MakeItFrom.com
Menu (ESC)

EN 1.7390 (X15CrMo5-1) High-Chromium Steel

EN 1.7390 steel is an alloy steel formulated for primary forming into wrought products. Cited properties are appropriate for the normalized and tempered condition. 1.7390 is the EN numeric designation for this material. X15CrMo5-1 is the EN chemical designation.

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

The graph bars on the material properties cards below compare EN 1.7390 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

Elastic (Young's, Tensile) Modulus

190 GPa 28 x 106 psi

Elongation at Break

16 %

Fatigue Strength

310 MPa 46 x 103 psi

Impact Strength: V-Notched Charpy

46 J 34 ft-lb

Poisson's Ratio

0.29

Reduction in Area

50 %

Shear Modulus

74 GPa 11 x 106 psi

Shear Strength

440 MPa 63 x 103 psi

Tensile Strength: Ultimate (UTS)

710 MPa 100 x 103 psi

Tensile Strength: Yield (Proof)

480 MPa 69 x 103 psi

Thermal Properties

Latent Heat of Fusion

260 J/g

Maximum Temperature: Mechanical

510 °C 950 °F

Melting Completion (Liquidus)

1460 °C 2660 °F

Melting Onset (Solidus)

1420 °C 2590 °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

8.1 % IACS

Electrical Conductivity: Equal Weight (Specific)

9.3 % IACS

Otherwise Unclassified Properties

Base Metal Price

4.3 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

1.7 kg CO2/kg material

Embodied Energy

23 MJ/kg 10 x 103 BTU/lb

Embodied Water

69 L/kg 8.2 gal/lb

Common Calculations

PREN (Pitting Resistance)

6.8

Resilience: Ultimate (Unit Rupture Work)

100 MJ/m3

Resilience: Unit (Modulus of Resilience)

600 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

25 points

Strength to Weight: Bending

23 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

20 points

Alloy Composition

Among alloy steels, the composition of EN 1.7390 steel is notable for containing a comparatively high amount of chromium (Cr). Chromium is used to improve corrosion resistance and most mechanical properties (particularly at higher temperatures).

Iron (Fe) 91.9 to 95.3
Chromium (Cr) 4.0 to 6.0
Manganese (Mn) 0.3 to 0.8
Molybdenum (Mo) 0.45 to 0.65
Silicon (Si) 0 to 0.4
Carbon (C) 0 to 0.18
Phosphorus (P) 0 to 0.025
Sulfur (S) 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