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15NiCuMoNb5 | 1.6368 Material Datasheet

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Material Description

Material Number Material Number (single) Standard Scope Standard Status Country Predecessor Application temperature [°C] VDA 231-106 classification
1.6368 (VdTÜV WB 377-3 : 2025-01) 1.6368 VdTÜV WB 377-3 : 2025-01 Supersedes VdTÜV WB 377-3 : 2024-05 Valid Germany 15NiCuMoNb5 -10 - 500 1.1 1)
1) Remark: Weldable high-temperature structural steel for forgings for pressure vessels according to AD 2000 W9, W12, W13 from -10 to 500 °C, for pressure equipment according to directive 2014/68/EU and for nuclear engineering.

Chemical Composition

Al [%] C [%] Cr [%] Cu [%] Mn [%] Mo [%] N [%] Nb [%] Ni [%] P [%] S [%] Si [%]
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Mechanical Properties

Semi-finished Product Condition Nominal Size [mm] Temperature [°C] Specimen Direction Tensile Strength [MPa] Yield Strength [MPa] Yield Strength (0.2% offset) [MPa] Elongation A [%]
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Physical Properties

Temperature [°C] Density [g/cm³] Young's Modulus [GPa] Mean Coefficient of Thermal Expansion (reference 20°C) [10^-6*K^-1] Differential Coefficient of Thermal Expansion [10^-6*K^-1] Thermal Conductivity [W/(m*K)] Thermal Diffusivity [10^-6 m²/s] Specific Electrical Resistance [µΩm] Mean Specific Heat Capacity [kJ/(kg*K)] True Specific Heat Capacity [kJ/(kg*K)]
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Welding and Joining

Procedure Welding and Joining - Evaluation Nominal Size [mm] Preheating [°C] Cooling Time t8/5 [s] Holding Temperature [°C] Interpass Temperature [°C]
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Toughness Data (Impact)

Semi-finished Product Condition Nominal Size [mm] Temperature [°C] Specimen Shape Specimen Direction Notch Impact Energy [J]
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Creep Rupture Behaviour

Semi-finished Product Condition Temperature [°C] Creep Tensile Strength at 10^4 h [MPa] Creep Tensile Strength at 10^5 h [MPa] 1% Creep Limit at 10^4 h [MPa] 1% Creep Limit at 10^5 h [MPa]
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Heat Treatment

Heat Treatment Step Nominal Size [mm] Temperature [°C] Holding Time [h] Medium
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Cross Reference

Material Name Country Standard
15NiCuMoNb5-6-4 Europe 1)
A508 Grade 2 USA ASTM A508 1)
K12766 USA UNS 1)
1.6368 Germany VdTÜV WB 377/3
15 NiCuMoNb 5 Germany
1) Source: Stahlschlüssel 2019, Verlag Stahlschlüssel Wegst GmbH, Marbach