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).
| Fe | 91.9 to 95.3 | |
| Cr | 4.0 to 6.0 | |
| Mn | 0.3 to 0.8 | |
| Mo | 0.45 to 0.65 | |
| Si | 0 to 0.4 | |
| C | 0 to 0.18 | |
| P | 0 to 0.025 | |
| 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