Esshete 1250

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Description

Esshete 1250 is a fully austenitic chromium-nickel steel with excellent high- temperature strength and good resistance to corrosion in boiler applications. The grade can be used at temperatures up to about 650°C (1200°F), it is easily fabricated and also characterized by:


  • High strength in relation to other typical candidate austenitic alloys
  • Very good resistance to steam and flue gas atmospheres
  • Good structural stability at high temperatures
  • Good weldability

  • Datasheet URL:

    Esshete 1250


    Datasheet updated 2019-09-02 09:21 (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

    7.9 g/cm³

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    Recycled Content

    82.1 %

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    Average recycled content

    Mechanical

    PropertyTemperatureValueComment

    Creep strength 10^4 cycles

    600.0 °C

    241 MPa

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    at 10000h

    610.0 °C

    231 MPa

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    at 10000h

    620.0 °C

    221 MPa

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    at 10000h

    630.0 °C

    210 MPa

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    at 10000h

    640.0 °C

    198 MPa

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    at 10000h

    650.0 °C

    184 MPa

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    at 10000h

    660.0 °C

    167 MPa

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    at 10000h

    670.0 °C

    147 MPa

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    at 10000h

    680.0 °C

    124 MPa

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    at 10000h

    690.0 °C

    102 MPa

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    at 10000h

    700.0 °C

    86 MPa

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    at 10000h

    710.0 °C

    75 MPa

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    at 10000h

    720.0 °C

    67 MPa

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    at 10000h

    730.0 °C

    61 MPa

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    at 10000h

    740.0 °C

    55 MPa

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    at 10000h

    750.0 °C

    51 MPa

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    at 10000h

    760.0 °C

    46 MPa

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    at 10000h

    770.0 °C

    42 MPa

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    at 10000h

    780.0 °C

    38 MPa

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    at 10000h

    790.0 °C

    34 MPa

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    at 10000h

    Creep strength 10^5 cycles

    600.0 °C

    199 MPa

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    at 100000h

    610.0 °C

    185 MPa

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    at 100000h

    620.0 °C

    167 MPa

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    at 100000h

    630.0 °C

    147 MPa

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    at 100000h

    640.0 °C

    122 MPa

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    at 100000h

    650.0 °C

    100 MPa

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    at 100000h

    660.0 °C

    84 MPa

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    at 100000h

    670.0 °C

    74 MPa

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    at 100000h

    680.0 °C

    66 MPa

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    at 100000h

    690.0 °C

    59 MPa

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    at 100000h

    700.0 °C

    54 MPa

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    at 100000h

    710.0 °C

    49 MPa

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    at 100000h

    720.0 °C

    45 MPa

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    at 100000h

    730.0 °C

    40 MPa

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    at 100000h

    740.0 °C

    36 MPa

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    at 100000h

    750.0 °C

    30 MPa

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    at 100000h

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    Creep strength 25x10^4 cycles

    600.0 °C

    177 MPa

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    at 250000h

    610.0 °C

    158 MPa

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    at 250000h

    620.0 °C

    134 MPa

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    at 250000h

    630.0 °C

    109 MPa

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    at 250000h

    640.0 °C

    90 MPa

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    at 250000h

    650.0 °C

    78 MPa

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    at 250000h

    660.0 °C

    69 MPa

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    at 250000h

    670.0 °C

    52 MPa

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    at 250000h

    680.0 °C

    56 MPa

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    at 250000h

    700.0 °C

    46 MPa

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    at 250000h

    710.0 °C

    42 MPa

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    at 250000h

    720.0 °C

    37 MPa

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    at 250000h

    730.0 °C

    32 MPa

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    at 250000h

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    Elastic modulus

    20.0 °C

    192 GPa

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    100.0 °C

    184 GPa

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    200.0 °C

    176 GPa

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    300.0 °C

    168 GPa

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    400.0 °C

    160 GPa

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    500.0 °C

    151 GPa

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    600.0 °C

    143 GPa

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    700.0 °C

    135 GPa

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    800.0 °C

    127 GPa

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    900.0 °C

    120 GPa

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    Elongation

    23.0 °C

    35 %

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    min.

    Elongation A2

    23.0 °C

    35 %

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    min.

