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Sandvik 7RE10: Premium Austenitic Stainless Steel for High-Temperature Applications

Sandvik 7RE10 is an austenitic, stainless chromium-nickel steel of the 25/20 type, suitable for high-temperature applications. The grade is characterized by:


  • Good resistance to carburization, sulphidation, and oxidation combined with moderate creep strength and structural stability.
  • A maximum service temperature in air of 1100°C (2010°F).


    • Datasheet URL:

    Sandvik 7RE10


    Datasheet updated 2020-04-23 11:17 (supersedes all previous editions)

    Properties

    General

    PropertyTemperatureValueComment

    Density

    23.0 °C

    7.9 g/cm³

    Recycled Content

    82.1 %

    Average recycled content

    Mechanical

    PropertyTemperatureValueComment

    Creep strength 10^4 cycles

    525.0 °C

    155 MPa

    at 10000h, average values

    550.0 °C

    133 MPa

    at 10000h, average values

    575.0 °C

    113 MPa

    at 10000h, average values

    600.0 °C

    96 MPa

    at 10000h, average values

    625.0 °C

    81 MPa

    at 10000h, average values

    650.0 °C

    68 MPa

    at 10000h, average values

    675.0 °C

    55 MPa

    at 10000h, average values

    700.0 °C

    44 MPa

    at 10000h, average values

    725.0 °C

    36 MPa

    at 10000h, average values

    750.0 °C

    30 MPa

    at 10000h, average values

    775.0 °C

    25 MPa

    at 10000h, average values

    800.0 °C

    21 MPa

    at 10000h, average values

    825.0 °C

    18 MPa

    at 10000h, average values

    850.0 °C

    15 MPa

    at 10000h, average values

    875.0 °C

    12 MPa

    at 10000h, average values

    900.0 °C

    10 MPa

    at 10000h, average values

    925.0 °C

    8 MPa

    at 10000h, average values

    950.0 °C

    6 MPa

    at 10000h, average values

    Creep strength 10^5 cycles

    525.0 °C

    105 - 155 MPa

    at 100000h, average values

    550.0 °C

    85 MPa

    at 100000h, average values

    575.0 °C

    68 MPa

    at 100000h, average values

    600.0 °C

    56 MPa

    at 100000h, average values

    625.0 °C

    45 MPa

    at 100000h, average values

    650.0 °C

    36 MPa

    at 100000h, average values

    675.0 °C

    29 MPa

    at 100000h, average values

    700.0 °C

    24 MPa

    at 100000h, average values

    725.0 °C

    20 MPa

    at 100000h, average values

    750.0 °C

    17 MPa

    at 100000h, average values

    775.0 °C

    14 MPa

    at 100000h, average values

    800.0 °C

    11 MPa

    at 100000h, average values

    825.0 °C

    9 MPa

    at 100000h, average values

    850.0 °C

    7 MPa

    at 100000h, average values

    875.0 °C

    5 MPa

    at 100000h, average values

    900.0 °C

    4 MPa

    at 100000h, average values

    925.0 °C

    4 MPa

    at 100000h, average values

    950.0 °C

    3 MPa

    at 100000h, average values

    Elastic modulus

    20.0 °C

    195 GPa

    100.0 °C

    190 GPa

    200.0 °C

    182 GPa

    300.0 °C

    174 GPa

    400.0 °C

    166 GPa

    500.0 °C

    158 GPa

    Elongation

    23.0 °C

    35 %

    min.

    Elongation A2

    23.0 °C

    35 %

    min.

    Hardness, Rockwell B

    23.0 °C

    90 [-]

    max.

    Tensile strength

    23.0 °C

    530 - 750 MPa

    Yield strength Rp0.1

    20.0 °C

    250 MPa

    min.

    50.0 °C

    238 MPa

    min.

    100.0 °C

    217 MPa

    min.

    150.0 °C

    201 MPa

    min.

    200.0 °C

    186 MPa

    min.

    250.0 °C

    175 MPa

    min.

    300.0 °C

    166 MPa

    min.

    350.0 °C

    159 MPa

    min.

    400.0 °C

    154 MPa

    min.

    450.0 °C

    150 MPa

    min.

    500.0 °C

    148 MPa

    min.

    550.0 °C

    146 MPa

    min.

    Yield strength Rp0.2

    20.0 °C

    220 MPa

    min.

    50.0 °C

    213 MPa

    min.

    100.0 °C

    192 MPa

    min.

    150.0 °C

    176 MPa

    min.

    200.0 °C

    161 MPa

    min.

    250.0 °C

    150 MPa

    min.

    300.0 °C

    141 MPa

    min.

    350.0 °C

    134 MPa

    min.

    400.0 °C

    129 MPa

    min.

    450.0 °C

    125 MPa

    min.

    500.0 °C

    123 MPa

    min.

    550.0 °C

    121 MPa

    min.

