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Core Hardened (+CH) 1.7108 Steel

EN 1.7108 +CH steel is EN 1.7108 steel in the core hardened (CH) condition. It has the second highest strength compared to the other variants of EN 1.7108 steel. The graph bars on the material properties cards below compare EN 1.7108 +CH 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

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Poisson's Ratio

0.29

Rockwell C Hardness

56

Shear Modulus

72 GPa 10 x 106 psi

Tensile Strength: Ultimate (UTS)

1800 MPa 260 x 103 psi

Thermal Properties

Latent Heat of Fusion

280 J/g

Maximum Temperature: Mechanical

410 °C 760 °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

46 W/m-K 27 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.4 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.7 % IACS

Otherwise Unclassified Properties

Base Metal Price

2.1 % relative

Density

7.7 g/cm3 480 lb/ft3

Embodied Carbon

1.5 kg CO2/kg material

Embodied Energy

20 MJ/kg 8.5 x 103 BTU/lb

Embodied Water

47 L/kg 5.6 gal/lb

Common Calculations

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

65 points

Strength to Weight: Bending

43 points

Thermal Diffusivity

12 mm2/s

Thermal Shock Resistance

54 points

Alloy Composition

Iron (Fe)Fe 95.9 to 96.9
Silicon (Si)Si 1.6 to 2.0
Manganese (Mn)Mn 0.7 to 1.0
Carbon (C)C 0.57 to 0.65
Chromium (Cr)Cr 0.2 to 0.45
Phosphorus (P)P 0 to 0.025
Sulfur (S)S 0 to 0.025

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

Followup Questions

Further Reading

EN 10089: Hot rolled steels for quenched and tempered springs - Technical delivery conditions

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