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EN 1.7386 (X11CrMo9-1) High-Chromium Steel

EN 1.7386 steel is an alloy steel formulated for primary forming into wrought products. 1.7386 is the EN numeric designation for this material. X11CrMo9-1 is the EN chemical designation.

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

The properties of EN 1.7386 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 1.7386 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

170 to 200

Elastic (Young's, Tensile) Modulus

190 GPa 28 x 106 psi

Elongation at Break

18 to 21 %

Fatigue Strength

170 to 290 MPa 24 to 43 x 103 psi

Impact Strength: V-Notched Charpy

38 J 28 ft-lb

Poisson's Ratio

0.28

Shear Modulus

75 GPa 11 x 106 psi

Shear Strength

340 to 410 MPa 50 to 60 x 103 psi

Tensile Strength: Ultimate (UTS)

550 to 670 MPa 80 to 96 x 103 psi

Tensile Strength: Yield (Proof)

240 to 440 MPa 35 to 63 x 103 psi

Thermal Properties

Latent Heat of Fusion

270 J/g

Maximum Temperature: Mechanical

600 °C 1110 °F

Melting Completion (Liquidus)

1450 °C 2650 °F

Melting Onset (Solidus)

1410 °C 2570 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

26 W/m-K 15 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

9.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

10 % IACS

Otherwise Unclassified Properties

Base Metal Price

6.5 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

2.0 kg CO2/kg material

Embodied Energy

28 MJ/kg 12 x 103 BTU/lb

Embodied Water

88 L/kg 10 gal/lb

Common Calculations

PREN (Pitting Resistance)

12

Resilience: Ultimate (Unit Rupture Work)

92 to 110 MJ/m3

Resilience: Unit (Modulus of Resilience)

150 to 490 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

20 to 24 points

Strength to Weight: Bending

19 to 22 points

Thermal Diffusivity

6.9 mm2/s

Thermal Shock Resistance

15 to 18 points

Alloy Composition

Among alloy steels, the composition of EN 1.7386 steel is notable for containing a comparatively high amount of chromium (Cr) and including aluminum (Al). Chromium is used to improve corrosion resistance and most mechanical properties (particularly at higher temperatures). Aluminum is used to control grain size and to deoxidize. Deoxidizing is required to control the effects of some other alloying elements.

Iron (Fe) 86.8 to 90.5
Chromium (Cr) 8.0 to 10
Molybdenum (Mo) 0.9 to 1.1
Silicon (Si) 0.25 to 1.0
Manganese (Mn) 0.3 to 0.6
Copper (Cu) 0 to 0.3
Carbon (C) 0.080 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 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

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