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EN 1.3549 (X89CrMoV18-1) Stainless Bearing Steel

EN 1.3549 stainless steel is a martensitic stainless steel formulated for primary forming into wrought products. Cited properties are appropriate for the spheroidized condition. 1.3549 is the EN numeric designation for this material. X89CrMoV18-1 is the EN chemical designation.

It has a moderately low electrical conductivity among wrought martensitic stainless steels. In addition, it has a moderately high base cost and a moderately low thermal conductivity.

The graph bars on the material properties cards below compare EN 1.3549 stainless steel to: wrought martensitic stainless 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

Elastic (Young's, Tensile) Modulus

200 GPa 29 x 106 psi

Poisson's Ratio

0.28

Shear Modulus

77 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

730 MPa 110 x 103 psi

Thermal Properties

Latent Heat of Fusion

280 J/g

Maximum Temperature: Corrosion

400 °C 750 °F

Maximum Temperature: Mechanical

910 °C 1660 °F

Melting Completion (Liquidus)

1430 °C 2610 °F

Melting Onset (Solidus)

1390 °C 2540 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

21 W/m-K 12 BTU/h-ft-°F

Thermal Expansion

10 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

2.3 % IACS

Electrical Conductivity: Equal Weight (Specific)

2.7 % IACS

Otherwise Unclassified Properties

Base Metal Price

10 % relative

Density

7.7 g/cm3 480 lb/ft3

Embodied Carbon

2.6 kg CO2/kg material

Embodied Energy

37 MJ/kg 16 x 103 BTU/lb

Embodied Water

130 L/kg 15 gal/lb

Common Calculations

PREN (Pitting Resistance)

22

Stiffness to Weight: Axial

14 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

27 points

Strength to Weight: Bending

24 points

Thermal Diffusivity

5.6 mm2/s

Thermal Shock Resistance

26 points

Alloy Composition

Among wrought stainless steels, the composition of EN 1.3549 stainless steel is notable for including vanadium (V). Vanadium has a strong hardening effect, but this effect is particularly sensitive to the type of tempering.

Iron (Fe) 77.5 to 82
Chromium (Cr) 17 to 19
Molybdenum (Mo) 0.9 to 1.3
Carbon (C) 0.85 to 1.0
Manganese (Mn) 0 to 1.0
Silicon (Si) 0 to 1.0
Vanadium (V) 0.070 to 0.12
Phosphorus (P) 0 to 0.040
Sulfur (S) 0 to 0.030

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

Corrosion of Stainless Steels, A. John Sedriks, 1996