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

SAE-AISI 4150 is an alloy of iron, further classified as 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.

Material Properties

Base Metal Price4.0 % rel

Density7.8 g/cm3 (490 lb/ft3)

Elastic (Young's, Tensile) Modulus210 GPa (30 x 106 psi)

Elongation at Break12 to 20 %

Poisson's Ratio0.29

Specific Heat Capacity450 J/kg-K

Strength to Weight Ratio94 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)

Thermal Conductivity42 W/m-K

Thermal Diffusivity12

Thermal Expansion12 µm/m-K

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 %

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