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EN 1.8522 (33CrMoV12-9) High-Temperature Bearing Steel

EN 1.8522 steel is an alloy steel formulated for primary forming into wrought products. 1.8522 is the EN numeric designation for this material. 33CrMoV12-9 is the EN chemical designation.

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

The properties of EN 1.8522 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 1.8522 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

220 to 380

Elastic (Young's, Tensile) Modulus

190 GPa 28 x 106 psi

Poisson's Ratio

0.29

Shear Modulus

74 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

730 to 1250 MPa 110 to 180 x 103 psi

Thermal Properties

Latent Heat of Fusion

260 J/g

Maximum Temperature: Mechanical

470 °C 890 °F

Melting Completion (Liquidus)

1460 °C 2670 °F

Melting Onset (Solidus)

1420 °C 2590 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

39 W/m-K 22 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.8 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.9 % IACS

Otherwise Unclassified Properties

Base Metal Price

4.2 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

2.2 kg CO2/kg material

Embodied Energy

31 MJ/kg 13 x 103 BTU/lb

Embodied Water

63 L/kg 7.5 gal/lb

Common Calculations

PREN (Pitting Resistance)

6.2

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

26 to 44 points

Strength to Weight: Bending

23 to 33 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

21 to 36 points

Alloy Composition

Among alloy steels, the composition of EN 1.8522 steel is notable for containing a comparatively high amount of chromium (Cr) and including vanadium (V). Chromium is used to improve corrosion resistance and most mechanical properties (particularly at higher temperatures). Vanadium has a strong hardening effect, but this effect is particularly sensitive to the type of tempering.

Iron (Fe) 93.7 to 96
Chromium (Cr) 2.8 to 3.3
Molybdenum (Mo) 0.7 to 1.2
Manganese (Mn) 0.4 to 0.7
Carbon (C) 0.29 to 0.36
Silicon (Si) 0 to 0.4
Vanadium (V) 0.15 to 0.25
Nickel (Ni) 0 to 0.3
Copper (Cu) 0 to 0.1
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

ISO 683-17: Heat-treated steels, alloy steels and free-cutting steels - Part 17: Ball and roller bearing 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