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EN 1.5502 (17B2) Boron Steel

EN 1.5502 steel is an alloy steel formulated for primary forming into wrought products. 1.5502 is the EN numeric designation for this material. 17B2 is the EN chemical designation.

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

The properties of EN 1.5502 steel include five 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 1.5502 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

120 to 160

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

12 to 20 %

Fatigue Strength

190 to 290 MPa 27 to 42 x 103 psi

Poisson's Ratio

0.29

Reduction in Area

62 to 76 %

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

280 to 330 MPa 41 to 48 x 103 psi

Tensile Strength: Ultimate (UTS)

400 to 1380 MPa 57 to 200 x 103 psi

Tensile Strength: Yield (Proof)

270 to 440 MPa 39 to 64 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

400 °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

52 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

1.9 % 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

47 L/kg 5.6 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

41 to 210 MJ/m3

Resilience: Unit (Modulus of Resilience)

200 to 520 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

14 to 49 points

Strength to Weight: Bending

15 to 35 points

Thermal Diffusivity

14 mm2/s

Thermal Shock Resistance

12 to 40 points

Alloy Composition

Among alloy steels, the composition of EN 1.5502 steel is notable for including boron (B). Boron is used to improve hardenability. It has a substantial effect when added in even tiny amounts.

Iron (Fe) 98 to 99.249
Manganese (Mn) 0.6 to 0.9
Carbon (C) 0.15 to 0.2
Silicon (Si) 0 to 0.3
Chromium (Cr) 0 to 0.3
Copper (Cu) 0 to 0.25
Phosphorus (P) 0 to 0.025
Sulfur (S) 0 to 0.025
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

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

EN 10263-4: Steel rod, bars and wire for cold heading and cold extrusion - Part 4: Technical delivery conditions for steels for quenching and tempering

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