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EN 1.6368 (15NiCuMoNb5-6-4) Nickel Steel

EN 1.6368 steel is an alloy steel formulated for primary forming into wrought products. 1.6368 is the EN numeric designation for this material. 15NiCuMoNb5-6-4 is the EN chemical designation.

It has a moderately high density among EN wrought alloy steels. In addition, it has a moderately low thermal conductivity and a moderately high base cost.

The properties of EN 1.6368 steel include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare EN 1.6368 steel to: EN wrought alloy steels (top), all iron alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Brinell Hardness

200 to 210

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

18 %

Fatigue Strength

310 to 330 MPa 45 to 48 x 103 psi

Impact Strength: V-Notched Charpy

43 to 46 J 32 to 34 ft-lb

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

410 to 430 MPa 59 to 62 x 103 psi

Tensile Strength: Ultimate (UTS)

660 to 690 MPa 96 to 99 x 103 psi

Tensile Strength: Yield (Proof)

460 to 490 MPa 67 to 71 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

410 °C 770 °F

Melting Completion (Liquidus)

1460 °C 2660 °F

Melting Onset (Solidus)

1420 °C 2580 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

40 W/m-K 23 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.5 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.6 % IACS

Otherwise Unclassified Properties

Base Metal Price

3.4 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

1.7 kg CO2/kg material

Embodied Energy

22 MJ/kg 9.4 x 103 BTU/lb

Embodied Water

53 L/kg 6.3 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

110 MJ/m3

Resilience: Unit (Modulus of Resilience)

580 to 650 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

23 to 24 points

Strength to Weight: Bending

21 to 22 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

20 points

Alloy Composition

Among alloy steels, the composition of EN 1.6368 steel is notable for including niobium (Nb) and nitrogen (N). Niobium is primarily used to improve yield strength. Nitrogen has a substantial strengthening effect, but may contribute to strain aging unless the steel is deoxidized with aluminum.

Iron (Fe) 95.1 to 97.2
Nickel (Ni) 1.0 to 1.3
Manganese (Mn) 0.8 to 1.2
Copper (Cu) 0.5 to 0.8
Silicon (Si) 0.25 to 0.5
Molybdenum (Mo) 0.25 to 0.5
Chromium (Cr) 0 to 0.3
Carbon (C) 0 to 0.17
Niobium (Nb) 0.015 to 0.045
Aluminum (Al) 0.015 to 0.040
Phosphorus (P) 0 to 0.025
Nitrogen (N) 0 to 0.020
Sulfur (S) 0 to 0.010

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

EN 10028-2: Flat products made of steels for pressure purposes - Part 2: Non-alloy and alloy steels with specified elevated temperature properties

EN 10216-2: Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties

Creep-Resistant Steels, Fujio Abe et al. (editors), 2008

Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011

ASM Specialty Handbook: Carbon and Alloy Steels, J. R. Davis (editor), 1996

Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005

Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008

Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015