EN 10028-5 Grade P420MHTL2

EN 10028-5 Grade P420MHTL2

EN 10028-5 Grade P420MHTL2 introduction

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.

EN 10028-5 Grade P420MHTL2 general

Property Value Comment
Carbon equivalent (CET) Carbon equivalent (CET) of 0.23 [-] 50 mm thick plate
- Carbon equivalent (CET) of 0.24 [-] 80 mm thick plate
- Carbon equivalent (CET) of 0.26 [-] max.
Carbon equivalent (CEV) Carbon equivalent (CEV) of 0.36 [-] 50 mm thick plate
- Carbon equivalent (CEV) of 0.37 [-] 80 mm thick plate
- Carbon equivalent (CEV) of 0.39 [-] max.

EN 10028-5 Grade P420MHTL2 chemical

Property Value Comment
Aluminium Aluminium of 0.02 % min.
Carbon Carbon of 0.1 % max.
Manganese Manganese of 1.4 % max.
Molybdenum Molybdenum of 0.5 % max.
Niobium Niobium of 0.05 % max.
Nitrogen Nitrogen of 0.02 % max.
Phosphorus Phosphorus of 0.02 % max.
Silicon Silicon of 0.35 % max.
Sulfur Sulfur of 0.01 % max.
Vanadium Vanadium of 0.12 % max.

EN 10028-5 Grade P420MHTL2 mechanical

Property Temperature Value Comment
Charpy impact energy, V-notch -20 °C Charpy impact energy, V-notch of 60 J min., average
Charpy impact energy, V-notch, transverse -20 °C Charpy impact energy, V-notch, transverse of 40 J min., average
Creep strength 10^4 cycles 400 °C Creep strength 10^4 cycles of 380 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles
- 410 °C Creep strength 10^4 cycles of 360 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles
- 420 °C Creep strength 10^4 cycles of 355 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles
- 430 °C Creep strength 10^4 cycles of 339 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles
- 440 °C Creep strength 10^4 cycles of 323 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles
- 450 °C Creep strength 10^4 cycles of 305 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles
- 460 °C Creep strength 10^4 cycles of 287 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles
- 470 °C Creep strength 10^4 cycles of 267 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles
- 480 °C Creep strength 10^4 cycles of 247 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles
- 490 °C Creep strength 10^4 cycles of 226 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles
- 500 °C Creep strength 10^4 cycles of 204 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles
- 510 °C Creep strength 10^4 cycles of 180 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles
- 520 °C Creep strength 10^4 cycles of 156 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles
- 530 °C Creep strength 10^4 cycles of 131 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles
- 540 °C Creep strength 10^4 cycles of 105 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles
- 550 °C Creep strength 10^4 cycles of 78 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^4 cycles
Creep strength 10^5 cycles 400 °C Creep strength 10^5 cycles of 330 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^5 cycles
- 410 °C Creep strength 10^5 cycles of 312 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^5 cycles
- 420 °C Creep strength 10^5 cycles of 293 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^5 cycles
- 430 °C Creep strength 10^5 cycles of 274 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^5 cycles
- 440 °C Creep strength 10^5 cycles of 253 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^5 cycles
- 450 °C Creep strength 10^5 cycles of 231 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^5 cycles
- 460 °C Creep strength 10^5 cycles of 208 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^5 cycles
- 470 °C Creep strength 10^5 cycles of 184 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^5 cycles
- 480 °C Creep strength 10^5 cycles of 159 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^5 cycles
- 490 °C Creep strength 10^5 cycles of 133 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^5 cycles
- 500 °C Creep strength 10^5 cycles of 106 MPa 1% creep strain, Larson Miller method, up to 33 000 hours, 10^5 cycles
Tensile strength 23 °C Tensile strength of 500 - 660 MPa transverse test speciemen, thickness ≤ 100mm
- 100 °C Tensile strength of 310 - 335 MPa transverse test speciemen, thickness ≤ 100mm
- 200 °C Tensile strength of 310 - 335 MPa transverse test speciemen, thickness ≤ 100mm
- 300 °C Tensile strength of 275 - 295 MPa transverse test speciemen, thickness ≤ 100mm
- 400 °C Tensile strength of 250 - 275 MPa transverse test speciemen, thickness ≤ 100mm
- 500 °C Tensile strength of 235 - 250 MPa transverse test speciemen, thickness ≤ 100mm
Yield strength - Yield strength of 390 - 420 MPa ReH, min. values depending on the thickness, If not apparent, the yield strength Rp0.2 is measured

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