EN 1.8527 (8CrMo16-5) Nitriding Steel
EN 1.8527 steel is an alloy steel formulated for primary forming into wrought products. Cited properties are appropriate for the quenched and tempered condition. 1.8527 is the EN numeric designation for this material. 8CrMo16-5 is the EN chemical designation.
It has a fairly high electrical conductivity among EN wrought alloy steels. In addition, it has a fairly high base cost and a moderately low thermal conductivity.
The graph bars on the material properties cards below compare EN 1.8527 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
270
Elastic (Young's, Tensile) Modulus
190 GPa 28 x 106 psi
Elongation at Break
16 %
Fatigue Strength
520 MPa 76 x 103 psi
Impact Strength: V-Notched Charpy
39 J 29 ft-lb
Poisson's Ratio
0.29
Shear Modulus
74 GPa 11 x 106 psi
Shear Strength
550 MPa 80 x 103 psi
Tensile Strength: Ultimate (UTS)
900 MPa 130 x 103 psi
Tensile Strength: Yield (Proof)
800 MPa 120 x 103 psi
Thermal Properties
Latent Heat of Fusion
260 J/g
Maximum Temperature: Mechanical
490 °C 910 °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
41 W/m-K 24 BTU/h-ft-°F
Thermal Expansion
13 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
7.8 % IACS
Electrical Conductivity: Equal Weight (Specific)
9.0 % IACS
Otherwise Unclassified Properties
Base Metal Price
4.0 % relative
Density
7.8 g/cm3 490 lb/ft3
Embodied Carbon
1.7 kg CO2/kg material
Embodied Energy
23 MJ/kg 9.7 x 103 BTU/lb
Embodied Water
66 L/kg 7.8 gal/lb
Common Calculations
PREN (Pitting Resistance)
5.7
Resilience: Ultimate (Unit Rupture Work)
140 MJ/m3
Resilience: Unit (Modulus of Resilience)
1670 kJ/m3
Stiffness to Weight: Axial
14 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
32 points
Strength to Weight: Bending
26 points
Thermal Diffusivity
11 mm2/s
Thermal Shock Resistance
26 points
Alloy Composition
Among alloy steels, the composition of EN 1.8527 steel is notable for containing comparatively high amounts of manganese (Mn) and chromium (Cr). Manganese is used to improve hardenability, hot workability, and surface quality. There is some loss of ductility and weldability, however. Chromium is used to improve corrosion resistance and most mechanical properties (particularly at higher temperatures).
| Fe | 93.2 to 95.1 | |
| Cr | 3.7 to 4.3 | |
| Mn | 0.85 to 1.2 | |
| Mo | 0.4 to 0.6 | |
| Si | 0 to 0.4 | |
| Cu | 0 to 0.25 | |
| C | 0.040 to 0.12 | |
| S | 0 to 0.035 | |
| P | 0 to 0.025 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ISO 683-5: Heat treatable steels, alloy steels and free-cutting steels - Part 5: Nitriding steels
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