Core Hardened (+CH) 1.7225 Steel
EN 1.7225 +CH steel is EN 1.7225 steel in the core hardened (CH) condition. It has the second highest strength compared to the other variants of EN 1.7225 steel. The graph bars on the material properties cards below compare EN 1.7225 +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
50
Shear Modulus
73 GPa 11 x 106 psi
Tensile Strength: Ultimate (UTS)
1620 MPa 230 x 103 psi
Thermal Properties
Latent Heat of Fusion
250 J/g
Maximum Temperature: Mechanical
420 °C 800 °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
46 W/m-K 27 BTU/h-ft-°F
Thermal Expansion
13 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
7.3 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.4 % IACS
Otherwise Unclassified Properties
Base Metal Price
2.5 % relative
Density
7.8 g/cm3 490 lb/ft3
Embodied Carbon
1.5 kg CO2/kg material
Embodied Energy
20 MJ/kg 8.6 x 103 BTU/lb
Embodied Water
51 L/kg 6.1 gal/lb
Common Calculations
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
57 points
Strength to Weight: Bending
39 points
Thermal Diffusivity
12 mm2/s
Thermal Shock Resistance
48 points
Alloy Composition
| Fe | 96.6 to 98 | |
| Cr | 0.9 to 1.2 | |
| Mn | 0.6 to 0.9 | |
| C | 0.38 to 0.45 | |
| Mo | 0.15 to 0.3 | |
| Si | 0 to 0.4 | |
| Cu | 0 to 0.25 | |
| P | 0 to 0.035 | |
| S | 0 to 0.035 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Further Reading
EN 10250-3: Open die steel forgings for general engineering purposes - Part 3: Alloy special steels
EN 10269: Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties
EN 10263-4: Steel rod, bars and wire for cold heading and cold extrusion - Part 4: Technical delivery conditions for steels for quenching and tempering
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