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EN 1.7711 (40CrMoV4-6) Chromium-Molybdenum Steel

EN 1.7711 steel is an alloy steel formulated for primary forming into wrought products. 1.7711 is the EN numeric designation for this material. 40CrMoV4-6 is the EN chemical designation.

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

The properties of EN 1.7711 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 1.7711 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

210 to 280

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

16 to 22 %

Fatigue Strength

290 to 520 MPa 42 to 76 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

440 to 570 MPa 63 to 82 x 103 psi

Tensile Strength: Ultimate (UTS)

690 to 930 MPa 100 to 130 x 103 psi

Tensile Strength: Yield (Proof)

400 to 800 MPa 59 to 120 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

430 °C 800 °F

Melting Completion (Liquidus)

1460 °C 2670 °F

Melting Onset (Solidus)

1420 °C 2590 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

33 W/m-K 19 BTU/h-ft-°F

Thermal Expansion

11 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.4 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.5 % IACS

Otherwise Unclassified Properties

Base Metal Price

3.0 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

2.3 kg CO2/kg material

Embodied Energy

32 MJ/kg 14 x 103 BTU/lb

Embodied Water

54 L/kg 6.4 gal/lb

Common Calculations

PREN (Pitting Resistance)

2.9

Resilience: Ultimate (Unit Rupture Work)

130 to 140 MJ/m3

Resilience: Unit (Modulus of Resilience)

430 to 1690 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

24 to 33 points

Strength to Weight: Bending

22 to 27 points

Thermal Diffusivity

8.9 mm2/s

Thermal Shock Resistance

24 to 32 points

Alloy Composition

Among alloy steels, the composition of EN 1.7711 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 to 97.5
Chromium (Cr) 0.9 to 1.2
Manganese (Mn) 0.45 to 0.85
Molybdenum (Mo) 0.5 to 0.65
Carbon (C) 0.36 to 0.44
Vanadium (V) 0.25 to 0.35
Silicon (Si) 0 to 0.4
Sulfur (S) 0 to 0.030
Phosphorus (P) 0 to 0.025
Aluminum (Al) 0 to 0.015

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

Followup Questions

Similar Alloys

Further Reading

EN 10269: Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties

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

Microstructure of Steels and Cast Irons, Madeleine Durand-Charre, 2004

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