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EN 1.7366 (X16CrMo5-1) High-Chromium Steel

EN 1.7366 steel is an alloy steel formulated for primary forming into wrought products. 1.7366 is the EN numeric designation for this material. X16CrMo5-1 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 properties of EN 1.7366 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 1.7366 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

140 to 210

Elastic (Young's, Tensile) Modulus

190 GPa 28 x 106 psi

Elongation at Break

17 to 19 %

Fatigue Strength

160 to 320 MPa 23 to 46 x 103 psi

Impact Strength: V-Notched Charpy

38 J 28 ft-lb

Poisson's Ratio

0.29

Shear Modulus

74 GPa 11 x 106 psi

Shear Strength

290 to 440 MPa 42 to 63 x 103 psi

Tensile Strength: Ultimate (UTS)

460 to 710 MPa 67 to 100 x 103 psi

Tensile Strength: Yield (Proof)

230 to 480 MPa 34 to 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)

74 to 110 MJ/m3

Resilience: Unit (Modulus of Resilience)

140 to 600 kJ/m3

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

16 to 25 points

Strength to Weight: Bending

17 to 23 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

13 to 20 points

Alloy Composition

Among alloy steels, the composition of EN 1.7366 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 10222-2: Steel forgings for pressure purposes - Part 2: Ferritic and martensitic steels with specified elevated temperature properties

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

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

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