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EN 1.1181 (C35E) Non-Alloy Steel

EN 1.1181 steel is a carbon (non-alloy) steel formulated for primary forming into wrought products. 1.1181 is the EN numeric designation for this material. C35E is the EN chemical designation. It has a very low thermal conductivity among the wrought carbon or non-alloy steels in the database.

The properties of EN 1.1181 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 1.1181 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

160 to 180

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

19 to 20 %

Fatigue Strength

190 to 260 MPa 28 to 38 x 103 psi

Impact Strength: V-Notched Charpy

23 to 38 J 17 to 28 ft-lb

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

350 to 390 MPa 51 to 56 x 103 psi

Tensile Strength: Ultimate (UTS)

560 to 620 MPa 81 to 89 x 103 psi

Tensile Strength: Yield (Proof)

280 to 380 MPa 41 to 55 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

42 W/m-K 24 BTU/h-ft-°F

Thermal Expansion

11 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)

90 to 110 MJ/m3

Resilience: Unit (Modulus of Resilience)

210 to 380 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

20 to 22 points

Strength to Weight: Bending

19 to 21 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

19 to 21 points

Alloy Composition

Iron (Fe) 97.4 to 99.18
Manganese (Mn) 0.5 to 0.8
Carbon (C) 0.32 to 0.39
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

EN 10297-1: Seamless circular steel tubes for mechanical and general engineering purposes - Technical delivery conditions - Part 1: Non-alloy and alloy steel tubes

EN 10269: Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties

Creep-Resistant Steels, Fujio Abe et al. (editors), 2008

Carbon Steel Handbook, D. Gandy, 2007

ASM Specialty Handbook: Carbon and Alloy Steels, J. R. Davis (editor), 1996

Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008

Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015