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EN 1.5507 (23MnB3) Boron Steel

EN 1.5507 steel is an alloy steel formulated for primary forming into wrought products. 1.5507 is the EN numeric designation for this material. 23MnB3 is the EN chemical designation.

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

The properties of EN 1.5507 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 1.5507 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

140 to 260

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Poisson's Ratio

0.29

Reduction in Area

58 to 72 %

Shear Modulus

73 GPa 11 x 106 psi

Tensile Strength: Ultimate (UTS)

450 to 880 MPa 65 to 130 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 2590 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

49 W/m-K 28 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.1 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.2 % IACS

Otherwise Unclassified Properties

Base Metal Price

2.0 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

1.4 kg CO2/kg material

Embodied Energy

19 MJ/kg 8.1 x 103 BTU/lb

Embodied Water

49 L/kg 5.8 gal/lb

Common Calculations

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

16 to 31 points

Strength to Weight: Bending

17 to 26 points

Thermal Diffusivity

13 mm2/s

Thermal Shock Resistance

13 to 26 points

Alloy Composition

Among alloy steels, the composition of EN 1.5507 steel is notable for including boron (B) and titanium (Ti). Boron is used to improve hardenability. It has a substantial effect when added in even tiny amounts. Titanium is used to broadly improve mechanical properties.

Iron (Fe) 97.8 to 98.7
Manganese (Mn) 0.8 to 1.0
Chromium (Cr) 0.25 to 0.35
Carbon (C) 0.21 to 0.25
Copper (Cu) 0 to 0.25
Silicon (Si) 0 to 0.15
Aluminum (Al) 0.020 to 0.080
Titanium (Ti) 0 to 0.060
Phosphorus (P) 0 to 0.015
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