EN 1.7715 (14MoV6-3) Molybdenum-Vanadium Steel
EN 1.7715 steel is an alloy steel formulated for primary forming into wrought products. Cited properties are appropriate for the normalized and tempered condition. 1.7715 is the EN numeric designation for this material. 14MoV6-3 is the EN chemical designation.
It has a moderately high density among EN wrought alloy steels. In addition, it has a very high melting temperature and a very high embodied energy.
The graph bars on the material properties cards below compare EN 1.7715 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
160
Elastic (Young's, Tensile) Modulus
190 GPa 27 x 106 psi
Elongation at Break
21 %
Fatigue Strength
240 MPa 35 x 103 psi
Impact Strength: V-Notched Charpy
34 J 25 ft-lb
Poisson's Ratio
0.29
Shear Modulus
73 GPa 11 x 106 psi
Shear Strength
340 MPa 49 x 103 psi
Tensile Strength: Ultimate (UTS)
540 MPa 78 x 103 psi
Tensile Strength: Yield (Proof)
340 MPa 50 x 103 psi
Thermal Properties
Latent Heat of Fusion
250 J/g
Maximum Temperature: Mechanical
420 °C 780 °F
Melting Completion (Liquidus)
1470 °C 2670 °F
Melting Onset (Solidus)
1430 °C 2600 °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
7.3 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.4 % IACS
Otherwise Unclassified Properties
Base Metal Price
2.9 % relative
Density
7.9 g/cm3 490 lb/ft3
Embodied Carbon
2.2 kg CO2/kg material
Embodied Energy
30 MJ/kg 13 x 103 BTU/lb
Embodied Water
52 L/kg 6.2 gal/lb
Common Calculations
PREN (Pitting Resistance)
2.4
Resilience: Ultimate (Unit Rupture Work)
99 MJ/m3
Resilience: Unit (Modulus of Resilience)
320 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
19 points
Strength to Weight: Bending
19 points
Thermal Diffusivity
11 mm2/s
Thermal Shock Resistance
16 points
Alloy Composition
Among alloy steels, the composition of EN 1.7715 steel is notable for including aluminum (Al) and vanadium (V). Aluminum is used to control grain size and to deoxidize. Deoxidizing is required to control the effects of some other alloying elements. Vanadium has a strong hardening effect, but this effect is particularly sensitive to the type of tempering.
| Fe | 96.5 to 98.3 | |
| Mo | 0.5 to 0.7 | |
| Mn | 0.4 to 0.7 | |
| Cr | 0.3 to 0.6 | |
| Si | 0.15 to 0.35 | |
| V | 0.22 to 0.28 | |
| Ni | 0 to 0.3 | |
| Cu | 0 to 0.3 | |
| C | 0.1 to 0.15 | |
| Al | 0 to 0.040 | |
| P | 0 to 0.025 | |
| S | 0 to 0.010 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
EN 10222-2: Steel forgings for pressure purposes - Part 2: Ferritic and martensitic 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
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015
Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015