EN 1.3558 (X75WCrV18-4-1) High-Temperature Bearing Steel
EN 1.3558 steel is an alloy steel formulated for primary forming into wrought products. Cited properties are appropriate for the spheroidized condition. 1.3558 is the EN numeric designation for this material. X75WCrV18-4-1 is the EN chemical designation.
It has the highest base cost among EN wrought alloy steels. In addition, it has the highest electrical conductivity and the lowest thermal conductivity.
The graph bars on the material properties cards below compare EN 1.3558 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
230
Elastic (Young's, Tensile) Modulus
210 GPa 30 x 106 psi
Poisson's Ratio
0.29
Shear Modulus
80 GPa 12 x 106 psi
Tensile Strength: Ultimate (UTS)
770 MPa 110 x 103 psi
Thermal Properties
Latent Heat of Fusion
240 J/g
Maximum Temperature: Mechanical
490 °C 910 °F
Melting Completion (Liquidus)
1810 °C 3290 °F
Melting Onset (Solidus)
1760 °C 3190 °F
Specific Heat Capacity
410 J/kg-K 0.1 BTU/lb-°F
Thermal Conductivity
20 W/m-K 12 BTU/h-ft-°F
Thermal Expansion
12 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
13 % IACS
Electrical Conductivity: Equal Weight (Specific)
12 % IACS
Otherwise Unclassified Properties
Base Metal Price
45 % relative
Density
9.3 g/cm3 580 lb/ft3
Embodied Carbon
8.4 kg CO2/kg material
Embodied Energy
130 MJ/kg 55 x 103 BTU/lb
Embodied Water
90 L/kg 11 gal/lb
Common Calculations
PREN (Pitting Resistance)
35
Stiffness to Weight: Axial
12 points
Stiffness to Weight: Bending
21 points
Strength to Weight: Axial
23 points
Strength to Weight: Bending
20 points
Thermal Diffusivity
5.3 mm2/s
Thermal Shock Resistance
22 points
Alloy Composition
Among alloy steels, the composition of EN 1.3558 steel is notable for including tungsten (W) and containing a comparatively high amount of chromium (Cr). Tungsten interacts with other alloying elements to a greater extent than usual, which makes it hard to broadly characterize its effects. Chromium is used to improve corrosion resistance and most mechanical properties (particularly at higher temperatures).
| Fe | 73.7 to 77.6 | |
| W | 17.5 to 19 | |
| Cr | 3.9 to 4.3 | |
| V | 1.0 to 1.3 | |
| C | 0.7 to 0.8 | |
| Mo | 0 to 0.6 | |
| Mn | 0 to 0.4 | |
| Si | 0 to 0.4 | |
| Cu | 0 to 0.3 | |
| 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
ISO 683-17: Heat-treated steels, alloy steels and free-cutting steels - Part 17: Ball and roller bearing steels
Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015