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EN 1.5414 (18MnMo4-5) Molybdenum Steel

EN 1.5414 steel is an alloy steel formulated for primary forming into wrought products. 1.5414 is the EN numeric designation for this material. 18MnMo4-5 is the EN chemical designation. It has a moderately high density and can have a fairly low tensile strength among EN wrought alloy steels.

The properties of EN 1.5414 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 1.5414 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

170 to 180

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

22 %

Fatigue Strength

250 to 270 MPa 36 to 39 x 103 psi

Impact Strength: V-Notched Charpy

46 J 34 ft-lb

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

350 to 370 MPa 50 to 53 x 103 psi

Tensile Strength: Ultimate (UTS)

550 to 580 MPa 80 to 84 x 103 psi

Tensile Strength: Yield (Proof)

350 to 380 MPa 50 to 54 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

410 °C 770 °F

Melting Completion (Liquidus)

1470 °C 2670 °F

Melting Onset (Solidus)

1420 °C 2590 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

44 W/m-K 26 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.3 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.4 % IACS

Otherwise Unclassified Properties

Base Metal Price

2.6 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

1.6 kg CO2/kg material

Embodied Energy

21 MJ/kg 8.8 x 103 BTU/lb

Embodied Water

50 L/kg 6.0 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

110 MJ/m3

Resilience: Unit (Modulus of Resilience)

320 to 370 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

19 to 20 points

Strength to Weight: Bending

19 to 20 points

Thermal Diffusivity

12 mm2/s

Thermal Shock Resistance

16 to 17 points

Alloy Composition

Among alloy steels, the composition of EN 1.5414 steel is notable for containing a comparatively high amount of manganese (Mn) and including nitrogen (N). Manganese is used to improve hardenability, hot workability, and surface quality. There is some loss of ductility and weldability, however. Nitrogen has a substantial strengthening effect, but may contribute to strain aging unless the steel is deoxidized with aluminum.

Iron (Fe) 96.4 to 98.7
Manganese (Mn) 0.9 to 1.5
Molybdenum (Mo) 0.45 to 0.6
Silicon (Si) 0 to 0.4
Chromium (Cr) 0 to 0.3
Nickel (Ni) 0 to 0.3
Copper (Cu) 0 to 0.3
Carbon (C) 0 to 0.2
Phosphorus (P) 0 to 0.015
Nitrogen (N) 0 to 0.012
Sulfur (S) 0 to 0.0050

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

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

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

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