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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


Elastic (Young's, Tensile) Modulus

210 GPa 30 x 106 psi

Poisson's Ratio


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


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)


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).

Iron (Fe)Fe 73.7 to 77.6
Tungsten (W)W 17.5 to 19
Chromium (Cr)Cr 3.9 to 4.3
Vanadium (V)V 1.0 to 1.3
Carbon (C)C 0.7 to 0.8
Molybdenum (Mo)Mo 0 to 0.6
Manganese (Mn)Mn 0 to 0.4
Silicon (Si)Si 0 to 0.4
Copper (Cu)Cu 0 to 0.3
Phosphorus (P)P 0 to 0.025
Sulfur (S)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