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SAE-AISI M48 Steel vs. SAE-AISI 4140 Steel

Both SAE-AISI M48 steel and SAE-AISI 4140 steel are iron alloys. They have 69% of their average alloy composition in common. There are 19 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI M48 steel and the bottom bar is SAE-AISI 4140 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 78
73
Tensile Strength: Ultimate (UTS), MPa 890 to 2390
690 to 1080

Thermal Properties

Latent Heat of Fusion, J/g 260
250
Melting Completion (Liquidus), °C 1670
1460
Melting Onset (Solidus), °C 1620
1420
Specific Heat Capacity, J/kg-K 420
470
Thermal Expansion, µm/m-K 12
13

Otherwise Unclassified Properties

Base Metal Price, % relative 48
2.4
Density, g/cm3 8.7
7.8
Embodied Carbon, kg CO2/kg material 13
1.5
Embodied Energy, MJ/kg 190
20
Embodied Water, L/kg 160
51

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 22
24
Strength to Weight: Axial, points 28 to 76
25 to 38
Strength to Weight: Bending, points 23 to 45
22 to 30
Thermal Shock Resistance, points 26 to 71
20 to 32

Alloy Composition

Carbon (C), % 1.4 to 1.5
0.38 to 0.43
Chromium (Cr), % 3.5 to 4.0
0.8 to 1.1
Cobalt (Co), % 8.0 to 10
0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 63.8 to 69.8
96.8 to 97.8
Manganese (Mn), % 0.15 to 0.4
0.75 to 1.0
Molybdenum (Mo), % 4.8 to 5.5
0.15 to 0.25
Nickel (Ni), % 0 to 0.3
0
Phosphorus (P), % 0 to 0.030
0 to 0.035
Silicon (Si), % 0.15 to 0.4
0.15 to 0.35
Sulfur (S), % 0 to 0.030
0 to 0.040
Tungsten (W), % 9.5 to 10.5
0
Vanadium (V), % 2.8 to 3.3
0

Comparable Variants