EN 1.3539 (100CrMnMoSi8-4-6) Through-Hardening Bearing Steel
EN 1.3539 steel is an alloy steel formulated for primary forming into wrought products. Cited properties are appropriate for the spheroidized condition. 1.3539 is the EN numeric designation for this material. 100CrMnMoSi8-4-6 is the EN chemical designation.
It has a fairly low thermal conductivity among EN wrought alloy steels. In addition, it has a moderately low melting temperature and a moderately high base cost.
The graph bars on the material properties cards below compare EN 1.3539 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
200
Elastic (Young's, Tensile) Modulus
190 GPa 27 x 106 psi
Poisson's Ratio
0.29
Shear Modulus
73 GPa 11 x 106 psi
Tensile Strength: Ultimate (UTS)
670 MPa 97 x 103 psi
Thermal Properties
Latent Heat of Fusion
260 J/g
Maximum Temperature: Mechanical
450 °C 840 °F
Melting Completion (Liquidus)
1450 °C 2640 °F
Melting Onset (Solidus)
1410 °C 2560 °F
Specific Heat Capacity
470 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
39 W/m-K 23 BTU/h-ft-°F
Thermal Expansion
13 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
7.5 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.7 % IACS
Otherwise Unclassified Properties
Base Metal Price
3.2 % relative
Density
7.8 g/cm3 490 lb/ft3
Embodied Carbon
1.7 kg CO2/kg material
Embodied Energy
22 MJ/kg 9.5 x 103 BTU/lb
Embodied Water
57 L/kg 6.8 gal/lb
Common Calculations
PREN (Pitting Resistance)
3.8
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
25 points
Strength to Weight: Axial
24 points
Strength to Weight: Bending
22 points
Thermal Diffusivity
11 mm2/s
Thermal Shock Resistance
20 points
Alloy Composition
Among alloy steels, the composition of EN 1.3539 steel is notable for containing a comparatively high amount of carbon (C). Carbon is used to increase strength at the cost of a decrease in formability.
| Fe | 95.2 to 96.5 | |
| Cr | 1.8 to 2.1 | |
| C | 0.93 to 1.1 | |
| Mn | 0.8 to 1.1 | |
| Mo | 0.5 to 0.6 | |
| Si | 0.4 to 0.6 | |
| Cu | 0 to 0.3 | |
| Al | 0 to 0.050 | |
| S | 0 to 0.030 | |
| P | 0 to 0.025 | |
| O | 0 to 0.0015 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
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