EN 1.5507 (23MnB3) Boron Steel
Alloy Steels
quenched and tempered
Property Overview
Density7.8g/cm³
Elastic Modulus190GPa
Tensile Strength880MPa
Yield Strength730MPa
Brinell Hardness260HB
Maximum Service Temperature410°C
Chemical Composition
C
0.21 to 0.25%
CR
0.25 to 0.35%
MN
0.8 to 1.0%
SI
0 to 0.15%
P
0 to 0.015%
S
0 to 0.015%
CU
0 to 0.25%
TI
0 to 0.060%
AL
0.020 to 0.080%
B
0.00080 to 0.0050%
FE
97.8 to 98.7%
Mechanical
Elastic (Young's, Tensile) Modulus
190 GPa
Elongation at Break
16 %
Fatigue Strength
480 MPa
Impact Strength: V-Notched Charpy
46 J
Poisson's Ratio
0.29
Reduction in Area
58 %
Shear Modulus
73 GPa
Shear Strength
540 MPa
Tensile Strength: Ultimate (UTS)
880 MPa
Tensile Strength: Yield (Proof)
730 MPa
Hardness
Brinell Hardness
260
Physical
Density
7.8 g/cm 3
Thermal
Latent Heat of Fusion
250 J/g
Maximum Temperature: Mechanical
410 °C
Melting Completion (Liquidus)
1460 °C
Melting Onset (Solidus)
1420 °C
Specific Heat Capacity
470 J/kg-K
Thermal Conductivity
49 W/m-K
Thermal Diffusivity
13 mm 2 /s
Thermal Expansion
13 µm/m-K
Thermal Shock Resistance
26 points
Electrical
Electrical Conductivity: Equal Volume
7.1 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.2 % IACS
Calculated
Resilience: Ultimate (Unit Rupture Work)
130 MJ/m 3
Resilience: Unit (Modulus of Resilience)
1420 kJ/m 3
Stiffness to Weight: Axial
13 points
Stiffness to Weight: Bending
24 points
Strength to Weight: Axial
31 points
Strength to Weight: Bending
26 points
Environmental
Base Metal Price
2.0 % relative
Embodied Carbon
1.4 kg CO 2 /kg material
Embodied Energy
19 MJ/kg
Embodied Energy
19 MJ/kg 8.1 x 10 3 BTU/lb
Embodied Water
49 L/kg
Embodied Water
49 L/kg 5.8 gal/lb
Registered Designations & Aliases
1.550723MnB3EN 1.5507 (23MnB3) Boron Steel
Standards
EN 10269 EN 10269: Steels and nickel alloys for fasteners with specified elevated and/or low temperature properties
EN 10269 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