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EN 1.5023 (38Si7) Silicon Steel

EN 1.5023 steel is an alloy steel formulated for primary forming into wrought products. 1.5023 is the EN numeric designation for this material. 38Si7 is the EN chemical designation.

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

The properties of EN 1.5023 steel include six 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 1.5023 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

170 to 440

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Poisson's Ratio

0.29

Shear Modulus

72 GPa 10 x 106 psi

Tensile Strength: Ultimate (UTS)

570 to 1860 MPa 83 to 270 x 103 psi

Thermal Properties

Latent Heat of Fusion

270 J/g

Maximum Temperature: Mechanical

400 °C 750 °F

Melting Completion (Liquidus)

1440 °C 2620 °F

Melting Onset (Solidus)

1400 °C 2550 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

48 W/m-K 28 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

1.9 % relative

Density

7.7 g/cm3 480 lb/ft3

Embodied Carbon

1.4 kg CO2/kg material

Embodied Energy

19 MJ/kg 8.3 x 103 BTU/lb

Embodied Water

45 L/kg 5.4 gal/lb

Common Calculations

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

21 to 67 points

Strength to Weight: Bending

20 to 43 points

Thermal Diffusivity

13 mm2/s

Thermal Shock Resistance

17 to 56 points

Alloy Composition

Among alloy steels, the composition of EN 1.5023 steel is notable for containing a comparatively high amount of silicon (Si). Silicon content is typically governed by metallurgical processing concerns, and not its effects on final material properties. However, it does have a modest strengthening effect.

Iron (Fe) 96.9 to 97.7
Silicon (Si) 1.5 to 1.8
Manganese (Mn) 0.5 to 0.8
Carbon (C) 0.35 to 0.42
Phosphorus (P) 0 to 0.025
Sulfur (S) 0 to 0.025

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

Followup Questions

Similar Alloys

Further Reading

EN 10089: Hot rolled steels for quenched and tempered springs - Technical delivery conditions

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