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EN 1.5511 (35B2) Boron Steel

EN 1.5511 steel is an alloy steel formulated for primary forming into wrought products. 1.5511 is the EN numeric designation for this material. 35B2 is the EN chemical designation.

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

The properties of EN 1.5511 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 1.5511 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

150 to 170

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Poisson's Ratio

0.29

Reduction in Area

51 to 69 %

Shear Modulus

72 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

490 to 580 MPa 71 to 83 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 2580 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

51 W/m-K 30 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.1 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.1 % IACS

Otherwise Unclassified Properties

Base Metal Price

1.8 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

1.4 kg CO2/kg material

Embodied Energy

19 MJ/kg 8.0 x 103 BTU/lb

Embodied Water

46 L/kg 5.5 gal/lb

Common Calculations

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

17 to 20 points

Strength to Weight: Bending

18 to 20 points

Thermal Diffusivity

14 mm2/s

Thermal Shock Resistance

15 to 17 points

Alloy Composition

Among alloy steels, the composition of EN 1.5511 steel is notable for including boron (B) and aluminum (Al). Boron is used to improve hardenability. It has a substantial effect when added in even tiny amounts. Aluminum is used to control grain size and to deoxidize. Deoxidizing is required to control the effects of some other alloying elements.

Iron (Fe) 98.3 to 99.159
Manganese (Mn) 0.5 to 0.8
Carbon (C) 0.32 to 0.39
Silicon (Si) 0 to 0.4
Aluminum (Al) 0.020 to 0.060
Phosphorus (P) 0 to 0.030
Sulfur (S) 0 to 0.015
Boron (B) 0.00080 to 0.0050

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

Followup Questions

Similar Alloys

Further Reading

EN 10269: Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties

Boron in Steel, S. K. Banerji and J. E. Morral (editors), 1980

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