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EN 1.7338 (10CrMo5-5) Chromium-Molybdenum Steel

EN 1.7338 steel is an alloy steel formulated for primary forming into wrought products. Cited properties are appropriate for the normalized and tempered condition. 1.7338 is the EN numeric designation for this material. 10CrMo5-5 is the EN chemical designation.

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

The graph bars on the material properties cards below compare EN 1.7338 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

150

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

23 %

Fatigue Strength

220 MPa 31 x 103 psi

Impact Strength: V-Notched Charpy

38 J 28 ft-lb

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

310 MPa 45 x 103 psi

Tensile Strength: Ultimate (UTS)

490 MPa 70 x 103 psi

Tensile Strength: Yield (Proof)

300 MPa 44 x 103 psi

Thermal Properties

Latent Heat of Fusion

260 J/g

Maximum Temperature: Mechanical

430 °C 810 °F

Melting Completion (Liquidus)

1460 °C 2660 °F

Melting Onset (Solidus)

1420 °C 2580 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

40 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)

8.6 % IACS

Otherwise Unclassified Properties

Base Metal Price

3.1 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

1.6 kg CO2/kg material

Embodied Energy

21 MJ/kg 9.2 x 103 BTU/lb

Embodied Water

53 L/kg 6.4 gal/lb

Common Calculations

PREN (Pitting Resistance)

3.1

Resilience: Ultimate (Unit Rupture Work)

97 MJ/m3

Resilience: Unit (Modulus of Resilience)

240 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

17 points

Strength to Weight: Bending

18 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

14 points

Alloy Composition

Among alloy steels, the composition of EN 1.7338 steel is notable for including aluminum (Al) and copper (Cu). Aluminum is used to control grain size and to deoxidize. Deoxidizing is required to control the effects of some other alloying elements. Copper is used to improve corrosion resistance, and to add at least some degree of precipitation hardenability.

Iron (Fe) 95.4 to 97.8
Chromium (Cr) 1.0 to 1.5
Silicon (Si) 0.5 to 1.0
Molybdenum (Mo) 0.45 to 0.65
Manganese (Mn) 0.3 to 0.6
Nickel (Ni) 0 to 0.3
Copper (Cu) 0 to 0.3
Carbon (C) 0 to 0.15
Aluminum (Al) 0 to 0.040
Phosphorus (P) 0 to 0.025
Sulfur (S) 0 to 0.010

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

EN 10216-2: Seamless steel tubes for pressure purposes - Technical delivery conditions - Part 2: Non-alloy and alloy steel tubes with specified elevated temperature properties

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

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

Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011

Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005

Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015

Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015