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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.

Iron (Fe) 96.5 to 98.3
Molybdenum (Mo) 0.5 to 0.7
Manganese (Mn) 0.4 to 0.7
Chromium (Cr) 0.3 to 0.6
Silicon (Si) 0.15 to 0.35
Vanadium (V) 0.22 to 0.28
Nickel (Ni) 0 to 0.3
Copper (Cu) 0 to 0.3
Carbon (C) 0.1 to 0.15
Aluminum (Al) 0 to 0.040
Phosphorus (P) 0 to 0.025
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 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