kg·K)

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    700.0 °C

    585 J/(kg·K)

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    800.0 °C

    605 J/(kg·K)

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    900.0 °C

    620 J/(kg·K)

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    1000.0 °C

    640 J/(kg·K)

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    1100.0 °C

    665 J/(kg·K)

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    Thermal conductivity

    20.0 °C

    12 W/(m·K)

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    100.0 °C

    13 W/(m·K)

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    200.0 °C

    15 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

    20 W/(m·K)

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    600.0 °C

    22 W/(m·K)

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    700.0 °C

    23 W/(m·K)

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    800.0 °C

    25 W/(m·K)

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    900.0 °C

    27 W/(m·K)

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    1000.0 °C

    28 W/(m·K)

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    1100.0 °C

    30 W/(m·K)

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    Electrical

    PropertyTemperatureValue

    Electrical resistivity

    20.0 °C

    9.8E-7 Ω·m

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    Chemical properties

    PropertyValueComment

    Carbon

    0.1 %

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    max.

    Chromium

    22.5 %

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    Cobalt

    1.5 %

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    Copper

    3 %

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    Iron

    Balance

    Manganese

    0.5 %

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    Nickel

    25 %

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    Niobium

    0.5 %

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    Nitrogen

    0.23 %

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    Phosphorus

    0.03 %

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    max.

    Silicon

    0.2 %

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    Sulfur

    0.015 %

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    max.

    Tungsten

    3.6 %

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    Technological properties

    Property
    Application areas

    The high creep strength of Sanicro® 25 combined with its good corrosion resistance makes it an extremely suitable option for use in superheaters and reheaters in advanced coal fired power boilers. Use in high temperature applications in other types of steam boilers employing different fuel types is also possible. The material has been specifically developed for use at material temperatures up to around 700°C (1300°F).

    Certifications

    Approvals:

  • European Particular Material Appraisal (PMA)
  • VdTÜV material data sheet 555, 23.10.2018
  • The American Society of Mechanical Engineers (ASME) Boiler and Pressure
  • ASME Code Case 2753-1, Section I and 2752-1, Section VIII Division 1
  • China Pressure Vessel Approval CSCBPV BV-ME-210
  • Max allowable stress values according to ASME Code Case 2753-1, Section I and 2752-1, Section VIII Division 1.
  • Cold Forming

    Cold-bending should be followed by solution annealing if the cold deformation is >20% or the R/D ratio is ≤2.5, if the service temperature is in the creep range. For best corrosion properties at high temperatures it is recommended that solution annealing should be performed, even at lower degrees of cold forming. See also the Heat treatment section.

    Corrosion properties

    Hot corrosion: Sanicro® 25 has very good resistance to hot corrosion in a coal ash environment.


    Oxidation tests in air, performed as both isothermal tests at 650°C (1202°F) and 750°C (1382°F) for 1000, 2000 and 3000 hours and discontinuous tests with cooling to room temperature after 24, 50, 100, 200, 500, 1000, 1500, 2000 and 3000 hours, show a very low mass rate change.

    Oxidation tests in aqueous steam at 600°C (1112°F) and 700°C (1292°F) for 500 and 1000 hours respectively, showed that Sanicro® 25 has very good oxidation resistance.

    Heat Treatment

    Tubes are delivered in the heat treated condition. If additional heat treatment is needed due to further processing, the following is recommended.

    Solution annealing: 1180-1250°C (2155-2280°F) and quenched.

    Contact Sandvik for advice regarding further heat treatment issues.

    Hot forming

    The material can be bent at high as well as at low temperatures. Recommended temperature range for hot bending is 850-1250°C (1560-2280°F). Following hot bending, solution annealing is needed, unless the bending has been performed at controlled temperatures between 1180°C and 1250°C (2155°F and 2280°F).

    Other

    Forms of supply:

    Sanicro® 25 is supplied as cold pilgered solution annealed and white-pickled seamless tubes, in common reheater and superheater boiler tube dimensions.


    The VdTÜV-material datasheet 555, 23.10.2018, applies for outside diameter 25 mm to 114.3 mm and wall thickness 4.5 mm -12.5 mm.

    Welding

    The weldability of Sanicro® 25 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.


    In common with all fully austenitic stainless steels, Sanicro® 25 has low thermal conductivity and high thermal expansion. Welding plans should therefore be carefully selected in advance, so that distortions of the welded joint are minimized. If residual stresses are a concern, solution annealing can be performed after welding.


    For Sanicro® 25, 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 6617/AWS A5.14 ERNiCrCoMo-1 (e.g. Exaton Ni53, Alloy 617 mod)
    • MMA/SMAW welding
      • ISO 14172 E Ni 6117/AWS A5.11 ENiCrCoMo-1