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EN 1.8958 (S235J0W) Weathering Steel

EN 1.8958 steel is an alloy steel formulated for primary forming into wrought products. Cited properties are appropriate for the hot worked condition. 1.8958 is the EN numeric designation for this material. S235J0W is the EN chemical designation.

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

The graph bars on the material properties cards below compare EN 1.8958 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

130

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

19 %

Fatigue Strength

150 MPa 22 x 103 psi

Impact Strength: V-Notched Charpy

30 J 22 ft-lb

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

270 MPa 39 x 103 psi

Tensile Strength: Ultimate (UTS)

430 MPa 62 x 103 psi

Tensile Strength: Yield (Proof)

220 MPa 32 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

410 °C 780 °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

46 W/m-K 26 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.3 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.4 % IACS

Otherwise Unclassified Properties

Base Metal Price

2.4 % relative

Density

7.9 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

50 L/kg 5.9 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

70 MJ/m3

Resilience: Unit (Modulus of Resilience)

130 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

15 points

Strength to Weight: Bending

16 points

Thermal Diffusivity

12 mm2/s

Thermal Shock Resistance

13 points

Alloy Composition

Among alloy steels, the composition of EN 1.8958 steel is notable for including nitrogen (N). Nitrogen has a substantial strengthening effect, but may contribute to strain aging unless the steel is deoxidized with aluminum.

Iron (Fe) 96.5 to 99.3
Chromium (Cr) 0.35 to 0.85
Manganese (Mn) 0.15 to 0.7
Copper (Cu) 0.2 to 0.6
Nickel (Ni) 0 to 0.7
Silicon (Si) 0 to 0.45
Carbon (C) 0 to 0.16
Phosphorus (P) 0 to 0.040
Sulfur (S) 0 to 0.040
Nitrogen (N) 0 to 0.010

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

Followup Questions

Similar Alloys

Further Reading

EN 10025-5: Hot rolled products of structural steels - Part 5: Technical delivery conditions for structural steels with improved atmospheric corrosion resistance

Real Material Properties of Weathering Steels Used in Bridge Structures, Vit Krivy and Petr Konecny, 2013

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

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

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