    Hardness, Rockwell B

    23.0 °C

    90 [-]

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    max.

    Tensile strength

    23.0 °C

    540 - 740 MPa

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    Yield strength Rp0.1

    20.0 °C

    270 MPa

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    min.

    50.0 °C

    254 MPa

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    min.

    100.0 °C

    232 MPa

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    min.

    150.0 °C

    210 MPa

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    min.

    200.0 °C

    195 MPa

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    min.

    250.0 °C

    190 MPa

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    min.

    300.0 °C

    187 MPa

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    min.

    350.0 °C

    184 MPa

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    min.

    400.0 °C

    182 MPa

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    min.

    450.0 °C

    179 MPa

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    min.

    500.0 °C

    178 MPa

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    min.

    550.0 °C

    175 MPa

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    min.

    600.0 °C

    170 MPa

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    min.

    650.0 °C

    165 MPa

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    min.

    700.0 °C

    159 MPa

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    min.

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    Yield strength Rp0.2

    20.0 °C

    230 MPa

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    min.

    50.0 °C

    213 MPa

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    min.

    100.0 °C

    188 MPa

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    min.

    150.0 °C

    171 MPa

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    min.

    200.0 °C

    161 MPa

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    min.

    250.0 °C

    153 MPa

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    min.

    300.0 °C

    148 MPa

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    min.

    350.0 °C

    145 MPa

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    min.

    400.0 °C

    144 MPa

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    min.

    450.0 °C

    141 MPa

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    min.

    500.0 °C

    139 MPa

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    min.

    550.0 °C

    136 MPa

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    min.

    600.0 °C

    133 MPa

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    min.

    650.0 °C

    130 MPa

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    min.

    700.0 °C

    125 MPa

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    min.

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    Thermal

    PropertyTemperatureValueComment

    Coefficient of thermal expansion

    100.0 °C

    1.5E-5 1/K

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    for 30°C to the mentioned temperature

    200.0 °C

    1.6E-5 1/K

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    for 30°C to the mentioned temperature

    300.0 °C

    1.7E-5 1/K

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    for 30°C to the mentioned temperature

    400.0 °C

    1.8E-5 1/K

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    for 30°C to the mentioned temperature

    500.0 °C

    1.85E-5 1/K

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    for 30°C to the mentioned temperature

    600.0 °C

    1.9E-5 1/K

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    for 30°C to the mentioned temperature

    700.0 °C

    1.9E-5 1/K

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    for 30°C to the mentioned temperature

    800.0 °C

    1.95E-5 1/K

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    for 30°C to the mentioned temperature

    900.0 °C

    2E-5 1/K

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    for 30°C to the mentioned temperature

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    Specific heat capacity

    100.0 °C

    505 J/(kg·K)

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    for 20°C to the mentioned temperature

    200.0 °C

    530 J/(kg·K)

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    for 20°C to the mentioned temperature

    300.0 °C

    540 J/(kg·K)

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    for 20°C to the mentioned temperature

    400.0 °C

    545 J/(kg·K)

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    for 20°C to the mentioned temperature

    500.0 °C

    555 J/(kg·K)

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    for 20°C to the mentioned temperature

    600.0 °C

    560 J/(kg·K)

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    for 20°C to the mentioned temperature

    700.0 °C

    565 J/(kg·K)

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    for 20°C to the mentioned temperature

    800.0 °C

    575 J/(kg·K)

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    for 20°C to the mentioned temperature

    900.0 °C

    580 J/(kg·K)

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    for 20°C to the mentioned temperature

    1000.0 °C

    585 J/(kg·K)

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    for 20°C to the mentioned temperature

