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EN 1.7703 (13CrMoV9-10) Chromium-Molybdenum Steel

EN 1.7703 steel is an alloy steel formulated for primary forming into wrought products. 1.7703 is the EN numeric designation for this material. 13CrMoV9-10 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 fairly low thermal conductivity.

The properties of EN 1.7703 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 1.7703 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

200 to 210

Elastic (Young's, Tensile) Modulus

190 GPa 28 x 106 psi

Elongation at Break

20 %

Fatigue Strength

320 to 340 MPa 47 to 50 x 103 psi

Impact Strength: V-Notched Charpy

46 J 34 ft-lb

Poisson's Ratio

0.29

Shear Modulus

74 GPa 11 x 106 psi

Shear Strength

420 to 430 MPa 61 to 62 x 103 psi

Tensile Strength: Ultimate (UTS)

670 to 690 MPa 97 to 99 x 103 psi

Tensile Strength: Yield (Proof)

460 to 500 MPa 67 to 72 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

460 °C 860 °F

Melting Completion (Liquidus)

1470 °C 2680 °F

Melting Onset (Solidus)

1430 °C 2610 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

39 W/m-K 23 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.6 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.7 % IACS

Otherwise Unclassified Properties

Base Metal Price

4.2 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

2.5 kg CO2/kg material

Embodied Energy

35 MJ/kg 15 x 103 BTU/lb

Embodied Water

61 L/kg 7.2 gal/lb

Common Calculations

PREN (Pitting Resistance)

5.6

Resilience: Ultimate (Unit Rupture Work)

120 to 130 MJ/m3

Resilience: Unit (Modulus of Resilience)

570 to 650 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

24 points

Strength to Weight: Bending

22 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

19 to 20 points

Alloy Composition

Among alloy steels, the composition of EN 1.7703 steel is notable for including niobium (Nb) and titanium (Ti). Niobium is primarily used to improve yield strength. Titanium is used to broadly improve mechanical properties.

Iron (Fe) 94.6 to 96.4
Chromium (Cr) 2.0 to 2.5
Molybdenum (Mo) 0.9 to 1.1
Manganese (Mn) 0.3 to 0.6
Vanadium (V) 0.25 to 0.35
Carbon (C) 0.11 to 0.15
Nickel (Ni) 0 to 0.25
Copper (Cu) 0 to 0.2
Silicon (Si) 0 to 0.1
Niobium (Nb) 0 to 0.070
Titanium (Ti) 0 to 0.030
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

Welding Metallurgy, 2nd ed., Sindo Kou, 2003

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