Core Hardened (+CH) 1.7106 Steel
EN 1.7106 +CH steel is EN 1.7106 steel in the core hardened (CH) condition. It has the second highest strength compared to the other variants of EN 1.7106 steel. The graph bars on the material properties cards below compare EN 1.7106 +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
54
Shear Modulus
72 GPa 10 x 106 psi
Tensile Strength: Ultimate (UTS)
1750 MPa 250 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)
8.6 % 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
63 points
Strength to Weight: Bending
42 points
Thermal Diffusivity
13 mm2/s
Thermal Shock Resistance
53 points
Alloy Composition
| Fe | 95.9 to 97 | |
| Si | 1.6 to 2.0 | |
| Mn | 0.7 to 1.0 | |
| C | 0.52 to 0.6 | |
| Cr | 0.2 to 0.45 | |
| P | 0 to 0.025 | |
| 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