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

SAE-AISI 4150 is a low-alloy steel. 4150 is the SAE-AISI designation for this material. 1.7228 is the EN numeric designation. And G41500 is the UNS number. It has three common variants, each represented as a separate material. The material properties section shows ranges encompassing all variants. To see the details of each variant on a separate page, follow the links in the Variant Materials section further below.

Mechanical Properties

Graph bars compare SAE-AISI 4150 to other materials. From top to bottom: low-alloy steel, iron alloys, and the entire database.

Brinell Hardness

200 to 380

Elastic (Young's, Tensile) Modulus

210 GPa 31 x 106 psi

Elongation at Break

12 to 20 %

Modulus of Resilience (Unit Resilience)

340 to 3510 kJ/m3

Poisson's Ratio

0.29

Strength to Weight Ratio

93 to 170 kN-m/kg

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

Unit Rupture Work (Ultimate Resilience)

120 to 180 MJ/m3

Thermal Properties

Specific Heat Capacity

450 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

42 W/m-K 24 BTU/h-ft-°F

Thermal Diffusivity

12 m2/s

Thermal Expansion

12 µm/m-K

Other Material Properties

Base Metal Price

4.0 % 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

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

Variant Materials

Similar Alloys

Further Reading

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

Ferrous Materials: Steel and Cast Iron, Hans Berns and Werner Theisen, 2008

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