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
| Fe | 99.335 to 99.71 | |
| Mn | 0.25 to 0.4 | |
| Si | 0 to 0.1 | |
| C | 0.020 to 0.060 | |
| Al | 0.020 to 0.060 | |
| S | 0 to 0.025 | |
| 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