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EN 1.0303 (C4C) Non-Alloy Steel

EN 1.0303 steel is a carbon (non-alloy) steel formulated for primary forming into wrought products. 1.0303 is the EN numeric designation for this material. C4C is the EN chemical designation.

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

The properties of EN 1.0303 steel include four common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare EN 1.0303 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

84 to 120

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

12 to 25 %

Fatigue Strength

150 to 230 MPa 22 to 33 x 103 psi

Poisson's Ratio

0.29

Reduction in Area

75 to 86 %

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

220 to 260 MPa 31 to 38 x 103 psi

Tensile Strength: Ultimate (UTS)

290 to 410 MPa 42 to 60 x 103 psi

Tensile Strength: Yield (Proof)

200 to 320 MPa 30 to 47 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

400 °C 750 °F

Melting Completion (Liquidus)

1470 °C 2670 °F

Melting Onset (Solidus)

1430 °C 2600 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

53 W/m-K 31 BTU/h-ft-°F

Thermal Expansion

12 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

6.9 % IACS

Electrical Conductivity: Equal Weight (Specific)

7.9 % IACS

Otherwise Unclassified Properties

Base Metal Price

1.8 % relative

Density

7.9 g/cm3 490 lb/ft3

Embodied Carbon

1.4 kg CO2/kg material

Embodied Energy

18 MJ/kg 7.8 x 103 BTU/lb

Embodied Water

46 L/kg 5.4 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

30 to 94 MJ/m3

Resilience: Unit (Modulus of Resilience)

110 to 270 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

10 to 15 points

Strength to Weight: Bending

12 to 16 points

Thermal Diffusivity

14 mm2/s

Thermal Shock Resistance

9.2 to 13 points

Alloy Composition

Iron (Fe) 99.335 to 99.71
Manganese (Mn) 0.25 to 0.4
Silicon (Si) 0 to 0.1
Carbon (C) 0.020 to 0.060
Aluminum (Al) 0.020 to 0.060
Sulfur (S) 0 to 0.025
Phosphorus (P) 0 to 0.020

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

EN 10263-2: Steel rod, bars and wire for cold heading and cold extrusion - Part 2: Technical delivery conditions for steels not intended for heat treatment after cold working

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

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