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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

Iron (Fe) 97.6 to 99.38
Manganese (Mn) 0.4 to 0.7
Carbon (C) 0.22 to 0.29
Silicon (Si) 0 to 0.4
Chromium (Cr) 0 to 0.4
Nickel (Ni) 0 to 0.4
Molybdenum (Mo) 0 to 0.1
Phosphorus (P) 0 to 0.035
Sulfur (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