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SAE-AISI S1 Steel vs. SAE-AISI 4340M Steel

Both SAE-AISI S1 steel and SAE-AISI 4340M steel are iron alloys. They have a very high 97% of their average alloy composition in common. There are 24 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI S1 steel and the bottom bar is SAE-AISI 4340M steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 73
72
Tensile Strength: Ultimate (UTS), MPa 690 to 1840
2340

Thermal Properties

Latent Heat of Fusion, J/g 260
280
Melting Completion (Liquidus), °C 1500
1440
Melting Onset (Solidus), °C 1450
1400
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 41
38
Thermal Expansion, µm/m-K 12
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.7
7.8
Electrical Conductivity: Equal Weight (Specific), % IACS 8.7
9.1

Otherwise Unclassified Properties

Base Metal Price, % relative 8.0
3.9
Density, g/cm3 8.0
7.8
Embodied Carbon, kg CO2/kg material 2.6
1.9
Embodied Energy, MJ/kg 37
26
Embodied Water, L/kg 56
55

Common Calculations

PREN (Pitting Resistance) 5.9
2.2
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 24 to 64
84
Strength to Weight: Bending, points 22 to 42
51
Thermal Diffusivity, mm2/s 11
10
Thermal Shock Resistance, points 21 to 56
70

Alloy Composition

Carbon (C), % 0.4 to 0.55
0.38 to 0.43
Chromium (Cr), % 1.0 to 1.8
0.7 to 1.0
Copper (Cu), % 0 to 0.25
0
Iron (Fe), % 91.6 to 96.7
93.3 to 94.8
Manganese (Mn), % 0.1 to 0.4
0.65 to 0.9
Molybdenum (Mo), % 0 to 0.5
0.35 to 0.45
Nickel (Ni), % 0 to 0.3
1.7 to 2.0
Phosphorus (P), % 0 to 0.030
0 to 0.012
Silicon (Si), % 0.15 to 1.2
1.5 to 1.8
Sulfur (S), % 0 to 0.030
0 to 0.012
Tungsten (W), % 1.5 to 3.0
0
Vanadium (V), % 0.15 to 0.3
0.050 to 0.1