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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).

Iron (Fe) 93.2 to 95.1
Chromium (Cr) 3.7 to 4.3
Manganese (Mn) 0.85 to 1.2
Molybdenum (Mo) 0.4 to 0.6
Silicon (Si) 0 to 0.4
Copper (Cu) 0 to 0.25
Carbon (C) 0.040 to 0.12
Sulfur (S) 0 to 0.035
Phosphorus (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