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EN 1.7106 (56SiCr7) Silicon-Chromium Steel

EN 1.7106 steel is an alloy steel formulated for primary forming into wrought products. 1.7106 is the EN numeric designation for this material. 56SiCr7 is the EN chemical designation.

It has a very low melting temperature among EN wrought alloy steels. In addition, it has a very low density and a fairly low base cost.

The properties of EN 1.7106 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 1.7106 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

200 to 500

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)

660 to 2020 MPa 95 to 290 x 103 psi

Thermal Properties

Latent Heat of Fusion

280 J/g

Maximum Temperature: Mechanical

410 °C 760 °F

Melting Completion (Liquidus)

1430 °C 2610 °F

Melting Onset (Solidus)

1390 °C 2540 °F

Specific Heat Capacity

480 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

46 W/m-K 27 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.4 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.6 % IACS

Otherwise Unclassified Properties

Base Metal Price

2.1 % relative

Density

7.7 g/cm3 480 lb/ft3

Embodied Carbon

1.5 kg CO2/kg material

Embodied Energy

20 MJ/kg 8.5 x 103 BTU/lb

Embodied Water

47 L/kg 5.6 gal/lb

Common Calculations

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

25 points

Strength to Weight: Axial

24 to 73 points

Strength to Weight: Bending

22 to 46 points

Thermal Diffusivity

13 mm2/s

Thermal Shock Resistance

20 to 61 points

Alloy Composition

Among alloy steels, the composition of EN 1.7106 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) 95.9 to 97
Silicon (Si) 1.6 to 2.0
Manganese (Mn) 0.7 to 1.0
Carbon (C) 0.52 to 0.6
Chromium (Cr) 0.2 to 0.45
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