MakeItFrom.com
Menu (ESC)

SAE-AISI 51B60 (G51601) Boron Steel

SAE-AISI 51B60 steel is an alloy steel formulated for primary forming into wrought products. 51B60 is the designation in both the SAE and AISI systems for this material. G51601 is the UNS number.

The properties of SAE-AISI 51B60 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 SAE-AISI 51B60 steel to: SAE-AISI wrought 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

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

12 to 21 %

Fatigue Strength

280 to 340 MPa 40 to 50 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

390 to 420 MPa 57 to 60 x 103 psi

Tensile Strength: Ultimate (UTS)

660 MPa 95 to 96 x 103 psi

Tensile Strength: Yield (Proof)

400 to 550 MPa 58 to 80 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

420 °C 780 °F

Melting Completion (Liquidus)

1450 °C 2650 °F

Melting Onset (Solidus)

1410 °C 2570 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

43 W/m-K 25 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.2 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.3 % IACS

Otherwise Unclassified Properties

Base Metal Price

2.1 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

1.4 kg CO2/kg material

Embodied Energy

19 MJ/kg 8.3 x 103 BTU/lb

Embodied Water

49 L/kg 5.9 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

73 to 120 MJ/m3

Resilience: Unit (Modulus of Resilience)

420 to 800 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

23 points

Strength to Weight: Bending

22 points

Thermal Diffusivity

12 mm2/s

Thermal Shock Resistance

19 points

Alloy Composition

Among alloy steels, the composition of SAE-AISI 51B60 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) 97 to 97.8
Manganese (Mn) 0.75 to 1.0
Chromium (Cr) 0.7 to 0.9
Carbon (C) 0.56 to 0.64
Silicon (Si) 0.15 to 0.35
Sulfur (S) 0 to 0.040
Phosphorus (P) 0 to 0.035
Boron (B) 0.00050 to 0.0030

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

Followup Questions

Similar Alloys

Further Reading

ASTM A752: Standard Specification for General Requirements for Wire Rods and Coarse Round Wire, Alloy Steel

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

ASTM A29: Standard Specification for Steel Bars, Carbon and Alloy, Hot-Wrought, General Requirements for

ASM Specialty Handbook: Carbon and Alloy Steels, J. R. Davis (editor), 1996

Manufacture and Uses of Alloy Steels, Henry D. Hibbard, 2005

Steels: Processing, Structure, and Performance, 2nd ed., George Krauss, 2015