EN 10028-5 Grade P420K4

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Description

P420M HT is a high strength thermomechanically rolled fine grained structural steel with a minimum yield strength of 420 MPa (61 ksi) in its delivered condition (referring to the lowest thickness range). P420M HT is preferentially used for constructions within the steel and cement industry and constructions of installations, which require enhanced properties at elevated temperatures and which have to meet high safety standards. Due to its chemical composition and its low carbon equivalent, this steel has an excellent weldability and possesses high mechanical properties at elevated temperatures.

P420M HT can be delivered in two grades:

  • Basic quality (L2) with minimum impact values at -20 °C: P420M HT L2
  • Low temperature quality (K4) with minimum impact values at -40 °C: P420M HT K4 This specification applies to heavy plates with thicknesses of 10 to 100 mm.

  • Related Standards

    This material data has been provided by Matmatch.

    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.

    Ashby charts

    Properties

    General

    PropertyValueComment

    Carbon equivalent thyssen

    0.26 [-]

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    max.

    0.23 [-]

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    50 mm thick plate

    0.24 [-]

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    80 mm thick plate

    International welding carbon equivalent

    0.39 [-]

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    max.

    0.36 [-]

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    50 mm thick plate

    0.37 [-]

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    80 mm thick plate

    Mechanical

    PropertyTemperatureValueComment

    Charpy impact energy, V-notch

    -40 °C

    40 J

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    min., average

    Charpy impact energy, V-notch, transverse

    -40 °C

    27 J

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    min., average

    Creep strength 10^4 cycles

    400 °C

    380 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles

    410 °C

    360 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles

    420 °C

    355 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles

    430 °C

    339 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles

    440 °C

    323 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles

    450 °C

    305 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles

    460 °C

    287 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles

    470 °C

    267 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles

    480 °C

    247 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles

    490 °C

    226 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles

    500 °C

    204 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles

    510 °C

    180 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles

    520 °C

    156 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles

    530 °C

    131 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles

    540 °C

    105 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles

    550 °C

    78 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles

    Creep strength 10^5 cycles

    400 °C

    330 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^5 cycles

    410 °C

    312 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^5 cycles

    420 °C

    293 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^5 cycles

    430 °C

    274 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^5 cycles

    440 °C

    253 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^5 cycles

    450 °C

    231 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^5 cycles

    460 °C

    208 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^5 cycles

    470 °C

    184 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^5 cycles

    480 °C

    159 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^5 cycles

    490 °C

    133 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^5 cycles

    500 °C

    106 MPa

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    1% creep strain, Larson Miller method, up to 33 000 hours, 10^5 cycles

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    Tensile strength

    23 °C

    500.0 - 660.0 MPa

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    transverse test speciemen, thickness ≤ 100mm

    100 °C, 200 °C

    310.0 - 335.0 MPa

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    transverse test speciemen, thickness ≤ 100mm

    300 °C

    275.0 - 295.0 MPa

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    transverse test speciemen, thickness ≤ 100mm

    400 °C

    250.0 - 275.0 MPa

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    transverse test speciemen, thickness ≤ 100mm

    500 °C

    235.0 - 250.0 MPa

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    transverse test speciemen, thickness ≤ 100mm

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    Yield strength

    390.0 - 420.0 MPa

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    min., ReH, depending on the thickness, If not apparent, the yield strength Rp0.2 is measured, transverse test specimen

    Chemical properties

    PropertyValueComment

    Aluminium

    0.02 %

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    min.

    Carbon

    0.1

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    max.

    Manganese

    1.4

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    max.

    Molybdenum

    0.5

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    max.

    Niobium

    0.05

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    max.

    Nitrogen

    0.02

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    max.

    Phosphorus

    0.02

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    max.

    Silicon

    0.35000000000000003

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    max.

    Sulfur

    0.01

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    max.

    Vanadium

    0.12

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    max.

    Technological properties

    Property
    Cold Forming

    P420M HT has excellent cold forming properties. The only thing to note is that cold forming at temperatures below 150 °C leads to an increase of the hardness and a decrease of the toughness. These changes in mechanical properties can be partially recovered by a subsequent stress relieving. In case of higher cold forming ratios it is advisable to consult the steel manufacturer prior to placing the order or to monitor the effect of cold forming. Regulations for pressure vessels limit cold forming, if no additional normalising or quenching and tempering is performed. This demand can restrict the use of TMCP-steel for construction parts with a high cold forming rate. P420M HT has excellent forming properties up to a temperature of 600 °C. Forming at temperatures above 600 °C leads to changes in the original microstructure and cannot be recommended. It is impossible to reestablish the same material properties that had been achieved during the original manufacture through a further heat treatment.

    Heat Treatment

    The stress relieving is carried out between 530 and 600 °C followed by cooling in still air. The total holding time should not exceed 150 minutes, even if several operations are carried out. With holding times of more than 90 minutes the lower limit of the temperature range should to be aimed at. Flame straightening should be carried according to special work instruction (see Technical Information of Dillinger “DI-MC - Structural steels“).

    Welding

    P420M HT has an excellent weldability if the general technical rules are observed (see SEW 088 or EN 1011). The risk of cold cracking is low which can be concluded from the low values for Pcm and CET. Hardening of the heat affected zone is low. For a wide range of welding parameters excellent properties in the HAZ have been reached.