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SAE-AISI 4150 (1.7228, 50CrMo4, G41500) Cr-Mo Steel

SAE-AISI 4150 steel is an alloy steel formulated for primary forming into wrought products. 4150 is the designation in both the SAE and AISI systems for this material. 1.7228 is the EN numeric designation. And G41500 is the UNS number.

The properties of SAE-AISI 4150 steel include three common variations. The property values on this page show 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 SAE-AISI 4150 steel to: wrought alloy steels (top), all iron alloys (middle), and the entire database (bottom). The length of each bar shows the given value as a % of the largest value in the relevant set.

Mechanical Properties

Brinell Hardness

200 to 380

Elastic (Young's, Tensile) Modulus

190 GPa 27 x 106 psi

Elongation at Break

12 to 20 %

Fatigue Strength

260 to 780 MPa 38 to 110 x 103 psi

Poisson's Ratio

0.29

Shear Modulus

73 GPa 11 x 106 psi

Shear Strength

460 to 800 MPa 66 to 120 x 103 psi

Tensile Strength: Ultimate (UTS)

730 to 1310 MPa 110 to 190 x 103 psi

Tensile Strength: Yield (Proof)

380 to 1220 MPa 55 to 180 x 103 psi

Thermal Properties

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

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)

120 to 180 MJ/m3

Resilience: Unit (Modulus of Resilience)

380 to 3930 kJ/m3

Stiffness to Weight: Axial

13 points

Stiffness to Weight: Bending

24 points

Strength to Weight: Axial

26 to 47 points

Strength to Weight: Bending

23 to 34 points

Thermal Diffusivity

11 m2/s

Thermal Shock Resistance

21 to 39 points

Alloy Composition

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

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

Followup Questions

Similar Alloys

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