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Quenched and Tempered 4150 Cr-Mo Steel

Quenched and tempered SAE-AISI 4150 is SAE-AISI 4150 steel in the quenched and tempered condition. It has the highest strength compared to the other variants of SAE-AISI 4150 steel. The graph bars on the material properties cards below compare quenched and tempered SAE-AISI 4150 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

380

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

14 %

Fatigue Strength

780 MPa 110 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

800 MPa 120 x 103 psi

Tensile Strength: Ultimate (UTS)

1310 MPa 190 x 103 psi

Tensile Strength: Yield (Proof)

1220 MPa 180 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

420 °C 790 °F

Melting Completion (Liquidus)

1460 °C 2650 °F

Melting Onset (Solidus)

1420 °C 2580 °F

Specific Heat Capacity

470 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

42 W/m-K 24 BTU/h-ft-°F

Thermal Expansion

13 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

7.3 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.4 % IACS

Otherwise Unclassified Properties

Base Metal Price

2.4 % relative

Density

7.8 g/cm3 490 lb/ft3

Embodied Carbon

1.5 kg CO2/kg material

Embodied Energy

20 MJ/kg 8.6 x 103 BTU/lb

Embodied Water

51 L/kg 6.1 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

180 MJ/m3

Resilience: Unit (Modulus of Resilience)

3930 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

47 points

Strength to Weight: Bending

34 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

39 points

Alloy Composition

Iron (Fe)Fe 96.7 to 97.7
Chromium (Cr)Cr 0.8 to 1.1
Manganese (Mn)Mn 0.75 to 1.0
Carbon (C)C 0.48 to 0.53
Silicon (Si)Si 0.15 to 0.35
Molybdenum (Mo)Mo 0.15 to 0.25
Sulfur (S)S 0 to 0.040
Phosphorus (P)P 0 to 0.035

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

Followup Questions

Further Reading

ASTM A322: Standard Specification for Steel Bars, Alloy, Standard Grades

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