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    Thermal conductivity

    20.0 °C

    13 W/(m·K)

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    100.0 °C

    14 W/(m·K)

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    200.0 °C

    15 W/(m·K)

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    300.0 °C

    17 W/(m·K)

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    400.0 °C

    19 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

    24 W/(m·K)

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    Electrical

    PropertyTemperatureValue

    Electrical resistivity

    20.0 °C

    7.4E-7 Ω·m

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    100.0 °C

    8E-7 Ω·m

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    200.0 °C

    8.8E-7 Ω·m

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    300.0 °C

    9.4E-7 Ω·m

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    400.0 °C

    1E-6 Ω·m

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    500.0 °C

    1.05E-6 Ω·m

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    600.0 °C

    1.09E-6 Ω·m

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    700.0 °C

    1.13E-6 Ω·m

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    800.0 °C

    1.16E-6 Ω·m

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    900.0 °C

    1.18E-6 Ω·m

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    1000.0 °C

    1.2E-6 Ω·m

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    Chemical properties

    PropertyValueComment

    Boron

    5E-3 %

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    Carbon

    0.1 %

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    Chromium

    15 %

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    Iron

    Balance

    Manganese

    6.3 %

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    Molybdenum

    1 %

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    Nickel

    9.5 %

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    Niobium

    1 %

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    Phosphorus

    0.04 %

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    max.

    Silicon

    0.5 %

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    Sulfur

    0.015 %

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    max.

    Vanadium

    0.3 %

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    Technological properties

    Property
    Application areas

    The high creep strength of Esshete 1250, combined with its good resistance to steam and flue gas atmospheres, makes it a very suitable material for use in coal-fired boilers. The grade was developed in the United Kingdom in the 1960's, and the bulk of the material has been used in the UK power industry in 500 and 660 MW boilers.


    The main application has been superheaters and reheaters operating at 570°C (1058°F), steam pressure 170 bar (superheaters) and 40 bar (reheaters). Typical metal temperature 600–700°C (1112–1292°F), in flue gas temperature 900–1200°C (1652–2192°F). The corrosion environment on the fireside in the UK boilers was historically very aggressive as the British coal has, typically a high chlorine content of up to 0.6%, sulphur at 1–2% and a high ash content of 20%.


    Esshete 1250 has also been used successfully in superheaters in biomass boilers, burning various biofuels and producing steam at 580–540°C (1076–1004°F) at 60–200 bars pressure.


    Trademark information: Esshete 1250 is a trademark owned by Corus

    Certifications

    Approvals: VdTÜV-Werkstoffblatt 520 and PED (Pressure Equipment Directive) 2014/68/EU

    Cold Forming

    Esshete 1250 can be cold bent to narrow bending radii. Heat treatment after cold bending is not normally necessary, but this must be decided after considering the degree of bending and the operating conditions. If post bending heat treatment is carried out, it should be in the form of solution annealing.

    Corrosion properties

    Air: Good resistance to scaling up to 800°C (1472°F).


    Gaseous corrosion: Good resistance to steam and flue gas atmospheres. In service conditions typical of coal-fired boilers, the alloy has a very similar fireside corrosion to alloys of the ASTM 316H type. However, the much increased high-temperature strength gives significantly improved service performance. Fireside corrosion resistance in coal-fired, biomass-fired or coal/biomass co-fired boilers is similar to that of type ASTM 347H. Steam-side corrosion is similar to that of type ASTM 347H.

    Heat Treatment

    Tubes are delivered in the heat treated 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.

    Solution annealing: 1050–1150°C (1920–2100°F), 5–20 minutes, rapid cooling in air, gas or water.

    Hot forming

    Hot bending is carried out at 1100–850°C (1832–1652°F) and should be followed by solution annealing.

    Other

    Forms of supply:

    Seamless tube and pipe in Esshete 1250 is supplied in dimensions up to 260 mm (10.24 in.) outside diameter, in the solution annealed and white-pickled condition or in the bright annealed condition.

    Structural Stability

    As in other austenitic stainless steels, sigma phase can be formed after long heat treatment in the range 550–950°C (1022–1742oF). Due to the low chromium content, Esshete 1250 is significantly less sensitive to sigma phase formation than steels of e.g. the ASTM 316 type, according to tests involving ageing for 100000 h.

    Welding

    The weldability of Esshete 1250 is good. Welding must be carried out without preheating and subsequent heat treatment is normally not required. 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 Esshete 1250, heat input of <1.5 kJ/mm and interpass temperature of <150°C (300°F) are recommended.


    Recommended filler metals:

    • TIG/GTAW or MIG/GMAW welding
      • ISO 18274 S Ni 6082 / AWS A5.14 ERNiCr-3 (e.g. Exaton Ni72HP)
    • MMA/SMAW welding
      • ISO 14172 E Ni 6182/ AWS A5.11 ENiCrFe-3 (e.g. Exaton Ni71)