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SAE-AISI 1078 Steel vs. S40930 Stainless Steel

Both SAE-AISI 1078 steel and S40930 stainless steel are iron alloys. They have 88% of their average alloy composition in common. There are 31 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.

For each property being compared, the top bar is SAE-AISI 1078 steel and the bottom bar is S40930 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220 to 230
160
Elastic (Young's, Tensile) Modulus, GPa 190
190
Elongation at Break, % 11 to 14
23
Fatigue Strength, MPa 270 to 350
130
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
75
Shear Strength, MPa 440 to 470
270
Tensile Strength: Ultimate (UTS), MPa 730 to 780
430
Tensile Strength: Yield (Proof), MPa 430 to 570
190

Thermal Properties

Latent Heat of Fusion, J/g 250
270
Maximum Temperature: Mechanical, °C 400
710
Melting Completion (Liquidus), °C 1460
1450
Melting Onset (Solidus), °C 1420
1410
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 49
25
Thermal Expansion, µm/m-K 11
10

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
2.9
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
3.3

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
8.5
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
2.3
Embodied Energy, MJ/kg 18
32
Embodied Water, L/kg 45
94

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 90
80
Resilience: Unit (Modulus of Resilience), kJ/m3 490 to 860
94
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 26 to 28
16
Strength to Weight: Bending, points 23 to 24
16
Thermal Diffusivity, mm2/s 13
6.7
Thermal Shock Resistance, points 25 to 26
16

Alloy Composition

Carbon (C), % 0.72 to 0.85
0 to 0.030
Chromium (Cr), % 0
10.5 to 11.7
Iron (Fe), % 98.5 to 99
84.7 to 89.4
Manganese (Mn), % 0.3 to 0.6
0 to 1.0
Nickel (Ni), % 0
0 to 0.5
Niobium (Nb), % 0
0.080 to 0.75
Nitrogen (N), % 0
0 to 0.030
Phosphorus (P), % 0 to 0.040
0 to 0.040
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0 to 0.050
0 to 0.020
Titanium (Ti), % 0
0.050 to 0.2