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.
| Fe | 96.4 to 98.7 | |
| Mn | 0.9 to 1.5 | |
| Mo | 0.45 to 0.6 | |
| Si | 0 to 0.4 | |
| Cr | 0 to 0.3 | |
| Ni | 0 to 0.3 | |
| Cu | 0 to 0.3 | |
| C | 0 to 0.2 | |
| P | 0 to 0.015 | |
| N | 0 to 0.012 | |
| 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