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SAE-AISI 1078 Steel vs. S31655 Stainless Steel

Both SAE-AISI 1078 steel and S31655 stainless steel are iron alloys. They have 68% 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 S31655 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 220 to 230
210
Elastic (Young's, Tensile) Modulus, GPa 190
200
Elongation at Break, % 11 to 14
39
Fatigue Strength, MPa 270 to 350
300
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 72
78
Shear Strength, MPa 440 to 470
490
Tensile Strength: Ultimate (UTS), MPa 730 to 780
710
Tensile Strength: Yield (Proof), MPa 430 to 570
350

Thermal Properties

Latent Heat of Fusion, J/g 250
290
Maximum Temperature: Mechanical, °C 400
1010
Melting Completion (Liquidus), °C 1460
1430
Melting Onset (Solidus), °C 1420
1380
Specific Heat Capacity, J/kg-K 470
480
Thermal Conductivity, W/m-K 49
15
Thermal Expansion, µm/m-K 11
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.0
2.4
Electrical Conductivity: Equal Weight (Specific), % IACS 8.1
2.7

Otherwise Unclassified Properties

Base Metal Price, % relative 1.8
17
Density, g/cm3 7.8
7.8
Embodied Carbon, kg CO2/kg material 1.4
3.3
Embodied Energy, MJ/kg 18
46
Embodied Water, L/kg 45
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 90
230
Resilience: Unit (Modulus of Resilience), kJ/m3 490 to 860
310
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
25
Strength to Weight: Axial, points 26 to 28
25
Strength to Weight: Bending, points 23 to 24
23
Thermal Diffusivity, mm2/s 13
4.0
Thermal Shock Resistance, points 25 to 26
16

Alloy Composition

Carbon (C), % 0.72 to 0.85
0 to 0.030
Chromium (Cr), % 0
19.5 to 21.5
Copper (Cu), % 0
0 to 1.0
Iron (Fe), % 98.5 to 99
63.2 to 71.9
Manganese (Mn), % 0.3 to 0.6
0 to 2.0
Molybdenum (Mo), % 0
0.5 to 1.5
Nickel (Ni), % 0
8.0 to 9.5
Nitrogen (N), % 0
0.14 to 0.25
Phosphorus (P), % 0 to 0.040
0 to 0.045
Silicon (Si), % 0
0 to 1.0
Sulfur (S), % 0 to 0.050
0 to 0.015