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EN 1.8902 (S420N) Steel

EN 1.8902 steel is an alloy steel formulated for primary forming into wrought products. Cited properties are appropriate for the normalized condition. 1.8902 is the EN numeric designation for this material. S420N is the EN chemical designation.

It has a moderately high electrical conductivity among EN wrought alloy steels. In addition, it has a moderately high embodied energy and a moderately low tensile strength.

The graph bars on the material properties cards below compare EN 1.8902 steel to: EN wrought 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

180

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

21 %

Fatigue Strength

290 MPa 42 x 103 psi

Impact Strength: V-Notched Charpy

58 J 43 ft-lb

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

380 MPa 55 x 103 psi

Tensile Strength: Ultimate (UTS)

600 MPa 87 x 103 psi

Tensile Strength: Yield (Proof)

420 MPa 61 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

410 °C 760 °F

Melting Completion (Liquidus)

1460 °C 2660 °F

Melting Onset (Solidus)

1420 °C 2580 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

44 W/m-K 26 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.6 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.7 % IACS

Otherwise Unclassified Properties

Base Metal Price

2.6 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

1.8 kg CO2/kg material

Embodied Energy

24 MJ/kg 10 x 103 BTU/lb

Embodied Water

51 L/kg 6.0 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

110 MJ/m3

Resilience: Unit (Modulus of Resilience)

470 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

21 points

Strength to Weight: Bending

20 points

Thermal Diffusivity

12 mm2/s

Thermal Shock Resistance

18 points

Alloy Composition

Among alloy steels, the composition of EN 1.8902 steel is notable for containing a comparatively high amount of manganese (Mn) and including niobium (Nb). Manganese is used to improve hardenability, hot workability, and surface quality. There is some loss of ductility and weldability, however. Niobium is primarily used to improve yield strength.

Iron (Fe) 95 to 99.05
Manganese (Mn) 1.0 to 1.8
Nickel (Ni) 0 to 0.85
Silicon (Si) 0 to 0.65
Copper (Cu) 0 to 0.6
Chromium (Cr) 0 to 0.35
Carbon (C) 0 to 0.22
Vanadium (V) 0 to 0.22
Molybdenum (Mo) 0 to 0.13
Niobium (Nb) 0 to 0.060
Titanium (Ti) 0 to 0.060
Phosphorus (P) 0 to 0.035
Sulfur (S) 0 to 0.030
Nitrogen (N) 0 to 0.027
Aluminum (Al) 0 to 0.015

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

Followup Questions

Similar Alloys

Further Reading

EN 10025-3: Hot rolled products of structural steels - Part 3: Technical delivery conditions for normalized rolled weldable fine grain structural steels

Welding Metallurgy, 2nd ed., Sindo Kou, 2003

Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005

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

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