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SAE-AISI 4150 Steel vs. ASTM A372 Grade M Steel

Both SAE-AISI 4150 steel and ASTM A372 grade M steel are iron alloys. They have a very high 96% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (1, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 4150 steel and the bottom bar is ASTM A372 grade M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 200 to 380
240 to 280
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 12 to 20
18 to 21
Fatigue Strength, MPa 260 to 780
450 to 520
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
73
Shear Strength, MPa 410 to 800
510 to 570
Tensile Strength: Ultimate (UTS), MPa 660 to 1310
810 to 910
Tensile Strength: Yield (Proof), MPa 380 to 1220
660 to 770

Thermal Properties

Latent Heat of Fusion, J/g 250
250
Maximum Temperature: Mechanical, °C 420
450
Melting Completion (Liquidus), °C 1460
1460
Melting Onset (Solidus), °C 1420
1420
Specific Heat Capacity, J/kg-K 470
470
Thermal Conductivity, W/m-K 42
46
Thermal Expansion, µm/m-K 13
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
8.0
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 2.4
5.0
Density, g/cm3 7.8
7.9
Embodied Carbon, kg CO2/kg material 1.5
2.0
Embodied Energy, MJ/kg 20
27
Embodied Water, L/kg 51
61

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 82 to 180
160
Resilience: Unit (Modulus of Resilience), kJ/m3 380 to 3930
1140 to 1580
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
24
Strength to Weight: Axial, points 24 to 47
29 to 32
Strength to Weight: Bending, points 22 to 34
24 to 27
Thermal Diffusivity, mm2/s 11
12
Thermal Shock Resistance, points 19 to 39
24 to 27

Alloy Composition

Carbon (C), % 0.48 to 0.53
0 to 0.23
Chromium (Cr), % 0.8 to 1.1
1.5 to 2.0
Iron (Fe), % 96.7 to 97.7
92.5 to 95.1
Manganese (Mn), % 0.75 to 1.0
0.2 to 0.4
Molybdenum (Mo), % 0.15 to 0.25
0.4 to 0.6
Nickel (Ni), % 0
2.8 to 3.9
Phosphorus (P), % 0 to 0.035
0 to 0.015
Silicon (Si), % 0.15 to 0.35
0 to 0.3
Sulfur (S), % 0 to 0.040
0 to 0.010
Vanadium (V), % 0
0 to 0.080