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EN 1.7233 (42CrMo5-6) Chromium-Molybdenum Steel

EN 1.7233 steel is an alloy steel formulated for primary forming into wrought products. 1.7233 is the EN numeric designation for this material. 42CrMo5-6 is the EN chemical designation.

It has a fairly low thermal conductivity among EN wrought alloy steels. In addition, it has a moderately high base cost and can have a moderately high tensile strength.

The properties of EN 1.7233 steel include three common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare EN 1.7233 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

210 to 290

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

18 to 23 %

Fatigue Strength

270 to 530 MPa 39 to 77 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

450 to 590 MPa 65 to 86 x 103 psi

Tensile Strength: Ultimate (UTS)

700 to 960 MPa 100 to 140 x 103 psi

Tensile Strength: Yield (Proof)

380 to 780 MPa 55 to 110 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

430 °C 810 °F

Melting Completion (Liquidus)

1460 °C 2660 °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

7.4 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.5 % IACS

Otherwise Unclassified Properties

Base Metal Price

3.0 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

1.6 kg CO2/kg material

Embodied Energy

21 MJ/kg 9.1 x 103 BTU/lb

Embodied Water

53 L/kg 6.3 gal/lb

Common Calculations

PREN (Pitting Resistance)

3.3

Resilience: Ultimate (Unit Rupture Work)

110 to 200 MJ/m3

Resilience: Unit (Modulus of Resilience)

380 to 1630 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

25 to 34 points

Strength to Weight: Bending

22 to 28 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

21 to 28 points

Alloy Composition

Among alloy steels, the composition of EN 1.7233 steel is notable for containing a comparatively high amount of chromium (Cr). Chromium is used to improve corrosion resistance and most mechanical properties (particularly at higher temperatures).

Iron (Fe) 96.2 to 97.5
Chromium (Cr) 1.2 to 1.5
Molybdenum (Mo) 0.5 to 0.7
Manganese (Mn) 0.4 to 0.7
Carbon (C) 0.39 to 0.45
Silicon (Si) 0 to 0.4
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

EN 10269: Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties

Creep-Resistant Steels, Fujio Abe et al. (editors), 2008

Microstructure of Steels and Cast Irons, Madeleine Durand-Charre, 2004

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