EN 1.1133 (20Mn5) Non-Alloy Steel
EN 1.1133 steel is a carbon (non-alloy) steel formulated for primary forming into wrought products. 1.1133 is the EN numeric designation for this material. 20Mn5 is the EN chemical designation.
It has a moderately high electrical conductivity and a moderately low thermal conductivity among wrought carbon or non-alloy steels.
The properties of EN 1.1133 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 1.1133 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
170 to 180
Elastic (Young's, Tensile) Modulus
190 GPa 27 x 106 psi
Elongation at Break
19 to 24 %
Fatigue Strength
230 to 310 MPa 33 to 45 x 103 psi
Impact Strength: V-Notched Charpy
45 to 48 J 33 to 35 ft-lb
Poisson's Ratio
0.29
Shear Modulus
73 GPa 11 x 106 psi
Shear Strength
370 to 380 MPa 54 to 56 x 103 psi
Tensile Strength: Ultimate (UTS)
580 to 620 MPa 84 to 89 x 103 psi
Tensile Strength: Yield (Proof)
320 to 460 MPa 46 to 66 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 29 BTU/h-ft-°F
Thermal Expansion
12 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
7.3 % 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
1.5 kg CO2/kg material
Embodied Energy
19 MJ/kg 8.2 x 103 BTU/lb
Embodied Water
48 L/kg 5.8 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
110 to 120 MJ/m3
Resilience: Unit (Modulus of Resilience)
270 to 550 kJ/m3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
21 to 22 points
Strength to Weight: Bending
20 to 21 points
Thermal Diffusivity
13 mm2/s
Thermal Shock Resistance
18 to 19 points
Alloy Composition
| Fe | 96.9 to 98.8 | |
| Mn | 1.0 to 1.5 | |
| C | 0.17 to 0.23 | |
| Si | 0 to 0.4 | |
| Cr | 0 to 0.4 | |
| Ni | 0 to 0.4 | |
| Mo | 0 to 0.1 | |
| P | 0 to 0.035 | |
| 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 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
Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015
Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015