    Thermal

    PropertyTemperatureValueComment

    Coefficient of thermal expansion

    100.0 °C

    1.55E-5 1/K

    for 20°C to the mentioned temperature

    200.0 °C

    1.5E-5 1/K

    for 20°C to the mentioned temperature

    300.0 °C

    1.55E-5 1/K

    for 20°C to the mentioned temperature

    400.0 °C

    1.6E-5 1/K

    for 20°C to the mentioned temperature

    500.0 °C

    1.65E-5 1/K

    for 20°C to the mentioned temperature

    600.0 °C

    1.7E-5 1/K

    for 20°C to the mentioned temperature

    700.0 °C

    1.75E-5 1/K

    for 20°C to the mentioned temperature

    800.0 °C

    1.85E-5 1/K

    for 20°C to the mentioned temperature

    900.0 °C

    1.9E-5 1/K

    for 20°C to the mentioned temperature

    1000.0 °C

    1.9E-5 1/K

    for 20°C to the mentioned temperature

    Specific heat capacity

    20.0 °C

    470 J/(kg·K)

    100.0 °C

    495 J/(kg·K)

    200.0 °C

    530 J/(kg·K)

    300.0 °C

    555 J/(kg·K)

    400.0 °C

    580 J/(kg·K)

    500.0 °C

    600 J/(kg·K)

    600.0 °C

    615 J/(kg·K)

    700.0 °C

    630 J/(kg·K)

    Thermal conductivity

    20.0 °C

    13 W/(m·K)

    100.0 °C

    15 W/(m·K)

    200.0 °C

    17 W/(m·K)

    300.0 °C

    19 W/(m·K)

    400.0 °C

    21 W/(m·K)

    500.0 °C

    23 W/(m·K)

    600.0 °C

    25 W/(m·K)

    700.0 °C

    26 W/(m·K)

    Chemical properties

    PropertyValueComment

    Carbon

    0.06 %

    max.

    Chromium

    24.5 %

    Iron

    Balance

    Manganese

    1.5 %

    max.

    Nickel

    21 %

    Phosphorus

    0.03 %

    max.

    Silicon

    0.75 %

    max.

    Sulfur

    0.015 %

    max.

    Technological properties

    Property
    Application areas

    The good, general high temperature corrosion resistance of Sandvik 7RE10 makes it suitable for a wide range of applications:

  • Furnace tubes
  • Recuperators
  • Muffle tubes in continuous wire annealing furnaces
  • Thermocouple protection tubes
  • Radiant tubes
  • Tube hangers in petroleum and steam boilers
  • Burners

    • Cold Forming

    Annealing after cold bending is not normally necessary, but this should be reviewed depending on the degree of bending and the operating conditions.

    Heat treatment, if any, should take the form of stress relieving or solution annealing. See under "Heat treatment". Solution annealing is recommended for tubes used at temperatures above 750°C (1380°F), and when the highest possible creep strength is required in the bent tube.

    Corrosion properties

    Sandvik 7RE10 has very good resistance to oxidation and sulphidation. It can be used in:

  • Air up to 1100°C (2010°F)
  • Sulphur-containing atmospheres up to 650-1050°C (1200-1920°F), depending on service conditions. Factors to consider are whether the atmosphere is oxidizing or reducing and whether impurities such as sodium and vanadium are present


    • The high chromium content of Sandvik 7RE10 makes the material resistant to oxidizing aqueous solutions. Sandvik 7RE10 also has better resistance to chloride induced stress corrosion cracking than lower alloyed steels of type ASTM 304 and 316.

    Sandvik 7RE10 has good resistance in cyanide melts and neutral salts melts at high temperature. The material is insensitive to "green rot" attack.

    Heat Treatment

    Tubes are generally delivered in the solution annealed condition. If another heat treatment is needed after further processing the following is recommended:

    Stress relieving: 850-950°C (1560-1740°F), 10-15 minutes, cooling in air. The temperature should not be allowed to fall below 850°C (1560°F), because of the risk of sensitization.

    Solution annealing: 1000-1150°C (1830-2100°F), 5-20 minutes, rapid cooling in air or water.

    Hot forming

    Hot bending is carried out at 1100-850°C (2010-1560°F) and should be followed by solution annealing.

    Other

    Forms of supply:

    Seamless tube and pipe in Sandvik 7RE10 is supplied in dimensions up to 260 mm outside diameter, in the solution annealed and white-pickled condition or in the bright annealed condition.


    Stock sizes: Sandvik 7RE10 is stocked in sizes ranging from 13.5 mm to 168.28 mm (6") outside diameter. Additional data concerning sizes and finishes is available on request from your nearest Sandvik office.

    Structural Stability

    Like other austenitic stainless steels, Sandvik 7RE10 has better structural stability than high alloyed ferritic steels. At temperatures between 800 and 900°C (1470-1650°F), however, the structural stability will be slightly impaired. For service in this temperature range, we recommend the use of Sanicro 31HT, which has better structural stability.

    Welding

    The weldability of Sandvik 7RE10 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, Sandvik 7RE10 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. Welding of fully austenitic stainless steel can entail the risk of hot cracking in the welded joints, particularly under high constraint.


    For Sandvik 7RE10, 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 14343 S 25 20 / AWS A5.9 ER310 (e.g. Exaton 25.20.C)
    • MMA/SMAW welding
      • ISO 3581 E 25 20 B / AWS A5.4 E310-15 (e.g. Exaton 25.20.B)


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