EN 1.1158 (C25E) Non-Alloy Steel
EN 1.1158 steel is a carbon (non-alloy) steel formulated for primary forming into wrought products. 1.1158 is the EN numeric designation for this material. C25E is the EN chemical designation. It has a moderately low thermal conductivity among the wrought carbon or non-alloy steels in the database.
The properties of EN 1.1158 steel include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare EN 1.1158 steel to: wrought carbon or non-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
140 to 150
Elastic (Young's, Tensile) Modulus
190 GPa 27 x 106 psi
Elongation at Break
23 to 24 %
Fatigue Strength
170 to 220 MPa 25 to 32 x 103 psi
Impact Strength: V-Notched Charpy
28 to 40 J 21 to 29 ft-lb
Poisson's Ratio
0.29
Shear Modulus
73 GPa 11 x 106 psi
Shear Strength
300 to 320 MPa 43 to 47 x 103 psi
Tensile Strength: Ultimate (UTS)
470 to 500 MPa 68 to 73 x 103 psi
Tensile Strength: Yield (Proof)
240 to 310 MPa 35 to 45 x 103 psi
Thermal Properties
Latent Heat of Fusion
250 J/g
Maximum Temperature: Mechanical
400 °C 750 °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
49 W/m-K 28 BTU/h-ft-°F
Thermal Expansion
12 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
7.2 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.2 % IACS
Otherwise Unclassified Properties
Base Metal Price
2.1 % relative
Density
7.8 g/cm3 490 lb/ft3
Embodied Carbon
1.4 kg CO2/kg material
Embodied Energy
19 MJ/kg 8.1 x 103 BTU/lb
Embodied Water
47 L/kg 5.6 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
89 to 110 MJ/m3
Resilience: Unit (Modulus of Resilience)
150 to 250 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
17 to 18 points
Strength to Weight: Bending
17 to 18 points
Thermal Diffusivity
13 mm2/s
Thermal Shock Resistance
15 to 16 points
Alloy Composition
| Fe | 97.6 to 99.38 | |
| Mn | 0.4 to 0.7 | |
| C | 0.22 to 0.29 | |
| Si | 0 to 0.4 | |
| Cr | 0 to 0.4 | |
| Ni | 0 to 0.4 | |
| Mo | 0 to 0.1 | |
| P | 0 to 0.035 | |
| S | 0 to 0.035 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
EN 10250-2: Open die steel forgings for general engineering purposes - Part 2: Non-alloy quality and special steels
Carbon Steel Handbook, D. Gandy, 2007
Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008
Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015