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EN 1.7380 (10CrMo9-10) Chromium-Molybdenum Steel

EN 1.7380 steel is an alloy steel formulated for primary forming into wrought products. 1.7380 is the EN numeric designation for this material. 10CrMo9-10 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 1.7380 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 1.7380 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 to 170

Elastic (Young's, Tensile) Modulus

190 GPa 28 x 106 psi

Elongation at Break

19 to 20 %

Fatigue Strength

200 to 230 MPa 29 to 33 x 103 psi

Impact Strength: V-Notched Charpy

31 to 35 J 23 to 26 ft-lb

Poisson's Ratio

0.29

Shear Modulus

74 GPa 11 x 106 psi

Shear Strength

330 to 350 MPa 48 to 50 x 103 psi

Tensile Strength: Ultimate (UTS)

540 to 550 MPa 78 to 80 x 103 psi

Tensile Strength: Yield (Proof)

290 to 330 MPa 43 to 47 x 103 psi

Thermal Properties

Latent Heat of Fusion

260 J/g

Maximum Temperature: Mechanical

460 °C 860 °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

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

3.8 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

1.8 kg CO2/kg material

Embodied Energy

23 MJ/kg 9.9 x 103 BTU/lb

Embodied Water

59 L/kg 7.0 gal/lb

Common Calculations

PREN (Pitting Resistance)

5.6

Resilience: Ultimate (Unit Rupture Work)

87 to 98 MJ/m3

Resilience: Unit (Modulus of Resilience)

230 to 280 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 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

15 to 16 points

Alloy Composition

Among alloy steels, the composition of EN 1.7380 steel is notable for including nitrogen (N) and containing a comparatively high amount of chromium (Cr). Nitrogen has a substantial strengthening effect, but may contribute to strain aging unless the steel is deoxidized with aluminum. Chromium is used to improve corrosion resistance and most mechanical properties (particularly at higher temperatures).

Iron (Fe) 94.6 to 96.6
Chromium (Cr) 2.0 to 2.5
Molybdenum (Mo) 0.9 to 1.1
Manganese (Mn) 0.4 to 0.8
Silicon (Si) 0 to 0.5
Copper (Cu) 0 to 0.3
Carbon (C) 0.080 to 0.14
Phosphorus (P) 0 to 0.020
Nitrogen (N) 0 to 0.012
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 10028-2: Flat products made of steels for pressure purposes - Part 2: Non-alloy and alloy 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

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