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EN 1.1203 (C55E) Non-Alloy Steel

EN 1.1203 steel is a carbon (non-alloy) steel formulated for primary forming into wrought products. 1.1203 is the EN numeric designation for this material. C55E is the EN chemical designation.

It has a moderately low thermal conductivity among wrought carbon or non-alloy steels. In addition, it can have a moderately high tensile strength and a moderately low ductility.

The properties of EN 1.1203 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 1.1203 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

200 to 230

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

12 to 15 %

Fatigue Strength

210 to 310 MPa 31 to 45 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

72 GPa 11 x 106 psi

Shear Strength

420 to 480 MPa 60 to 69 x 103 psi

Tensile Strength: Ultimate (UTS)

690 to 780 MPa 100 to 110 x 103 psi

Tensile Strength: Yield (Proof)

340 to 480 MPa 50 to 69 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

400 °C 750 °F

Melting Completion (Liquidus)

1460 °C 2650 °F

Melting Onset (Solidus)

1420 °C 2580 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

48 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)

8.3 % 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 8.2 x 103 BTU/lb

Embodied Water

47 L/kg 5.6 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

69 to 100 MJ/m3

Resilience: Unit (Modulus of Resilience)

310 to 610 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

25 to 28 points

Strength to Weight: Bending

22 to 24 points

Thermal Diffusivity

13 mm2/s

Thermal Shock Resistance

22 to 25 points

Alloy Composition

Iron (Fe) 97.1 to 98.9
Manganese (Mn) 0.6 to 0.9
Carbon (C) 0.52 to 0.6
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

Microstructure of Steels and Cast Irons, Madeleine Durand-Charre, 2004

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